New doubles and other notes reported to Brian Mason starting 2009 Feb 4 From: Brian Skiff To: bdm@usno.navy.mil Subject: Common-motion companion to HD 37106 [Skf 17] Date: Wed, 04 Feb 2009 14:19:26 -0700 Apparently it has not been noticed that HD 37106 has a common-proper-motion companion. The primary star is WDS 05334-4923 = HDS 732, which appears to be unconfirmed. However, about 33" NW is CF 1794 = UCAC2 10561599, which has nearly the same (substantial) motion as the HD star. The old "Cape Faint" catalogue shows it with spectral type G0, which is probably too early. The 2MASS J-K = 0.60, suggesting a mid-K dwarf. Assuming the connection is correct, we also have a parallax for one more star since the HD star is in Hipparcos. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, nz@usno.navy.mil Subject: CD-46 644 cpm companion [Skf 18] Date: Sun, 08 Feb 2009 14:58:46 -0700 Going through another paper with spectral types, I notice that CD-46 644 seems to have a common-motion companion in UCAC2. The two stars are UCAC2 11911539 (primary) and 11911537. The primary is a strong x-ray source and has a spectral type (K3IVe) and other data from from Torres et al 2006A&A...460..695T. The secondary has very similar (not identical but within errors) motion in UCAC2 and USNO-B1.0. The 2MASS J-K color is that of a late-M dwarf, consistent with the delta-mag implied by the various visible-light catalogues. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, nz@usno.navy.mil Subject: CPD-73 219 cpm companion [Skf 19] Date: Sun, 08 Feb 2009 17:58:13 -0700 Another pair similar to the one sent earlier today. This pair involves CPD-73 219, another active x-ray source, and an M dwarf companion about 30" NE. The stars are UCAC2 01083923 and 01083926. Torres et al (2006A&A...460..695T) give type K0IV for the primary, and mark it as a double-lined binary. Indeed the ASAS-3 lightcurve shows what's obviously an eclipsing binary (it is NSV 1174). The secondary has 2MASS J-K = 0.87, typical of early/mid-M dwarfs. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, nz@usno.navy.mil Subject: Cri 23, an M-dwarf/white-dwarf pair ? Date: Tue, 10 Feb 2009 19:59:24 -0700 Another interesting pair from the Torres et al survey. This is Cri 23 = WDS 19371-5134 at: 19 37 08.70 -51 34 00.7 (J2000). Though it is catalogued in the WDS and shown in UCAC2 with common proper motion, it apparently has not been noticed that the secondary star is very blue, suggesting it is an M-dwarf/white-dwarf binary. The M-dwarf primary has an Hipparcos parallax. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: LDS 803 pa error Date: Tue, 10 Feb 2009 22:27:07 -0700 The WDS (actually B/wds in VizieR) currently shows the position angle for this pair as 292 deg for the year 1958. However later DSS and 2MASS images suggest this must be a typo, perhaps for pa 252. The note for this star says "spectral type K0?" This possibly derives from the Cape Photographic Catalogue, where non-HD star types for this particular zone were determined by Dorrit Hoffleit. In any case, this seems to be okay, since Torres et al (2006A&A...460..695T) give K0IV for the brighter component, and in fact say it is a double-lined binary. They did not observe the companion, despite its being closer to the RSX x-ray source position. From: Brian Skiff To: Brian D. Mason Subject: Re: LDS 803 Date: Tue, 03 Mar 2009 12:42:01 -0700 Just looked again at B/wds to see that there are indeed the two Luyten measurements with the strong change in position angle. I guess you'd want to examine the Bruce survey plates again to see what is going on. Perhaps those will get scanned eventually as part of the Harvard project. In any case, I agree it's not time to change the WDS yet, though the figures shown aren't where the companion is at present. In general I try to find where errors come from, but should have been specific that this wasn't a WDS typo, but a goof on Luyten's part. From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 23150-6334 = LDS 803 additional obs Date: Sun, 20 Feb 2011 11:37:28 -0700 This one still needs some attention. The 1958 position-angle in the WDS appears to have a typo. Presumably the 1920 pa is "south-preceding". theta rho epoch source 248.8 25.16 1978.577 GSC-ACT 248.1 24.61 1980.911 GSC-ACT 248.5 24.85 1992.9 Bauer et al, 2007PASA...24..118B 248.3 24.80 2000.613 DENIS 248.1 25.07 2000.758 2MASS The tables from the Bauer et al paper are in VizieR. Spectral types are given as: K0IV for the primary by Torres 2006A&A...460..695T, who also say it is a double-line spectroscopic binary; and M2e for the companion by Riaz 2006AJ....132..866R. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, francois@vizir.u-strasbg.fr Subject: LDS 164 separation error in B/wds Date: Sun, 15 Feb 2009 19:07:46 -0700 I notice that the separation shown in B/wds for the pair LDS 164 = HD 46435 should be 91" (or 92") rather than 9".0. It seems to be shown correctly in the 1996 WDS version (I/237) as 91".0 with the position angle as 'sf' (south-following). The UCAC2 shows 92".4 separation in pa 151.4 deg for epoch 2000; the proper motions are similar but not really close. It's possible the uncertainties on the motion of the fainter star are underestimated. The 2MASS J-K = 0.78, suggesting a late-K dwarf, which is consistent with the Houk spectral type for the primary (G3/5V) and the delta-magnitude. Since this is the second such example I have found for wide LDS pairs, I wonder if there is some generic problem for these stars. The copy at USNO-DC also shows the error, so the problem is evidently not in the file supplied for VizieR. From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 06303-5252 = LDS 164 additional obs Date: Sun, 20 Feb 2011 12:48:47 -0700 Some modern observations with accurate position-angles: theta rho epoch source 151.6 91.97 1977.045 GSC-ACT 151.6 92.10 1979.884 GSC-ACT 151.4 92.92 1988.070 GSC-ACT 151.4 92.30 1999.904 2MASS 151.4 92.42 2000.0 UCAC2 151.4 92.41 2000.026 DENIS, n=2 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: PLQ 35 and alternate companion [Skf 20] Date: Thu, 26 Feb 2009 21:57:36 -0700 This pair PLQ 35 = WDS 02444+1057 is readily linked with Vyssotsky M-dwarf 401 = MCC 401 in SIMBAD, which is an x-ray source. The WDS companion specifies the star about 20" NW as the secondary. Since the primary is a K5/M0 dwarf, the star NW has no relation to it by colors and proper motion. However, I notice that the star a similar distance SE is a mid-M dwarf according to Fleming et al 1988ApJ...331..958F, consistent with 2MASS colors, and it seems likely that the two M dwarfs are related. The only proper motion available to me for the fainter star SE is from USNO-B1.0, but it seems to include a 20th magnitude "something" in the vicinity, and is thus unreliable. Perhaps you can do better in linking the two stars astrometrically. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, question@simbad.u-strasbg.fr, dubois@simbad.u-strasbg.fr, george.mccook@villanova/edu Subject: Coords etc for LDS 856 = L151-81 Date: Fri, 27 Feb 2009 14:19:36 -0700 The Luyten position for this pair, adopted both in the WDS and SIMBAD, is in error by about an arcminute. One of the four entries for the star in SIMBAD also has an erroneous 2MASS designation. The position is also wrong in the Villanova WD catalogue. None of the recent astrometric catalogues contains the pair, including 2MASS, where the stars are too hot/faint to be present. The best we can do is USNO-A2.0 or the position from the HST log, the latter which I'm adopting for the moment based on the position using SkyView DSS images. There are nearby entries in various catalogues, but these seem to be photo-centers for merged images. For what it's worth, the USNO-B1.0 motion for the nearest object does not match Luyten's motion, though similar in magnitude. L 151-81 = USNO-A2.0 0225-21347494 14 58 11.97 -63 17 32.5 (J2000, HST exposure log) --- spectral types: DB3 + DA4 (1988ApJ...333L..87O); the DB3 component is evidently the western star of the pair In SIMBAD the name 2MASS J14581310-6317340 has been incorrectly attributed per 2006A&A...450..331C; they observed the right star, but as can be seen the 2MASS colors are for a red object east of the binary. So this biblio entry should be added to L 151-81, and the 2MASS name deleted (perhaps with a note saying it is wrong). There are also SIMBAD entries for the two stars separately, and these should have coordinates improved, perhaps by using the above position rounded to 1s/0'.1 or something. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HEG 1 = PG 1115+080 (quasar) Date: Wed, 11 Mar 2009 12:31:45 -0700 Here's a case that I wonder whether it is appropriate for the WDS! The object reported is evidently a lensed quasar. A look at the very nice SDSS images suggests there are at least two components readily visible within 2".5 radius (one is west, another northwest) in addition to the one measured by Hege et al. The Sloan images in all five colors suggest the brightest component is somewhat oval with position angle ~60 deg, so perhaps this is the thing Hege et al observed. I assume that all these are peaks of the caustic of the lensed system, but perhaps there are foreground galaxies involved, too. Anyway, with z = 1.7 this entry probably at least needs a note to say it's not a Galactic binary star. The Sloan-derived V magnitude for the primary is 16.1. The VizieR listing also shows various HST images and spectra, so perhaps you could look at much higher angular resolution. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords for WDS 08469+1753 Date: Tue, 31 Mar 2009 23:00:00 -0700 This is Cud 4, the central star of the planetary nebula Abell 30. The WDS position is slightly off, and should be: 8 46 53.47 +17 52 46.3 (J2000, UCAC2) ...for the primary. Both stars appear the Carlsberg meridian circle CMC14 catalogue and SDSS DR6, so there's at least those additional astrometric observations. Interestingly, the supposed galaxy cluster ClG 0844+18 is also shown at this position in SIMBAD. I wonder if someone's software picked up the clumpiness of the nebula (even very close to the central star) as a galaxy cluster? =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords for WDS 12599+0432 Date: Tue, 31 Mar 2009 23:24:00 -0700 This is LDS 4304, which probably has a semi-accurate position in the WDS. It's a little bit wonky in USNO-B1.0, and the primary is possibly overexposed in SDSS, but the latter at least gets you pretty close: LDS 4304 A: 12 59 50.35 +04 31 26.2 LDS 4304 B: 12 59 50.85 +04 31 31.6 The common proper motion is clear from comparison of the POSS-I and POSS-II plate-scans (or SDSS), so the proper motions shown in both USNO-B1.0 and SDSS are off. A nice white-dwarf/M-dwarf pair in any case. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 01002+5809 components [Skf 56 BC] Date: Fri, 24 Apr 2009 14:40:41 -0700 While trying to parse out the components of this pair, I notice that Stein 1507 refers to an optical pair involved in a small group, but that the nominal secondary of that pair has common motion with the brighter BD (and HDE) star to its east, which doesn't seem to be part of the package in the WDS. If you compare simply by eye the DSS1 with any if the recent sky survey images you can spot the motion-pair right away---notice the change in pa for the fainter component of the Stein pair, and its motion parallel to the BD star. The moving pair is passing near three similarly-bright stars at present. Thus I wonder if it's worth noting what seems to be a physical pair involving HD 236596 = BD+57 178: A comp: HD 236596 = BD+57 178 = TYC 3680-0652-1 (etc) 1 00 15.80 +58 09 14.3 (J2000, Tycho-2) B comp: GSC 3680-0596 = 2MASS J01001306+5809125 = AC2000 1718659 1 00 13.07 +58 09 12.5 (J2000, 2MASS) The motion of the secondary is not given correctly by USNO-B1.0, but is okay in NOMAD and some of the Russian compilation catalogues shown by VizieR. The AC link should let you find the secondary in your files as well....VizieR shows some entries from the Wycoff et al list (2006AJ....132...50W). The HDE type (F2) seems to be good for the primary. It is also given as G0p in the McCormick catalogue (1956PMcCO..13a....B), with the peculiarity probably explained by the overlapping spectra on the objective-prism plates. There is an IRAS faint-source 'reject' 12-micron detection here that seems to be associated with the primary of Stein 1507, whose 2MASS J-K color is that of an (unreddened) mid/late-K giant. It and the other two fainter components are probably in the background of the motion pair. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, jack@stsci.edu Subject: VES 412 is a double [Skf 57] Date: Mon, 04 May 2009 23:21:13 -0700 Going over the Vatican list of emission-line stars, I notice that this star seems to be a common-motion pair. The Tycho-2 motion for the primary appears to be roughly correct (I first thought it resulted from the companion giving spurious motion in earlier-epoch coords). It is easy to see the motion relative to background stars by comparing DSS1 red/blue with any of the newer plate-scans or 2MASS. VES 412 = TYC 3602-0851-1 = AC2000 1655629 = 2MASS J21293296+5111187 21 29 32.96 +51 11 18.7 (J2000, 2MASS) --- coords are for primary --- comp = 2MASS J21293258+5111160: 21 29 32.59 +51 11 16.0 (2MASS) ...about 4".5 SW --- combined V = 10.8 (TASS MkIV); delta-J = 1.5 from 2MASS, so presumably larger than this in the visible, perhaps ~2.0 estimated from DSS scans --- modest motion plus V-I and 2MASS colors are consistent with the pair being K dwarfs (maybe close to M0 for the fainter star) --- though included in the survey reporting H-alpha emission (1976VatOP...1..245W), the follow-up by MacConnell and Coyne (1983VatOP...2...63M) lists it as being unconfirmed, thus _no_ H-alpha emission in this pair (it hasn't shown up in any other emission-line surveys either) For Jack: I'm making a pass through the VES stars to bring the list up to my current standards and to add them to my big file. I'll add a column just to flag the "no H-alpha" stars in hopes that the CDS folks will finally clean things up in SIMBAD. From: Brian Skiff To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: Re: VES 412 is a double (addendum) Date: Mon, 04 May 2009 23:25:18 -0700 Just noticed that SIMBAD shows UBV data from 1972A&AS....7..385S: V = 10.88 B-V = 0.99 U-B = 0.70 (n=3) ...again consistent with the early+late-K dwarf idea. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 43162 and cpm companion [Skf 58] (also distant comp) Date: Tue, 19 May 2009 00:10:38 -0700 Looks as though this pair hasn't been linked explicitly yet. The brighter star has well-determined motion and parallax from the Hipparcos/Tycho series. The fainter companion is about 24" due south, assigned type M4Ve in 2003IBVS.5447....1C, where the link with the brighter star is implicit. Likewise type M3.5 from 2006AJ....132..866R, where again the connection with the bright companion seems to have been overlooked. I noticed the common motion by comparing DSS1-blue with 2MASS, but NOMAD seems to show the motion for the faint star about right, and similar to the motion for the bright star adopted from HIP/Tyc2. The delta-mags are consistent with the difference in spectral type. [later follow-up] From: Brian Skiff Reply-To: bas@lowell.edu To: thenry@chara.gsu.edu Subject: HD 43162 second companion Date: Sun, 06 Mar 2011 14:03:38 -0700 Howdy Todd. I've been going over my double-star finds to prepare for them publication. I notice that your gang seem to have identified the distant companion (170" south) to this ~17pc star, called Rag 5 AC (Raghavan) in the WDS. Although present implicitly in SIMBAD and VizieR, I have made an explicit link with another star only 25" south, now called Skf 58 in the WDS. It clearly has common motion, and at least two published spectral types (about M4Ve in 2003IBVS.5447....1C and M3.5 in 2006AJ....132..866R), similar in brightness or type from the distant companion. Since the primary is so bright, it's the sort of thing that you wouldn't pick up from Schmidt plate-scans. The literature is also a little fuzzy in recording the star but there's no obvious link to the primary. Available relative astrometry via VizieR: theta rho epoch source 177.2 24.87 1976.91 Rousseau 176.7 24.44 1999.033 2MASS 176.5 24.55 2000.0 UCAC3 The UCAC3 observation is probably good enough even though it omits Hipparcos/Tycho and AC2000 --- one of the many problems with this catalogue. Anyway, if this one hasn't been included in your GJ revision, you might want to flag it. HD 43162 is at: 6 13 45.3 -23 51 43 (J2000). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-30 13795 as a triple (not in WDS yet) Date: Sun, 31 May 2009 15:49:30 -0700 Here's a fun one for your next O-stars speckle run. The emission-line star CD-30 13795 = LS 3926 appears to be triple on 2MASS images. The "outer" third component is shown in the 2MASS at about 5" SW, with the second brighter component in between that and the primary. These are both a few magnitudes fainter than the primary. The brightest star is centered at: 17 06 36.71 -30 12 32.7 (J2000, UCAC2). The star is called type B0:e in the old Mt Wilson catalogue (1949ApJ...110..387M), and also B0 in the relevant Yale zone catalogue (1943TOYal..13B....S), where the type was determined by either Cannon or Mayall. It's possible the MWC temperature type was taken from the latter. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: ARA 730 etc coords ? Date: Thu, 04 Jun 2009 18:33:21 -0700 I am wondering whether the coordinates for the group involving ARA 730 = WDS 18081-1925 are for the wrong primary star. Have a look at images for the nominal position (18 02 03 -19 23.7 for J2000), and notice the tight knot about an arcminute southeast. There seem to be at least seven components involved there, whereas the isolated star at the nominal place doesn't seem to have anything obvious around it, even for the folks trawling for pairs in the AC. The specs for the three brightest stars in the knot are close to what's reported in the WDS. The "correct" primary star is at: 18 08 07.69 -19 24 39.1 (J2000, UCAC2), and this is the early-type emission-line star LS 4681 = Hen 3-1596 = AS 277. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords error for Es 2502 Date: Fri, 05 Jun 2009 20:09:10 -0700 The coordinates for this pair (WDS 20176+3806) are for the wrong star. The star given is single. The pair is instead a neighbor just east: Es 2502 A = UCAC2 45227511: 20 17 33.71 +38 06 03.0 (J2000, UCAC2) The secondary is well shown in 2MASS, CMC14, etc. As is typical for the Espin pairs, the magnitudes are quite a bit too bright. CMC14 gives Sloan r' of 12.2 and 12.7 for the two stars, so the V magnitudes will be close to 12.5 and 13. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, jack@stsci.edu Subject: HD 63554 is a wide pair [Skf 63] Date: Thu, 25 Jun 2009 13:23:22 -0700 I suppose there are thousands like this, but I'm still surprised when a relatively bright semi-wide pair doesn't show up in the WDS. The bluer/brighter component to the SW has H-alpha emission reported by Jack MacConnell (whose 1981 list I'm going over). He specifies it as a double and the blue component as having the emission, so if there's credit/blame to be apportioned, it's to him. Nancy Houk called this B8II, so the redder star ~9" NE (colors are of a K giant) is not ruled out obviously as an optical companion; proper motions are similar but small enough to be equivocal. The primary is at: HD 63554: 7 49 11.48 -10 20 00.3 (J2000, UCAC2) The components are wide enough to appear separately in several catalogues. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: [M81] I-254 as a triple [Skf 64] Date: Fri, 26 Jun 2009 14:36:21 -0700 Finding all these minor funnies in the WDS is lots easier now with it being at VizieR. I now include it in my regular searches as I compile new lists. Here's another interesting one from Jack MacConnell's H-alpha emission list. His object [M81] I-254 appears to be a ~4" roughly- equal pair on the visible-light DSS images, but the 2MASS images show a third component that comes up at longer wavelengths, though that component doesn't have its own entry in 2MASS. Given the location projected on a dark cloud and the ROSAT detection, it's most likely a T Tauri-type system. Mid-point of the two 2MASS entries is: 8 44 11.1 -41 16 19 (J2000). There is photometry of the trio as a single object, which shows V = 12.00, B-V 0.80, U-B = 0.28. This is from 1973A&AS....9...97M, where it is given as star 14 in the cluster (or star-group) Collinder 197. ASAS-3 is consistent: V = 11.97 +/- 0.04 from 600+ observations. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 303917 as a pair [Skf 180] Date: Sat, 27 Jun 2009 12:33:08 -0700 Not sure that there's anything to be done with this one without additional observations. This star has slightly discordant positions in 2MASS versus "other", while it is omitted altogether from UCAC2 (where it ought to appear if uncrowded). The DSS1 short-V plate-scan shows that it is a roughly-equal double, as do the DSS2 red and far-red plates. The 2MASS images concentrate on the southeastern component. The HDE gives type B5 and the Stockholm survey called it B2/5:, noting it as double. The companion referred to is possibly the more distant fainter one about 10" SE. MacConnell found H-alpha emission. The older AC2000 and Fresneau's scans of the Sydney plates suggest the NW component must be the blue one; separation is ~2", so it's only oval on the various images. This might be a zeta Aur-type binary (mid-B dwarf + K supergiant), but of course "more data are required". Mid-point position is: 11 10 44.8 -59 02 54 (J2000). Principal aliases are: HD 303917 = CD-58 3888 = CPD-58 3241 = TYC 8628-1274-1. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 16329-4656 = CPO 480 is triple (third comp not in WDS) Date: Sat, 27 Jun 2009 19:53:06 -0700 The 2MASS images of this object show that the primary is a clos(er) pair, hinted at on the less-exposed visible-light DSS scans, but obvious in the 2MASS images. The 2MASS coords seem to be for the northern of 'Aa' pair (pa 0/180), while Tycho-2 and UCAC2 seem to be for the southern star, like so: northern: 16 32 57.30 -46 56 16.6 southern: 16 32 57.30 -46 56 18.8 Taken at face value, the uncertain 2MASS photometry indicates the northern component is quite red, while the Tycho-2 photometry shows the southern star to be blue and must correspond to the Houk B9V type. They're nearly equally-bright at J, but the blue star is fainter at K. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 18293-0459 = J 522 mags, delta-m Date: Sun, 28 Jun 2009 12:52:37 -0700 Both ASAS-3 and TASS MkIV agree in giving this pair a combined V mag of 11.1 (formally ASAS-3: 11.08 +/- 0.03, and TASS: 11.05 +/- 0.11). Also it seems the delta-mag is closer to 1.0 rather than 1.9 per the WDS. Schalen's old spectral type of 'F' (1935MeUpp..61....1S) seems to be consistent with the 2MASS colors if the pair is a bit reddened--- unsurprising given its location in the Scutum starcloud. MacConnell finds the pair to have H-alpha emission, but this could result simply from the overlapping spectra on the objective-prism plates. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 04039+2808 = VBS 9 trivium Date: Mon, 13 Jul 2009 00:08:44 -0700 I happened to notice that the ~1" companion to this star is mentioned by Alfred Joy in 1942PASP...54...35J, where he describes the spectrum of the eclipsing binary (primary). It was noted visually in Sep 1941 using the 100-inch at Mount Wilson during mid-eclipse. Only estimates of the magnitude, separation, and pa are given. The WDS shows that evidently vanB got around to measuring it properly only in 1959. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: V973 Cas is triple [Skf 213] Date: Sun, 19 Jul 2009 12:07:55 -0700 This is another merely "curious" case that needs more astrometric observation. It is evidently triple on DSS and 2MASS images. The 2MASS position, presumably for the brightest southeastern component at near-IR wavelengths, is: 1 45 37.81 +61 07 59.1 (J2000). The star lies in NGC 663 and is recorded in several instances as a Be-type star with combined V = 12.1. By being a likely member of the open cluster perhaps it is less interesting as a multiple star. The much fainter companion ~11" SE is also a ~2" pair. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 05306+1237 = CHN 11 early pa? Date: Sun, 19 Jul 2009 22:42:34 -0700 I notice that the POSS-I scans of this T Tau-type pair look rather similar to later images (up to 2MASS). Yet the nominal 1976 observation has pa 340. Could there be a typo such that for 340 deg ---> 34 deg intended? Or maybe a decimal point dropped? The 34 deg angle is correct. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 18107-1624 = FEN 27 mis-ID ? Date: Fri, 24 Jul 2009 21:15:14 -0700 This pair seems to be linked incorrectly in the WDS with BD-16 4738. The TDSC seems to show this also. The correct location is about an arcminute NE. 2MASS shows both components with mid-position: FEN 27: 18 10 41.2 -16 23 21 (J2000) UCAC2 seems to be showing a weighted photo-center not far from this position. ASAS-3 shows a combined brightness of V = 11.4, and they look very nearly equal from the blue to the near-IR. AC2000.2 has them separately, though it seems the measurement of the NE component might be mixed partly with the other star. The Carlsberg meridian circle catalogue also shows them resolved. Irina Pronik (1958IzKry..20..208P) gives spectral type A0 for the combined light, which is consistent with the somewhat uncertain 2MASS colors. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 21325+4436 BC = Pop 136 BC Date: Sat, 25 Jul 2009 15:26:54 -0700 The BC components of this group is the small planetary nebula IC 5117 = HD 205211. Coords etc are otherwise okay in the WDS. =============================================================================== From: Brian Skiff To: question@simbad.u-strsabg.fr, siebert@astro.u-strasbg.fr, dubois@astro.u-strasbg.fr Subject: BD+44 2120 components Date: Tue, 28 Jul 2009 16:59:20 -0700 This is a triple star (two are related) that have six entries in SIMBAD. As can be seen in DSS/2MASS images, there is a relatively close pair (~7"), likely with common motion, and a wider companion that is probably not related. The closer pair are blue and correspond to the A-type component of [SS59] I 173. The other single star is redder and has the colors of a K0 giant, and corresponds to the G-type component noted by Stelletbak & Stock. All three stars have UBV data in the Mermilliod compilation (II/168). Thus the way seems clear for SIMBAD, with perhaps an optional entry for the trio taken together and/or another just for the closer AB pair. The names for the components is consistent with the WDS. BD+44 2120: 11 43 46 +44 10.7 (mid-point of trio rounded to 0'.1) --- V = 10.1 (combined V mag of trio) BD+44 2120AB: 11 43 48.0 +44 10 43 (mid-point of pair) --- V = 10.6 (combined V mag of pair) BD+44 2120A = TYC 3016-0414-1 11 43 48.16 +44 10 46.4 (J2000, Tycho-2) --- V = 11.22, B-V = 0.44, U-B = -0.07 BD+44 2120B = CCDM J11438+4411B = TYC 3016-0414-2 11 43 47.90 +44 10 40.3 (J2000, Tycho-2) --- V = 11.47, B-V = 0.48, U-B = -0.08 BD+44 2120C = CCDM J11438+4411C = TYC 3016-0450-1 = UCAC2 46952770 11 43 44.05 +44 10 49.1 (J2000, UCAC2) --- V = 11.10, B-V = 1.00, U-B = 0.66 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BD+31 2339 new pair [Skf 65] Date: Tue, 28 Jul 2009 21:48:34 -0700 It looks as though this is an overlooked (likely) common-motion pair. Except for the recent R\"oser et al PMMX compilation catalogue the motions are not explicit, but the separation in the AC2000 seems the same as with 2MASS. The slightly brighter northern component is in Tycho-2 and UCAC2. The 2MASS colors shows that the stars are essentially identical in color. Slettebak & Stock gave type F2 for the pair, while Malmquist shows F0. The Stromgren color indices suggest the later type is more nearly correct at least for the combined light. It seems odd that the TDSC would skip an "easy" pair like this. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Common-motion companions to Hipparcos stars [Skf 59] Date: Sun, 02 Aug 2009 12:27:48 -0700 I know that there has been some effort to look for low-mass common-motion companions to Hipparcos stars. But as I recall these seem to be mainly around fairly faint stars using the various Schmidt survey plate-scans. I wonder if there's been a generic search like this (perhaps in-house at USNO) using UCACx. This morning's example is HD 94456, which has an "obvious" common-motion companion (an M dwarf taking the 2MASS colors at face value) about 34" NE: HD 94456 10 54 44.78 +36 45 31.7 -51.0 -39.9 (Tycho-2 motion) M dwf comp 10 54 47.21 +36 45 49.3 -56.5 -35.1 (UCAC2 motion) This one is the first resulting from going over the classic Slettebak and Stock north galactic pole A-stars catalogue (1959AAHam...5..105S). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BD+47 1931 cpm companion [Skf 60] Date: Sun, 02 Aug 2009 15:25:39 -0700 Another wide pair involving an A-type dwarf and K-dwarf common-motion companion about 34" distant: BD+47 1931: 12 09 19.97 +46 56 11.7 -28.6 +2.5 UCAC2 47536564: 12 09 18.05 +46 55 44.0 -28.6 +4.4 ...where the last two figures are UCAC2 motions in mas/year. The delta-mags in UCAC2 are about right for the mid-A and mid-K dwarf types (the latter implied by the 2MASS J-K = 0.64). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: J 1405 recovered ? Date: Fri, 14 Aug 2009 01:10:31 -0700 While working on an unrelated star-list, I noticed that WDS 21225-1825 = J 1405 doesn't seem to correspond to anything nearby on the sky. Jonckheere gives the location as "+40s, -1' de la BD-19 6082". If you take a sign error in the RA offset (i.e. 40s west of the BD star rather than east), you land dead on WDS 21216-1825 = ARA 502. This has similar but not exact specs (somewhat wider than J measured, but pa very close). The ASAS-3 database gives V = 11.22 +/- 0.03 for the combined light of this pair, so the correct magnitudes are in-between what Jonckheere and Aravamudan gave. The old AC2000 differential position seems to be pretty consistent with the Carlsberg and 2MASS differences within the modest errors of the AC despite ~2" of proper motion since ~1920, so it seems they're a physical pair. The 2MASS colors are those of mid-G dwarfs. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 311449 and companion [Skf 61] Date: Fri, 14 Aug 2009 13:56:39 -0700 Through an ID error in the Nesterov HDE catalogue (and also the Fabricius HD/Tyc2 cross-index), I notice that this star is a wide common-motion pair of A-type stars. The HDE star is incorrectly linked with the fainter component in the Nesterov and Fabricius lists. The uncommon blue color (for general field stars) and very similar motions makes the connection likely. HD 311449 = TYC 9203-0385-1 = UCAC2 01179537 8 53 16.94 -72 29 20.8 (J2000, UCAC2) --- V = 10.0 (ASAS-3, Tycho-2), 2MASS J-K = 0.06 --- HDE type 'A' is consistent with photometric colors companion is: CPD-72 752 = TYC 9203-0909-1 = UCAC2 01179541 --- about 43" NE --- V = 11.1 (ASAS-3), 2MASS J-K = 0.08 UCAC2 motions are: -6.6 +6.7 (primary) -6.0 +5.2 (secondary) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 311185 and CPD-65 1051 [Skf 62] Date: Mon, 17 Aug 2009 19:39:23 -0700 These guys look like another pretty good common-motion pair. HDE chart 155 seems to specify the southeastern component as HD 311185 (a bit ambiguous, but it is the slightly brighter one from blue to near-IR), and colors and motions are consistent with them being a physical pair. The HDE gives the type as G0, but the 2MASS J-K suggests mid-F is more nearly correct---the overlap probably gave Cannon trouble. HD 311185 = TYC 8939-1685-1 = UCAC2 02688027 8 54 44.01 -66 24 03.4 (J2000, UCAC2) CPD-65 1051 = TYC 8939-2110-1 = UCAC2 02688023 8 54 42.754 -66 23 34.5 (J2000, UCAC2) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 56784 is cpm pair [Skf 66] Date: Fri, 21 Aug 2009 20:56:53 -0700 This is another good common-motion pair, found while working over HD stars. The original HD type is 'G', while Houk gives a similarly uncertain type of F8/G2. UCAC2 shows significant and near-parallel motion for the 10" pair. Looks as though the astrometric record goes back to the AC. HD 56784 A = UCAC2 09414804: 7 15 50.15 -51 31 55.5 (J2000) HD 56784 B = UCAC2 09414801: 7 15 49.87 -51 32 05.1 ASAS-3 combined V = 10.17 +/- 0.03 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 58446 cpm companion? [Skf 67] Date: Sun, 23 Aug 2009 19:21:30 -0700 This star appears to have a common-motion companion per UCAC2 lying about 33" SW of the primary: HD 58446 = UCAC2 10571364 -5.9 +57.6 UCAC2 10571360 -4.1 +57.6 Despite the significant motion, the relative magnitudes versus 2MASS J-K colors don't quite jibe unless there's some complication in the system (i.e. not simply two stars). If evolved, the secondary is too faint, but if unevolved it is too bright. I see that UCAC3 has been parsed to extract what are doubtless a very large number of common-motion stars (10x WDS ?), so perhaps pairs such as the above have already been picked up wholesale in an automated fashion. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 62914 and companion [Skf 68] Date: Mon, 24 Aug 2009 15:29:50 -0700 Another cpm pair obvious in UCAC2. The delta-mag and Tyc2/2MASS colors are consistent with their being a physical pair as well. About 15" separation. HD 62914 = UCAC2 10343868 16.3 0.3 UCAC2 10343862 14.9 -1.9 =============================================================================== From: Brian Skiff To: question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr, dubois@newb6.u-strasbg.fr, bdm@usno.navy.mil Subject: HD 64574 and CPD-43 1881 [Skf 69] Date: Tue, 25 Aug 2009 13:28:02 -0700 This is one some thousands of low-numbered HD stars shown with only an approximate position in SIMBAD. It is a wide pair with small but apparently common proper motion. The stars are resolved in the CPD but have a single entry in the CD catalogue. The HD type is simply 'F' probably due to the overlap of the images, while Houk gives the type F0 with no luminosity class and with her quality code 4 (lowest or least certain). The northwestern component is significantly brighter in the blue, and is bluer in color, so I want to suggest the HD number be attributed to that star. The fainter star has delta-mag and colors consistent with mid/late F type. HD 64574 = CD-43 3684a = CPD-43 1880 = TYC 7658-1308-1 = UCAC2 12847662 7 52 36.47 -44 00 43.0 (J2000, UCAC2) --- UCAC2 motion: -9.6 +4.1 mas/year CD-43 3684b = CPD-43 1881 = TYC 7658-2232-1 = UCAC2 12847663 7 52 36.74 -44 01 02.2 (J2000, UCAC2) --- UCAC2 motion: -8.7 +4.3 mas/year =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 65057 and cpm companion [Skf 70] Date: Tue, 25 Aug 2009 14:49:04 -0700 Another HD star with a common-motion companion according to UCAC2 motions. delta-mag and 2MASS J-K color are consistent with the fainter star being a K dwarf (HD star is given as F6V by Houk). HD 65057 = UCAC2 11480220 -34.5 0.2 mas/year UCAC2 11480226 -33.8 0.2 mas/year =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 65985 and companion [Skf 71] Date: Tue, 25 Aug 2009 16:00:55 -0700 Can't tell much about this one apart from colors and proximity, though the Houk type for the primary (A1V) plus delta-mag and 2MASS J-K for the secondary are consistent with their being a physical pair (the fainter star is mid-F-ish per 2MASS colors). The companion is due south about 4". Some of the older astrometry for the brighter star is slightly skewed in Dec because of the unnoticed companion. Perhaps UCAC3 will resolve them and give motions. HD 65985 = UCAC2 10800093 2MASS J07591329-4859545 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 66040 and HD 66063 [Skf 72] Date: Tue, 25 Aug 2009 20:42:33 -0700 This is another odd one for you. The wide pair seems to have nearly identical common proper motion in UCAC2 (less close in Tycho-2), yet the spectral types don't match the delta-mags. I suppose such cases must happen by chance at least some of the time --- but those I do see are common mainly amongst stars of disparate brightness, so I have ignored those. But these are bright enough and far enough apart that you wouldn't expect systematic funnies from the source catalogues. The HIP parallax for the K0V (HD 66040) seems to be reasonable (i.e. it is not a giant), and there's no reason to doubt the type for the hotter star. HD 66040 -22.6 +4.0 mas/year HD 66063 -22.2 +3.8 mas/year =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 66361 and HD 66362 [Skf 73] Date: Tue, 25 Aug 2009 22:06:29 -0700 These are an overlooked wide pair with near-parallel motion where the spectral types are consistent with their being physical. I note that the Tycho-2 motions are close while in UCAC2 they are somewhat different. UCAC2 Tycho-2 HD 66361 -9.1 5.9 -12.3 6.0 mas/year HD 66362 -12.2 4.1 -12.7 4.0 mas/year No radial velocities are shown in a VizieR search. Perhaps UCAC3 will give motions with smaller uncertainties. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 66745 is triple [Skf 74 etc] Date: Wed, 26 Aug 2009 14:04:46 -0700 I noticed that this pair (WDS 08032-4320 = CPO 188) changes appearance markedly between the regular blue-light DSS image and 2MASS J. The original Cape pair has an M-giant third (presumably optical) component on its east side about 8" from the primary. The 'C' component is: 2MASS J08030998-4319551, 8".05 east of the Tycho-2 position for the primary. It does seem to be listed in the Rousseau catalogue that was made as part of the Hipparcos input catalogue, so it has been noticed previously. In fact in the Dommanget CCDM catalogue, the WDS's AB pair is called 'AC', and the red star is assigned component 'B'. The 2MASS J-K color is that of a mid/late-M giant, and thus is surely the object to be linked to IRAS Z08015-4311. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 67534 is cpm pair [Skf 75] Date: Fri, 28 Aug 2009 13:46:20 -0700 This is a wide (18") pair that Houk says have very similar spectral types (she gives only F0/2 due to the overlapping spectra). They are resolved in the Cape and Cordoba catalogues, but only a single combined-light entry in the HD. HD 67534a = CD-47 3586 = CPD-47 1848 = TYC 8140-6544-1 = UCAC2 11027354 8 06 17.73 -48 08 40.7 (J2000, UCAC2) HD 67534b = CD-47 3585 = CPD-47 1847 = TYC 8140-6545-1 = UCAC2 11027352 8 06 17.41 -48 08 58.8 (J2000 UCAC2) UCAC2 motions are very similar --- UCAC3 is just appearing but not quite yet at VizieR. We have our screen-plot routine running here with UCAC3 already thanks to a "black market" DVD from Dave Monet. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 67611 cpm companion [Skf 76] Date: Fri, 28 Aug 2009 14:08:29 -0700 Another wide (31") pair with common motion and colors consistent with the delta-mag. The fainter component is just a little too faint to show in the classical catalogues except AC2000, but appears again in UCAC2. HD 67611a = TYC 8144-0154-1 = UCAC2 10802118 HD 67611b = AC2000 3569883 = UCAC2 10802108 Houk calls the primary F2III/IV, and the secondary about 2 mag fainter is a G star by colors. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 68114/5 [Skf 77] Date: Fri, 28 Aug 2009 15:24:18 -0700 Another "obvious" wide common-motion pair with near-identical spectral types and UCAC2 motions. HD 68114 = UCAC2 10579339 -9.9 +2.6 mas/year HD 68115 = UCAC2 10579355 -8.6 +2.1 I suppose that in this part of the sky, a fair bit of the motion is the solar-reflex motion toward the galactic anticenter (?). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 08141-4044 = WG 89 and comp Date: Fri, 28 Aug 2009 22:35:02 -0700 The HD shows two numbers here with the implication that the spectral type is the combined type for the two stars (actually 5" pair plus more distant companion southwest). However, the 2MASS and Tycho-2 colors show that only the isolated companion is red and that the closer 'AB' pair are much bluer. So the K2/3 + K0 types shown in the WDS both apply only to the 'C' component, and Houk's approximate type of 'K' for the secondary is wrong. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 69167 and friend [Skf 78] Date: Fri, 28 Aug 2009 22:45:37 -0700 This wide pair has two entries in some sources, but not the WDS. Though the motions are small and equivocal, both stars have essentially the same colors (B9IV/V for the brighter star from Houk; B9 or A0 for the fainter one), so proximity and uncommon types argue for their being a physical pair. They are given separately as far back as the Cape zone catalogue of 1936, and also in ye olde SAO catalogue (SAO 219633/34), plus the Tycho input catalogue, but not Tyc1, ACT, or Tyc2. Also AC2000 per VizieR. As of today also UCAC3, but UCAC2 has it as well. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 70066 and cpm companion [Skf 79] Date: Sat, 29 Aug 2009 12:20:13 -0700 A good clear case of common motion for two dwarfs near K0. [Hip2 pi = 4.0 mas, so must be giants!] Even UCAC3 agrees and is not problematic. The primary is an Hipparcos star, so the secondary is one more star with an inferred parallax. Astrometry goes back to the AC. About 42" separation. HD 70066 = UCAC3 023305371 -55.0 -1.1 mas/year UCAC3 023315304 -55.3 -1.5 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 70542 optical pair [Skf 80] Date: Sat, 29 Aug 2009 13:35:49 -0700 This wide (10") pair appears to an optical one, with Tyc2, UCAC2, and UCAC3 fairly consistent. Dunno if such pairs are worth noting, but it seems somebody's bound to come across it. The HD catalogue gives type F5, evidently for the combined light, but the photometric colors suggest the type is correct for the NE component, slightly brighter in the blue. Houk gives types A + K, and the K type is close enough for the slightly redder SW comp, which seems to be a likely dwarf with larger (but modest) motion, and via the delta-mag must be in the foreground. HD 70542a = CPD-50 1556 = UCAC3 022295992 HD 70542b = CPD-50 1557 = UCAC3 022293582 ...yes, the southern, preceding star has the higher CPD number (same RA but different Dec in the CPD catalogue). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 08205-5130 = Rst 315 [Skf 81 etc] Date: Sat, 29 Aug 2009 13:45:31 -0700 The similarly-bright distant companion to this pair shares common motion (Tyc2/UCAC2/UCAC3) and has spectral type consistent with it being connected. HD 70585 = UCAC3 022084536 -12.7 +4.2 mas/year HD 70586 = UCAC3 022086632 -12.0 +4.7 (this is Rst 315) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 71058 = WDS 08237-4151 third component [Skf 82 etc] Date: Sat, 29 Aug 2009 16:04:50 -0700 DSS and 2MASS images show a third fairly close component to this binary. It is recorded in the 2MASS catalogue about 6" NE of the closer pair. The very red color in the 2MASS and DENIS catalogues suggests it is a background M giant. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 72518 and CD-51 3060 [Skf 83] Date: Sat, 29 Aug 2009 21:58:01 -0700 Another wide pair (40") with common motion and delta-mags consistent with spectral types and/or colors. Since they clearly have parallel motion in Tycho-2, I'm surprised they weren't picked up in the TDSC. Tycho-2, UCAC2, and UCAC3 are consistent with the motions. Houk calls the HD star type K0III, while the delta-mags and colors indicate an F-dwarf for the secondary. HD 72518 = UCAC3 021788571: -21.7 +24.4 mas/year CD-51 3060 = UCAC3 021792535: -20.7 +26.4 mas/year =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 08323-4602 = TDS 5919 is real Date: Sat, 29 Aug 2009 22:58:27 -0700 Though I'm normally suspicious of unconfirmed TDS pairs, this one appears to be real. It is HD 72676, which Houk gives as a composite binary with types G/K:III + A5V. If you assume an ordinary G8 or K0 giant for the cool star, it fits the TDS derived colors very nicely. The best thing (to me) is that we now know which type goes with which component. The original HD type is F5, which is clearly a compromise type. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 226030 third component [Skf 84 etc] Date: Sun, 30 Aug 2009 15:15:45 -0700 Making a UCAC3 test in the northern Milky Way at the suggestion of Francois Ochsenbein. I'm looking at a 200-star chunk of the first section of the HDE in Cygnus. Anyway, I notice that WDS 19496+3939 = hj 2903 has a third component not far from the current secondary. (Could the 8" separation of the early WDS observation actually be for the mean of the BC pair?) The primary alone is in Tycho-2; UCAC2 has the primary and "new" third star at 10".6 distance; UCAC3 has all three stars in five entries --- two poor entries for the bright star, the secondary apparently okay, and two more entries for the third star with identical coords, no proper motion, and one without a 2MASS link. The trio shows very nicely on the 2MASS J-band image, but can be seen well enough on the DSS2 red or far-red images. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 17536-1726 = HDO 147 third component [Skf 85 etc] Date: Sun, 30 Aug 2009 19:44:00 -0700 This object, which is HD 312312, has a third component that shows up clearly on the DSS2 far-red and 2MASS J-band images. The 'C' component lies 3".0 in about pa 290 from 'A' if the 2MASS astrometry is accurate. Since the HDE type is B8, reasonably consistent with the wider pair (with modest reddening), and the third star really appears only at longer wavelengths, I assume it is a background M giant interloper. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, nz@usno.navy.mil Subject: HD 312423 is double (not in WDS) Date: Sun, 30 Aug 2009 22:16:34 -0700 This pair is resolved in UCAC3, but the motion for the secondary is spurious --- it results from a position of the primary combined with a position of the companion taken to represent actual motion: the motion is directly away from the brighter star. This is one of a very large number of similar cases. The star is HD 312423, HDE type A3, which is consistent with colors for the brighter star alone. Separation is about 3".8. HD 312423a = TYC 6258-1211-1 = UCAC3 059888718 = 2MASS J17572560-1925141 HD 312423b = UCAC3 059887588 = 2MASS J17572568-1925177 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 312453 is double [Skf 86] Date: Sun, 30 Aug 2009 23:00:37 -0700 This star is a 4".4 pair per 2MASS astrometry. The primary is HD 312453 (A0), which MacConnell finds to have H-alpha emission (1981A&AS...44..387M, his star [M81] I-615). The secondary appears in 2MASS and UCAC3, though again the latter shows proper motion directly away from the primary (due north in this case). Combined V mag from ASAS-3 is 10.8. HD 312453a = TYC 6255-2440-1 = UCAC3 062392992 = 2MASS J18004254-1720442 HD 312453b = UCAC3 062394424 = 2MASS J18004256-1720399 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 74107 and two companions [Skf 87] Date: Mon, 31 Aug 2009 16:03:08 -0700 Hope you're not getting tired of these! This trio lies on the periphery of the open cluster IC 2395, so is perhaps not so remarkable because of that. The companions lie 8" E and 10" NNE of the brighter HD star. The motions from UCAC2/3 are at the small solar-reflex level toward the northwest, so are somewhat equivocal. I do note that the companions are only slightly less blue than the primary. Though not in the WDS, SIMBAD does show two components, evidently from a photometric survey of the general cluster region by Claria et al (2003A&A...409..541C). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 74652 cpm companion [Skf 88] Date: Mon, 31 Aug 2009 19:40:35 -0700 This looks like another good one in Tyc2/UCAC2/UCAC3 from common proper motion and delta-mags/color/spectral-type consistency. The companion is 37" NNW and is consistent with being a dwarf near K0 compared to the K2III primary. HD 74652a = TYC 8569-0031-1 = UCAC3 020991604 HD 74652b = UCAC3 021003700 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, nz@usno.navy.mil Subject: Note on WDS 08421-4256 = LDS 230 Date: Mon, 31 Aug 2009 22:24:14 -0700 This is a wide large-common-motion pair where the UCAC3 motion is poor for the secondary. Looking at various images, it appears that probably earlier-epoch positions for the faint star are compromised by it having passed near a field star. It probably also hasn't helped that on the Schmidt plate-scans it is just off the diffraction spike from the primary. The secondary is now well-separated from the background star per 2MASS images. USNO-B1.0 shows five entries for the faint star at different epochs or combinations with the background star; GSC-2.3 shows two entries at distinct epochs. I don't see any new recent astrometry in VizieR except 2MASS, and the inferred position of Gould in 2004ApJS..150..455G. Anyway, the WDS could be updated a bit, and UCAC3 corrected. hmmm....just wondering if the scans from the Whiteoak extension of POSS-I were available, you could do a local reduction and get a good position (or sep/pa) for the faint star circa 1960. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 76211 trio (not in WDS) [prob Skf 89] Date: Tue, 01 Sep 2009 12:56:05 -0700 This trio seems to have been measured by Rousseau et al as part of Hipparcos-related stuff, but is not present in the WDS. The brightest star is HD 76211 (A0V), and the 'B' companion 15" S at least seems to be a likely physical companion based on colors and delta-mag. The 'C' comp 17" NW is a bit off in motion (but well within errors, since it is the faintest of the three) but okay in color. The primary is at: 8 53 03.92 -45 22 24.5 (J2000, UCAC3). [later follow-up] From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 08323-4150 mix-up ? Date: Mon, 07 Mar 2011 12:11:45 -0700 I'm not totally certain, but I think there's a mix-up due to transposed digits for WDS 08323-4150 = Skf 89. The WDS shows this as being HD 72611 with a companion about 21" NW. In my collected notes, I have a _trio_ around HD 76211 (not 72611), which is not shown in the WDS, and the chronological order of the e-mail is right where Skf 89 ought to be. Looking at the HD 72611 (the WDS pair), besides not having a note about that star (the e-mail could have gone missing), I don't see any reason why I would have mentioned the faint companion as a result of looking in VizieR or SIMBAD (which is how it would have happened). So I'm pretty sure the current Skf 89 = WDS 08323-4150 should be deleted and replaced with the other star-trio. Measurements collected for my second Webb Society list copied below, and my original e-mail from Sep 2009 added at the bottom. Lemme know what you decide here so I can adjust my report accordingly. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords improvement for Don 296 Date: Tue, 01 Sep 2009 13:51:22 -0700 This guy is not far from HD 76567, and I noticed it has approximate coordinates in the WDS that are about an arcminute off. A VizieR search shows: WDS 08551-4622 A = Don 296 A = UCAC3 027404246 = 2MASS J08550945-4621173 = DENIS J085509.4-462117 WDS 08551-4622 B = Don 296 B = UCAC3 027404523 ...probably not related to the nearby HD star. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Rst 361 third component [Skf 90 etc] Date: Tue, 01 Sep 2009 14:15:01 -0700 The more distant companion to this known pair seems to have UCAC3 motion consistent with Tycho-2's motion for the primary of the closer pair. (I suspect the UCAC2 motion is a bit skewed by the secondary star.) Notice also the quite blue color of the fainter third star, consistent with the spectral type of the primary (HD 76589, B9IV) and delta-mags. The spectral type by Slawson is from Curtis Schmidt objective-prism plates. The VizieR listing also shows Rousseau measured this star, so it is again not original with me. WDS 08554-4653 = Rst 361: okay in WDS WDS 08554-4653 C = CD-46 4760 = CPD-46 3244 = TYC 8156-3117-1 = UCAC3 026835950 = 2MASS J08552361-4653457 --- spectral type A0V: (1988AJ.....96..988S) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 76776 cpm companion [Skf 91] Date: Tue, 01 Sep 2009 14:38:59 -0700 The companion 54" SE of this star has closely common motion somewhat different from the usual solar-reflex motion, and the delta-mag and 2MASS color are consistent with a late-K dwarf (about like 61 Cyg A), so perhaps slightly more interest than usual. The brighter star about 2' E seems to be unrelated per motion and colors. HD 76776 A = TYC 7688-1000-1 = UCAC3 029950874 --- Houk type 'Fm delta Del', and HD type of A5 are consistent with color near F0 (HD types are too early wrt the MK scale in this area); in her notes Houk gives an alternate type of A9III/IV HD 76776 B = UCAC3 029942115 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 77046 cpm companion [Skf 92] Date: Tue, 01 Sep 2009 15:42:42 -0700 The companion to this 15" pair is recorded in the old Cape and Yale zones as a separate star, while Tycho-2 and UCAC2/3 show the motions to be very similar. The spectral type for the primary is in the Hertzsprung gap, which may mean it is a unrecognized spectroscopic binary. The 2MASS color for the companion implies a late-F dwarf. HD 77046 A = TYC 8152-0052-1 = UCAC3 027563863 HD 77046 B = TYC 8152-2281-1 = UCAC3 027563350 From: Brian Skiff To: question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr, francois@newb6.u-strasbg.fr, bdm@usno.navy.mil Subject: Coords/IDs for HD 77046 and companion [Skf 92] Date: Wed, 02 Sep 2009 12:03:03 -0700 Brian Mason (USNO) points out that the coordinates for HD 77046 are greatly in error in SIMBAD. Although there is an SAO/PPM mix-up for the star and a fainter companion, I was not able to figure out how the HD star got a precise position for blank sky. The HD catalogue itself is okay, and links from a coordinates search in VizieR also look okay. The SIMBAD position for the fainter common-motion companion is for the HD star, and the star is linked incorrectly with SAO, PPM, Yale zone and 2MASS numbers (again for the HD star). A fairly complete set of aliases is shown below. HD 77046 = CD-45 4742 = CPD-45 3294 = CPC 0 6817 = SAO 220704 = CSI-45 3294 42 = YZ 30 5942 = PPM 313829 = TYC 8152-0052-1 = UCAC3 027563863 [coords okay] = 2MASS J08581620-4611523 = MSX6C G266.8561-00.3048 8 58 16.19 -46 11 52.3 (J2000, Tyc2/UCAC2/UCAC3) --- UBV (Grenier) and uvby (Olsen) data are okay --- MK types: G3III (Houk) G4III (Slawson, 1988AJ.....96..988S) --- the unexpected MSX detection adds astrophysical interest to the system along with the spectral type in the Hertzsprung gap CD-45 4742B = CPD-45 3294B = HD 77046B = CPC 0 6818 = SAO 220705 = YZ 30 5943 = TYC 8152-2281-1 = UCAC3 027563350 = 2MASS J08581766-4611541 8 58 17.66 -46 11 54.2 (J2000, UCAC2) --- Tyc2, UCAC2, UCAC3 coords differ only from round-off errors at the 0".1 level =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 77652 close comp [Skf 93] Date: Wed, 02 Sep 2009 14:17:01 -0700 Happened to notice this one due to an old GSC position being a bit farther off than usual, which is usually due to an unresolved companion. GSC v1.2 and 1.3 are actually pretty close, but there's still a faint companion there identifiable on the 2MASS J-band image. It's too close to show in the more recent astrometric catalogues via VizieR, but an estimate is 2".5 in pa 315. delta-mag on the J image is ~2; if the companion is redder than the A1V primary (most likely), then it'll be larger in the visible (maybe ~3 ?) --- not any crazier than other typical large delta-m Rossier/Donner/van den Bos pairs in the south! Do note that the DSS2 red plate shows all stars in this area as elongated SE-NW, either a guiding error or differential refraction. In case there's a problem, HD 77652 is at: 9 02 09.02 -46 55 53.7 (J2000, UCAC2). A rough estimate for the secondary from the 2MASS image using the SkyView utility is: 9 02 08.85 -46 55 52.1 with the RA more uncertain. That position yields 2".4 in pa 313, rounded off above. I'm near the end of the current batch of HD stars, so maybe few/no more for now! =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 18063-1941 = J 1619 Date: Thu, 03 Sep 2009 12:14:44 -0700 The combined V mag for this pair from ASAS-3 is V = 11.09 +/- 0.03. They look dead-equal, so the individual magnitudes ought to be adjusted 2 magnitudes fainter. The pair is also HD 312575 (type A0) = CPD-19 6445. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 312610 companions [Skf 94] Date: Thu, 03 Sep 2009 13:45:03 -0700 Kind of a marginal case, but this early-type star has two companions. The brighter one is at 6".3 WNW, while the much fainter one comes up on 2MASS images 4".5 WSW. There is a UCAC3 entry (UCAC3 062555440) that picks up the 2MASS data for a star that is some 3" from the UCAC3 object, so has some problem. What I'm calling the 'b' component also appears in the CMC14 and DENIS catalogues. ASAS-3 shows V=10.3 for the combined light. HD 312610 a = BD-17 5039 = TYC 6268-0866-1 = UCAC3 062556977 18 09 29.71 -17 11 56.2 (J2000, UCAC3) --- HDE type B5 HD 312610 b = UCAC3 062557346 = 2MASS J18092927-1711550 HD 312610 c = 2MASS 18092941-1711582 (fairly red?) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 18072-1854 mix-ups Date: Thu, 03 Sep 2009 14:46:16 -0700 This system includes a wide optical pair now some 28" apart. I don't think it is quite clear that the closer 'BC' components are the large proper motion object to the southwest of the somewhat brighter Stn 41 A component, which is essentially fixed (it is the K2/3III: star HD 165528). The WDS coordinates are a bit mixed (the close pair at different epochs?), and shows the A comp to share the large motion with the BC pair. The fainter close pair is HD 312644 (K0), and the 2MASS color suggests a somewhat later-K dwarf. Interestingly, the POSS-I plate-scans show the motion clearly wrt 2MASS etc, and the HDE chart, though of rather small image-scale, shows the stars nearly E-W compared to their present locations. The 2MASS J-band image shows the closer pair as oval in the right orientation, so the ID is obvious. =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 312761 and companions [Skf 95] Date: Thu, 03 Sep 2009 20:55:05 -0700 This is a UCAC3 pair with 'double star' flags. The separation is about 6". The HDE type for the primary is A2, and the fainter star is ~2 mag fainter but not much redder (unusual for so faint a star in this part of the sky), so has a fair chance of being related. UCAC3 shows the companion to have spurious large motion directly away from the primary. HD 312761 a = TYC 6272-0242-1 = UCAC3 060354920 18 12 30.66 -19 01 19.5 (J2000, UCAC3) HD 312761 b = UCAC3 060353878 = 2MASS J18123101-1901225 18 12 31.01 -19 01 22.5 (J2000, 2MASS) I note that the Nesterov et al (and also the later Fabricius et al catalogue) mis-identify the HDE star as a third star about 17" NW. This is moderately red and much fainter in the blue, so is not the intended HDE star (the mark on HDE chart 162 is admittedly ambiguous). =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 312789 is composite double (not in WDS) Date: Thu, 03 Sep 2009 21:45:14 -0700 I noticed a discrepancy between the HD spectral type and the 2MASS color for this star, which led me to examine DSS/2MASS images. The pair is evident but not quite resolved in the 2MASS images, and just barely in the catalogue. The blue star is the southern component, which appears in various catalogues back to the AC. The red companion, presumably a background M giant, lies about 2".3 north and slightly west. HD 312789 a = UCAC3 059815928 = 2MASS J18100429-1929097 18 10 04.31 -19 29 10.1 (J2000, UCAC3) --- HD type A2 HD 312789 b = 2MASS J18100428-1929078 18 10 04.29 -19 29 07.8 (J2000, 2MASS) =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 312835 and companion [Skf 96] Date: Thu, 03 Sep 2009 23:43:47 -0700 This seems to be another close but likely optical pair. Rousseau reported a faint companion 11" SE, but this is a different star. My inference from the spectral type and the motion implied by the early AC position is that the HD star (type G0) is a dwarf with modest motion toward the NE --- the Tycho-2 and UCAC3 proper motions are of the right order (for now I prefer Tycho-2 since it probably didn't detect the companion, thus the astrometry is less likely to be skewed by it). The companion at about 3".5 NE is, by similar inference, is a background red giant probably with negligible motion, and the dwarf is creeping up on it slowly. HD 312835 a = TYC 6268-1650-1 = UCAC3 061969977 = AC2000 2803690 = 2MASS J18143525-1742057 18 14 35.25 -17 42 05.9 (J2000, Tycho-2) HD 312835 c = 2MASS J18143542-1742037 18 14 35.43 -17 42 03.7 (J2000, 2MASS) --- called 'c' in deference to Rousseau component already in the literature =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 312913 and companion [Skf 97] Date: Fri, 04 Sep 2009 12:42:34 -0700 This is another relatively close pair with disparate colors, including a red component that comes up at longer wavelengths. Separation is 2".8 if the 2MASS position for the red star is taken at face value wrt Tyc2/UCAC2/UCAC3 for the primary A-type star. A crowded bit of real estate in the M24 starcloud, and the inferred types imply they're an optical pair. HD 312913 a = CPD-19 6614 = TYC 6272-1711-1 = UCAC3 060326469 18 13 43.45 -19 02 43.1 (J2000, UCAC3) --- HDE type A HD 312913 b = 2MASS J18134325-1902433 18 13 43.26 -19 02 43.3 (J2000, 2MASS) =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: WDS 18129-2021 = WDS 18131-2025 Date: Fri, 04 Sep 2009 14:12:05 -0700 I'm pretty sure the current WDS identification for the trio J 1621 is not the right star. It is instead about 3'.5 SE, and thus is the same as WDS 18131-2025 = Ara 1141. Have a look at: HD 312983 a = BD-20 5036 = CPD-20 6876 = TYC 6272-0833-1 = UCAC3 058738580 18 13 05.60 -20 24 28.3 (J2000, UCAC3) The VizieR report shows that the Rousseau gang also picked these up as part of the Hipparcos input catalogue work. It is worth noting that the 'C' component about 23" NW is itself a pair, another case where a very red companion pops up at the longer wavelengths. They are about equally bright on the DSS2 'infrared' (actually the far-red IV-N plate) scan. =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 313010 red companion [Skf 98] Date: Fri, 04 Sep 2009 19:39:52 -0700 Here's another one of these pairs where a (presumed) background M-giant is superposed close to a blue star. The companion is 3".8 SW per 2MASS astrometry of the red star, and is nearly equally bright on the 2MASS J-band image. HD 313010 a = TYC 6269-0304-1 = UCAC3 062141901 = 2MASS J18165119-1733323 18 16 51.20 -17 33 32.1 (J2000, UCAC3) --- HD type A2 HD 313010 b = 2MASS J18165097-1733340 = MSX6C G013.4275-00.5723 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 313111 and companion [Skf 99] Date: Fri, 04 Sep 2009 22:34:55 -0700 One more reasonably close blue/red pair of about 3" separation. The pair are about equal on the DSS2 far-red plate-scan, and the red star dominates in the 2MASS J-band image. HD 313111 a = CPD-20 6955 = TYC 6273-1416-1 = UCAC3 058777460 = 18 16 41.87 -20 22 26.0 (J2000, UCAC3) --- HD type A2 --- UCAC3 link with 2MASS is incorrect (belongs to the companion) HD 313111 b = 2MASS J18164200-2022283 = DENIS J181641.9-202228 18 16 42.00 -20 22 28.3 (J2000, 2MASS) =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 313109 double/triple ? (not in WDS) Date: Fri, 04 Sep 2009 22:49:40 -0700 I pondered this one for awhile, but can't decide what's going from available data and images. Nominal Tycho-2 position is: 18 16 15.15 -20 27 12.1 (J2000). The DSS1 short-V plate, DSS1-blue, DSS2 red and far-red --- all the readily available Schmidt plate-scans --- show the star obviously oval and at least double if not triple with merged images. The 2MASS images show two stars clearly, maybe a third on the W side of the brighter SE component. The blue-based astrometric catalogues are centered on the southeastern component, though the images look relatively equal. Two entries in 2MASS with rough photometry. ...well, that's about it; maybe this one isn't quite ready for prime-time yet. Higher resolution required! The fuzzy thing about 20" NE is the planetary nebula NGC 6578. =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 313158 and red companion [Skf 100] Date: Sat, 05 Sep 2009 11:29:18 -0700 One more blue/red pair in the M24 starcloud. The HD star has a red companion located 3".7 SE per 2MASS astrometry (also in DENIS). The red star is discernable on the DSS2 far-red scan, and is obvious in 2MASS images (roughly equal at J). It is presumably an unrelated background M-giant. HD 313158 a = TYC 6269-1754-1 = UCAC3 061372829 18 20 38.88 -18 11 04.6 (J2000, UCAC3) --- V = 10.5 (Tycho-2) HD 313158 b = 2MASS J18203905-1811074 =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: WDS 18274-1838 = Leo 17 mix-up ? Date: Sat, 05 Sep 2009 15:38:19 -0700 There is a trio of stars here, but I think the AB measurement doesn't belong somehow. The main AC pair, which probably constitute HD 313345 (F0), look okay, but there doesn't seem to be a 4"/pa211 pair here. Working from C, there is a star 4".8 due W, and another 5".2 NW (maybe pa320). The 2MASS J-band image shows this trio clearly, so another star at a similar distance SW should be obvious from either A or C. Am I missing something here? =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 313346 and red companion (not in WDS) Date: Sat, 05 Sep 2009 15:52:22 -0700 One more of these with a reasonably close red companion. It is at least present on all the visible-light DSS plate-scans. HD 313346 a = TYC 6270-0988-1 = UCAC3 060888091 = 2MASS J 18265842-1834406 = DENIS J182658.4-183440 18 26 58.43 -18 34 40.6 (J2000, UCAC3) --- HDE type A, consistent with Tycho-2 BT-VT and 2MASS J-K --- Yale zone catalogue also shows G0, apparently also provided by Cannon; perhaps this is a compromise type for the combined light of the pair HD 313346 b = UCAC3 060889635 = 2MASS J18265851-1834361 = DENIS J182658.5-183436 18 26 58.51 -18 34 36.2 (J2000, 2MASS) --- likely background M giant --- UCAC3 proper motion wrong (radial from primary) =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: HD 313384 is double [Skf 101] (end paper 2) Date: Sat, 05 Sep 2009 16:30:12 -0700 This looks like a conventional moderately close pair that is just resolved in UCAC3 and 2MASS. They look nearly equal, but I take the NE component to be the primary if only because that's the star Tycho-2 picked-up. 2MASS coords adopted for now, which gives a separation of 2".9. The HD type is A5. UCAC3 flags both stars as the "secondary component of a real double". This should be the last pair in the current batch (HDE charts 161, 162, and 163). HD 313384 a = TYC 6274-0757-1 = UCAC3 058835522 = 2MASS J18260422-2019244 18 26 04.23 -20 19 24.5 (J2000, 2MASS) HD 313384 b = UCAC3 058836279 = 2MASS J18260434-2019220 18 26 04.35 -20 19 22.1 (J2000, 2MASS) =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: Note on WDS 11065-5316 = hj 4405 Date: Sun, 06 Sep 2009 14:00:39 -0700 While trying to get a 'best' position for the fainter star in this pair, I notice that Hipparcos 1 gives a spurious proper motion (and parallax) for this star. Tycho-2 has two entries for the star, one that copies Hip1 and the other is "new" but lacks proper motion --- that one is however correct (the magnitude, too). The TRC shows the pair with essentially correct position, and van Leeuwen's Hip2 seems to come closest: zero parallax for both stars, and (voila) probably common proper motion (delta-mag is consistent with that). The separation is closer to 20" than 16" per the WDS. Oh, and Gray & Corbally (2006AJ....132..161G) give type F5V for the fainter star. =============================================================================== From: Brian Skiff To: grayro@appstate.edu, bdm@usno.navy.mil Cc: corbally@as.arizona.edu, question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr Subject: Note on HIP 82725/24 Date: Wed, 09 Sep 2009 13:58:12 -0700 This pair (actually trio, see below) has bad parallaxes and proper motions in both HIP1 and HIP2. Inquiring a bit further I think I see what's going on. Briefly, the southern star of the 13" optical pair is HIP 82725, observed by Gray & Corbally as type K0IV. Tycho-2 and the Fabricius & Makarov revised Hipparcos astrometry paper (2000A&AS..144...45F) show more realistic motion, i.e. small. Jao et al (2003AJ....125..332J) claim this is a giant from spectra. They also give the position-angle of the wider pair as pa 109 --- perhaps a typo for pa 169. Now the northern star HIP 82724 appears to have significant motion from simple inspection of DSS/2MASS images. Again the Fabricius & Makarov paper seems to have it right --- but it is nothing like the Hipparcos motion. Although it was examined on CCD images with 1".0 seeing by Jao et al, they seem to have missed the faint red companion ~3" due E of the Hipparcos star. The companion is not visible on the regular DSS blue plate, but begins to appear in the far-red IV-N plate and in the longer-wavelength 2MASS images. (It is not listed separately in the 2MASS catalogue.) The field is at moderately-low galactic latitude, so there's a fair chance that the faint companion is a background M giant. Because of the motion of the brighter star, an image taken "tonight" would settle it. Finally, I note that Stock & Wroblewski (1972POAN....2...59S) reported the spectral type (probably for the pair taken together) as a weak-lined M star. Their catalogue has a lot of similar cases where an unrecognized strongly-overlapping pair has been classified as something pathological. The 2MASS colors are rather poor, so it's not obvious from those what's going on, though clearly HIP 82724 is a K/M dwarf. SIMBAD adopts the poor Hipparcos positions, so they are somewhat in error. Improved coordinates are shown below. HIP 82725 = TYC 9043-0362-1 = 2MASS J16543253-6224142 16 54 32.54 -62 24 14.2 (J2000, Tycho-2) 16 54 32.53 -62 24 14.3 (J2000, 2MASS) 16 54 32.55 -62 24 14.1 (J2000, 2000A&AS..144...45F) --- proper motion: pmA = -2.5 pmD = -14.6 mas/year (Tycho-2) +8.2 -4.2 (Fabricius) HIP 82724 = TYC 9043-0213-1 = 2MASS J16543221-6224011 16 54 32.21 -62 24 01.2 (J2000, 2MASS) 16 54 32.19 -62 24 01.3 (J2000, 2000A&AS..144...45F) --- parallax: 7.6 +/- 7.6 mas (Fabricius) --- proper motion: pmA = 45.7 pmD = 15.8 mas/year (Fabricius) HIP 82724 b: 16 54 32.7 -62 24 01 (estimate from 2MASS image) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, nz@usno.navy.mil Subject: HD 153580 and BPM 24601 [Skf 103 etc] Date: Wed, 09 Sep 2009 14:28:55 -0700 UCAC3 wins at last! The BPM star is a white dwarf that shares common proper motion with HD 153580 about 2' distant. Not present in the WDS. Though present in NOMAD with correct motion, the WD star has two other neighboring unlinked entries. USNO-B1.0 shows two unlinked entries with zero motion. But UCAC3 has it right --- rah! From: Brian Skiff To: bdm@usno.navy.mil Subject: More Re: HD 153580 and BPM 24601 Date: Sun, 04 Oct 2009 00:08:16 -0700 On Wed, 2009-09-09 at 14:28 -0700, Brian Skiff wrote: > UCAC3 wins at last! The BPM star is a white dwarf that shares > common proper motion with HD 153580 about 2' distant. Not present > in the WDS. Though present in NOMAD with correct motion, the WD star > has two other neighboring unlinked entries. USNO-B1.0 shows two > unlinked entries with zero motion. But UCAC3 has it right --- rah! > > > \Brian > I mentioned this wide common-motion pair a few weeks ago with the comment about finding the UCAC3 had the motion correct. John Greaves pointed out to me that the pair, though not noted in the WDS, is not new. It was first linked by Gary Wegner in one of his numerous white dwarf papers: 1973MNRAS.165..271W. It is pair 4a,b in his Table I, with motion details (as of 1973) given in Table II. The sentence in the text immediately above Table II describes the find. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, grayro@appstate.edu, corbally@as.arizona.edu Subject: CD-48 11837 = HIP 86057 as double [Skf 104] Date: Wed, 09 Sep 2009 16:07:56 -0700 In their NStars southern sample, Gray et al (2006AJ....132..161G) note that this star is a visual binary and obtained classification spectra of both stars. They are not resolved in astrometric catalogues available through VizieR. The authors report the separation is about 4" with the fainter component to the NW. This is confirmed on a 2MASS J-band cut-out. The Mermilliod UBV compilation shows V = 10.13, obviously for the combined light; similar value from the Geneva seven-color data. delta-mag at J is about 1.5 or somewhat larger. The MK types are M1.5V and M3V. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 172555 and CD-64 1208 [Skf 105 etc] Date: Wed, 09 Sep 2009 21:36:46 -0700 UCAC2/Tyc2 shows that this wide pair (71") have common motion. This has been evident at least since the CPC vol 21 of 1966, and in the similar Yale zone (not published until 1983). The relatively large motion makes it surprising that Luyten didn't pick it up. Since it adds another star with an implied Hipparcos parallax, it is certainly worth noting. HD 172555: 18 45 26.90 -64 52 16.5 (J2000, Tycho-2) pmA = 32.9 pmD = -148.2 mas/year (Tyc2) CD-64 1208 = CPD-64 3950 = TYC 9077-2489-1 = UCAC2 03404226 18 45 37.03 -64 51 45.9 (J2000, UCAC2) pmA = 30.3 pmD = -153.1 mas/year (UCAC2) --- V = 9.5 (somewhat brighter than Tyc2 value) --- UCAC3 motion for the secondary is poor --- spectral types: M0 (1966AnCap..21.....S, supplied by Mayall) K5Ve (2006A&A...460..695T) K7e (2006AJ....132..866R) ...Torres et al note this is a possible a spectroscopic binary and that the Li 6707A line is strong The SIMBAD biblio suggests folks have been looking for planets in the system due to its young age; the secondary even has a fair number of HST exposures logged. So it could be that someone else has noticed the connection with the bright star previously. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, grayro@appstate.edu, corbally@as.arizona.edu Subject: HD 207496 new(?) cpm companion [Skf 106 etc] Date: Thu, 10 Sep 2009 19:55:28 -0700 This pair is WDS 21549-7720 = HDS 3117. The Hipparcos companion is not terribly obvious on any images, but another one that clearly has common motion is obvious. It lies 8" NW of the brighter star, and is recorded almost correctly in UCAC3 (the proper motion is wrong). The 2MASS catalogue observation date is 1999 Dec 5, so provides a confirming position for both stars close to J2000.0. The two stars are recorded in the AC, so the astrometric history goes back 100+ years. In their Hipparcos survey, Gray & Corbally gave types K2.5V (k) and M2.5V for the two stars. (The 'k' in parens indicates modest chromospheric activity expressed by emission in the cores of the CaII H&K lines.) They make no special comment about the binary. Upgren et al and Houk gave similar types for the primary. delta-mag in the blue is about 3.5 per the AC magnitudes, but down to ~1.5 at J in 2MASS. =============================================================================== From: Brian Skiff To: grayro@appstate.edu, corbally@as.arizona.edu, question@simbad.u-strasbg.fr, bdm@usno.navy.mil, arnaud.siebert@astro.unistra.fr, francois@newb6.u-strasbg.fr Subject: HIP 114110 mix-up Date: Sat, 12 Sep 2009 16:33:04 -0700 Here's a fun mess for you! I haven't quite sorted things out, but here's what I see. In their southern NStars paper, Gray & Corbally (et al) give the type G1V for a star they call HIP 114110. In principle this is a companion about 30" south of HD 218251 = BD-15 6346 = HIP 114113. Inspection of DSS images shows that HIP 114110 does not exist at the location given, and HD 218251 has no companion matching the description in HIP or the WDS. The Gray & Corbally MK type indeed seems to be for HD 218251, being a good match with Stromgren colors. Now about 5' south-southeast is a wide pair that does seem to match the WDS description and the Hipparcos specs. This pair is HD 218264 = BD-15 6348 (not in Hipparcos); the primary is a garden-variety K-giant. Available proper motions suggest it and the companion 30" SW could be related, though delta-mag is only ~2, and the 2MASS J-K color suggests the companion is a G dwarf, which thus ought to be somewhat fainter if single itself. In the AC 2000 the separation is 29".6 at epoch 1905, while in 2MASS the separation is 29".5 in 1998.5. Looks pretty good to me --- maybe the secondary is a bit evolved if a G star. I don't know what SIMBAD policy is about HIP stars that do not exist. There must have been a goof in preparing the input catalogue. I know there are many instances where the spacecraft observed the wrong star (missing the target), but heretofore in my experience those wrong stars at least were actually there. (SS Cyg is a well-known(?) example that Hipparcos missed.) At least a note should be added to SIMBAD to say that there is no star for HIP 114110. The parallax and proper motion of HD 218251 = HIP 114113 seem to be okay in various catalogues. The WDS will need to be corrected to show HD 218264 as the intended pair. You guys can take it from there! =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 23582-1725 Date: Sat, 12 Sep 2009 20:10:08 -0700 I notice that this is given with pa 265 from the original publication. On the 2MASS J- and K-band images it looks to be oval but elongated N-S. Could there have been ~90 deg motion in the 7 years between the observations? This of course would make it worth observing again soon! (The skeptic in me wants to suggest the source data are rotated by 90 deg, but who knows.) I would expect a 1".9 equal pair to be less overlapped in the 2MASS images as well --- maybe between 1" and 1".5 in those images? The WDS shows the magnitudes as 8.44 and 8.46. These must be something like H band values if the 2MASS photometry is correct. Reid et al (2003AJ....126.3007R) give V = 11.96, and I got V = 11.9 from ASAS-3 for the combined light. Given that a lot of discoveries and future data will come from outside the visible, I presume you've considered adding a column for the passband of the magnitudes. Stephenson (1986AJ.....92..139S, his star StKM 2-1800) gave the combined type as M1Ve, which is close to the Daemgen types. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr, jack@stsci.edu Subject: HD 122765 and IRAS 14023-6529 [Skf 107] Date: Wed, 16 Sep 2009 21:35:58 -0700 Wow --- here's remarkable pair, certainly an optical one, that I should have picked up previously. At present SIMBAD shows the alias IRAS 14023-6529 for the G dwarf HD 122765. Yet in his IRAS survey Jack MacConnell classified the source as type M7; he also noticed a close companion of type earlier than M. The DSS short-V and red images do not show it (or barely), but the star is obviously double on the DSS2 far-red and 2MASS J-band images. This is by far the brightest such example I have seen. Thus the IRAS source and the HD number need to have separate entries in SIMBAD, and it will be worth noting them in the WDS, since someone will surely wonder about the whopping IR excess of the G dwarf. As best I can tell, all the visible-light based astrometric catalogues record only the G dwarf (back to the AC), and its proper motion appears to be correct (roughly SE), and thus just now making its closest apparent approach to the M giant. Current separation is about 4".8 (difference of 2MASS and UCAC2 coords for the two stars) very nearly E-W. The G dwarf is much the brighter star in the visible. HD 122765: okay in SIMBAD, but not IRAS 14023-6529 --- V = 9.4 (Tycho-2) --- MK type G2/3V (Houk) IRAS 14023-6529 = 2MASS J14061081-6543271 = DENIS J140610.7-654327 14 06 10.81 -65 43 27.1 (J2000, 2MASS) --- V ~16. (estimate) --- spectral type M7 (MacConnell, 1993yCat.3170.....M) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BD+49 299 companion [Skf 108] Date: Thu, 24 Sep 2009 14:51:20 -0700 This one has common motion that is distinct from the general field in this region. The primary is evidently a K-giant while the companion 52" NW is an M dwarf. The motion is readily evident visually comparing DSS1/2, and the fainter star is isolated enough that the motion should be reliable. Of the available motions for the fainter guy (UCAC2, USNO-B1.0/NOMAD, UCAC3 etc), UCAC3 seems to be the odd one out. BD+49 299: 1 07 35.06 +49 48 35.6 (J2000, UCAC2) --- V = 9.4 (Tycho-2, TASS MkIV) --- spectral type K0 (Vyssotsky in 1952CoRut..32....1H) --- pmA = -49.0 pmD = -22.0 (UCAC2) UCAC2 48016595: 1 07 30.412 +49 49 02.6 (J2000, UCAC2) --- V = 15.4 (GSC-2.3, NOMAD/Yale; consistent with CMC14 r') --- 2MASS J-K = 0.86 --- pmA = -45.9 pmD = -22.2 (UCAC2) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Notes on WDS 01409+4952 = ADS 1315 Date: Thu, 24 Sep 2009 19:52:21 -0700 The comment in the WDS for this system that "Star C (mag. 12.7, 18") may be physical" seems to need amendment. There doesn't seem to be any reasonably bright (mag 13) star at 18" radius. Is this referring to the western component at 6" ? This is certainly a physical companion from radial-velocity measurement. I'm assuming for now that the spectral type (K2V) published by Jim Christy and Dick Walker (1969PASP...81..643C) is for the AB visual binary rather than the AB+C composite. It is not really specified in their paper. The only other type I know of is K0, which comes from Vyssotsky's work in the the Rutherford-Columbia zone catalogue (vol 32 of those pubs) that I'm going over presently, and is surely for the combined light of the 6" quartet. Also: the Pourbaix spectroscopic binaries catalogue shows that the 'C' star at 6" is a 2-day SB1 binary. The links shown from VizieR for this system in the Pourbaix catalogue (B/sb9) seem to be very much in the direction the WDS ought to go in terms of presentation of elements, graphics, source data, bibcodes, etc: http://sb9.astro.ulb.ac.be/DisplayFull.cgi?1481+1 The Hipparcos data appear to apply to the 'C' component. Both Hipparcos and the TASS MkIV database show V = 9.2, which is certainly for the combined light of the system in the latter case. I wonder if the WDS magnitudes need to be rejiggered a bit. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 03492+5023 third component [Skf 109 etc] Date: Thu, 24 Sep 2009 21:44:19 -0700 Looks as though the distant companion 35" ENE of this closer pair shares its substantial proper motion. The visible and near-IR colors are consistent with it being another late-G type member of the system. BD+49 1032 AB: 3 49 13.1 +50 23 17 pmA = 49.3 pmD = -21.1 (Tycho-2) 49.5 -21.6 (UCAC2) UCAC2 48106831: 3 49 16.73 +50 23 23.8 (J2000, UCAC2) pmA = 45.7 pmD = -20.3 (Tycho-2) 48.3 -22.8 (UCAC2) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BD+49 1656 trio Date: Fri, 25 Sep 2009 13:47:29 -0700 The mix of motions for this 44" trio suggest there is a good common-motion pair and a third optical companion. UCAC3 comes in useful here. BD+49 1656 A = TYC 3409-0936-1: 7 40 36.48 +49 30 08.9 (J2000, TRC) pmA = -31.0 pmD = -56.5 (TRC) --- no pm in Tycho-2, so TRC adopted (UCAC3 is okay, too) --- spectral type F8 (Vyssotsky, in 1952CoRut..32....1H) BD+49 1656 B = TYC 3409-0430-1: 7 40 38.76 +49 30 13.3 (J2000, Tyc2) pmA = -31.9 pmD = -58.5 (Tycho-2) -31.2 -58.9 (TRC) --- separation is about 22".7 BD+49 1656 C = TYC 3409-1590-1: 7 40 40.77 +49 30 22.8 (UCAC3) pmA = -10.0 pmD = -3.4 (UCAC3) --- optical companion at about 44" =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 15467-5224 = CPO 444 Date: Wed, 30 Sep 2009 23:29:20 -0700 The early observation in the WDS shows a separation of 2".5 from 1938. Yet the pair appears in the AC from epoch ~1894 with separation 8".4, essentially identical to current values (8".34 in 2MASS). Johansson (1980A&AS...41...43J) gives UBV for the two stars separately from n=2 measurements: V B-V U-B A: 9.84 0.13 0.06 B: 11.51 0.36 0.06 These are not contradictory at least with the pair being physical. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil, jack@stsci.edu, thenry@chara.gsu.edu Subject: New nearby binary M dwarf ? Date: Fri, 02 Oct 2009 14:30:34 -0700 While poking around in some of my lists of Jack MacConnell's late-type stars, I noticed one where the J-K color is too blue if the star is a giant. I previously assumed the type was simply wrong (or for another star), but further investigation shows it is an x-ray source and has modest proper motion, so it is almost certainly a dwarf. DSS/2MASS images show it is a visual binary of about 2" separation in pa ~235. [M81] II-21 = GSC 7890-2050 = AC 3872650 = 3UC 099-326658 = 2MASS J17583642-4059270 = 1RSX J175835.4-405917 17 58 36.43 -40 59 27.0 (J2000, 2MASS) --- V = 11.8 (ASAS-3, sl var) --- spectral type M3e (MacConnell, 1981A&AS...44..387M) --- 2MASS J-Ks = 0.86 If the single-detection AC position is correct, then all the modern catalogues have the proper motion wrong except the PPMX of Roser et al, where it is shown with motion pmA = +10, pmD = -71 mas/year. The usual DSS/2MASS images are close enough in time that they don't show the motion readily. The USNO-Flagstaff pixel-server has the Whiteoak plate-scan from 1964, and that makes the motion obvious in comparison to current images. This should be available until about 20h UT for Oct 3: http://www.nofs.navy.mil/tmp/fchxun01n_se1026.000.jpg This image confirms the old AC position and motion-vector. (Another thank-you to Sean Urban for leaving single detections in the final AC catalogue.) The pair is roughly equal, and if the spectral type is exactly right, then that puts the pair well within the "nearby" realm, at something like 15pc. If the type is one step too late, that moves them out only to ~25pc if I'm figuring right. =============================================================================== From: Brian Skiff To: question@simbad.u-strasbg.fr Cc: arnaud.siebert@astro.unistra.fr, bdm@usno.navy.mil Subject: HD 305940 and comps Date: Mon, 05 Oct 2009 12:27:08 -0700 This is a fairly subtle slip in the Nesterov et al HDE revision. The star indicated on HDE chart 138 as type F8 is a 9" trio. The visually brighter component is however a K-giant per slit spectrum by Beatriz Garcia (1993ApJS...87..197G); for the fainter star (but brighter in blue) she gives F5:V:. Thus it seems the HDE type is for the fainter star of the trio. Though Garcia measured radial velocities for many of the stars in her sample with slit-spectra, these two are not among them. The relatively small delta-V for the brighter pair suggests they are an optical pair, with the F dwarf in the foreground. The fainter very red third component lies about 3" north of the brighter star. It seems likely to be a distant M giant that comes up only in the near-IR, since it is brightest in the 2MASS K-band image. Its connection with the MSX source is not obvious --- the MSX detection could as easily be associated with the K giant (or both stars). CD-59 3519 = CPD-59 2992 = TYC 8627-2803-1 [Tycho-1 only] = NSV 18600 = UCAC2 05565366 = 2MASS J11040821-5948523 11 04 08.20 -59 48 52.9 (J2000, UCAC2) --- not HD 305940 --- V = 10.36, B-V = 1.24, U-B = 1.55 (1993ApJS...87..197G) --- MK type: K2III (1993ApJS...87..197G) HD 305940 = UCAC2 05565356 = 2MASS J11040727-5948583 11 04 07.27 -59 48 58.4 (J2000, UCAC2) --- V = 10.84, B-V = 0.51, U-B = 0.04 (1993ApJS...87..197G) --- MK type: F5:V: (1993ApJS...87..197G) third component: 11 04 08.3 -59 48 50 (J2000, estimate from 2MASS) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Lowell GR* red star doubles Date: Wed, 07 Oct 2009 02:22:04 -0700 I am starting to clean up the red stars of small proper motion from the Lowell proper-motion survey. They were listed only toward the end of the project, and thus are all located toward the south galactic cap. They are designated 'GR* nnn' in SIMBAD; about 500 stars. The first batch of 47 stars appears in 1972LowOB...7..217G. In 2002 I used the charts there to make secure identifications for the stars. At the time I wanted to link the UBV photometry for the same stars by Warren (1976MNRAS.176..667W). The list was sent to Gerard Jasniewicz, who was the SIMBAD 'fixer' at the time. Thus SIMBAD is reasonably clean for these, though I found a few new aliases tonight while going over the list again. Anyway, in 2002 I found that there were three good doubles among these 47. One is known to the WDS: GR* 30 = WDS 01104-1510 = LDS 3239. Two more appear to be new. The first now has Sloan DR7 coverage, remarkably enough, so you can see the images very cleanly separated there: GR* 11 A = SDSS J003153.44-161021.5 = 2MASS J00315345-1610250 = 3UC 148-001216 0 31 53.46 -16 10 25.1 (J2000, 2MASS) --- V = 14.7 (inferred from SDSS DR7 g+r/2) GR* 11 B = SDSS J003153.44-161021.5 = 2MASS J00315343-1610211 = 3UC 148-001215 0 31 53.43 -16 10 21.2 (J2000, 2MASS) --- V = 15.1 (inferred from SDSS DR7 g+r/2) Note the early epoch of the SDSS observations, 1994.9851. On the assumption that the much larger image-scale makes the relative astrometry of the SDSS preferable, and assuming no orbital motion, the separation is 3".9 in pa 354. That seems to match within errors the later 2MASS offset. The pair were not observed photoelectrically by Warren. However, the ASAS-3 database shows V = 14.03 +/- 0.17 for the combined light, reasonably consistent with the sum of the above values (pretty good for a 200mm telephoto lens!). The second pair is GR* 42: GR* 42 A = 2MASS J01175524-3453315 1 17 55.24 -34 53 31.6 (J2000, 2MASS) GR* 42 B = 2MASS J01175498-3453323 1 17 54.98 -34 53 32.4 (J2000, 2MASS) ...from which I infer a separation of 3".3 in pa 256. Various catalogues seem to have picked up on the brighter NE component, so there may a reliable proper motion to be parsed out of them (e.g. the NOMAD entry involving the Yale plates might be okay). The delta-mag seems to be no more than ~1 on the DSS blue plate, but appears larger on the 2MASS images. Warren's photometry for the combined light is: V = 14.58, B-V = 1.52, U-B = 1.14, indicating an early-M dwarf unambiguously. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 16465+4759 = Es 1089 needs attention Date: Fri, 09 Oct 2009 23:04:27 -0700 There are probably a lot of cases like this one that need updating from existing catalogues.... This trio involves a once-close-but-now-wider optical pair and a distant common-motion companion. It also looks as though the incorrect star has been chosen to be the 'A' component in the WDS. Some 'starter' specs are: WDS 16465+4759 A = BD+48 2436 (etc) 16 46 28.63 +47 59 24.1 (J2000, Tycho-2) --- pmA = -37.1 pmD = +88.1 mas/year (Tycho-2) --- spectral type G0 is for this star (from Vysstosky AGK3 survey 1958PMcCO..13b....V) WDS 16465+4759 B = 3UC 276-128727 = 2MASS J16462915+4759150 16 46 29.14 +47 59 15.1 (J2000, UCAC3) --- pmA = +21.0 pmD = -16.0 mas/year (UCAC3) WDS 16465+4759 C = GSC 3503-0373 = 3UC 276-128730 = 2MASS J16463025+4759521 16 46 30.24 +47 59 52.3 (J2000, UCAC3) --- pmA = -22.3 pmD = +84.0 mas/year (UCAC3) -39 +89 (SDSS DR7) -44 +78 (USNO-B1.0) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 54+53 Date: Sat, 10 Oct 2009 00:31:48 -0700 This seems to be an unreported common motion pair from the Lowell proper-motion survey 'GR' stars. The motion is evident by eye by comparing the DSS1/2 blue plates or other. The SDSS DR7 shows 7".6 separation in pa280. The note in the relevant Lowell Bulletin (1973LowOB...7..273G) mentions that they have common motion. ASAS-3 gives combined V = 14.4 +/- 0.3, consistent with the sum of the values I show below from the SDSS photometry. GR* 54 = 3UC 159-001890 = 2MASS J00395501-1051085 (etc) 0 39 55.02 -10 51 08.7 (J2000, SDSS DR7) --- V = 15.2 (inferred from Sloan g+r/2) GR* 53 = 3UC 159-001889 = 2MASS J00395450-1051074 (etc) 0 39 54.51 -10 51 07.4 (J2000, SDSS DR7) --- V = 15.6 (inferred from Sloan g+r/2) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Three more GR* doubles Date: Sat, 10 Oct 2009 13:24:40 -0700 Here are three more pairs from the second group of Lowell GR* stars in the south galactic cap. These are not noted as binaries in the source catalogue (1973LowOB...7..273G). GR* 63 A = 2MASS J00565920-0542071 0 56 59.21 -05 42 07.1 (J2000, 2MASS) GR* 63 B = 2MASS J00565948-0542085 0 56 59.49 -05 42 08.6 (J2000, 2MASS) --- separation 4".4 in pa 110 --- combined V = 14.8 (GSC-2.3 b+r/2); UCAC3 delta-mag = 0.9 --- common motion is not obvious from catalogues in VizieR due to proximity/merging, but best proper motion could be from the Lick NPM1, which gives -11, +41 mas/year --- the two stars are resolved in various sources including NOMAD, Carlsberg CMC14, DENIS, and UCAC3 GR* 112 A = 2MASS J01431772-0151223 1 43 17.72 -01 51 22.4 (J2000, 2MASS) GR* 112 B = 2MASS J01431760-0151265 1 43 17.60 -01 51 26.6 (J2000, 2MASS) --- separation 4".6 in pa 203 (nearly equal brightness) --- combined brightness V = 15.3 (ASAS-3, large uncertainty, but consistent with scattered values from plate-scans and CMC14 r' (which gives 15.42 + 15.49) --- large common motion obvious (USNO-B1.0 motion for the primary is +126,-174 mas/year, which looks about right; B1.0 motion for the secondary is wrong) --- resolved in CMC14, UCAC3, DENIS GR* 114 A = SDSS J014435.92-011144.6 1 44 35.93 -01 11 44.7 (J2000, SDSS DR7) GR* 114 B = SDSS J014435.83-011144.8 1 44 35.83 -01 11 44.8 (J2000, SDSS DR7) --- separation 1".5 in pa ~265 (nearly equal brightness) --- combined brightness V = 13.5 (ASAS-3/TASS MkIII/IV, looks good); Sloan photometry garbled for western star, but probably okay for the eastern component --- close enough that motion from the usual catalogues is okay (UCAC3 looks correct, for instance) and clearly linked comparing DSS1/2 etc by eye --- 12-micron source IRAS Z01420-0127 and 2MASS J-K = 0.93 suggest this is a mid-M binary =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Third comp for HD 8921 Date: Sat, 10 Oct 2009 14:02:51 -0700 Working on the third batch of Lowell GR* stars, Giclas et al (1975LowOB...8....9G) find that a faint M dwarf called GR* 123 has common motion with the bright, close binary HD 8921 = WDS 01278-1054 = Bu 399. It lies about 195" NW of the bright star, which they list as GR* 124. WDS 01278-1054 C = 3UC 159-003943 = 2MASS J01273328-1053442 1 27 33.31 -10 53 44.2 (J2000, UCAC3) --- pmA = +174.6 pmD = +18.3 (UCAC3) +172 +20 (USNO-B1.0) +185.6 +22.1 (Lick NPM1) versus +180.3 +11.6 (Tycho-2 for HD 8921) The offset in the Dec motion is a little worrisome, but the color/delta-mag difference is consistent with the faint star being a physical companion. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 23234-1001 = LDS 2982 Date: Sun, 11 Oct 2009 00:23:20 -0700 This pair is also the Lowell object GR* 208. The WDS has an approximate position, which can be improved for the primary to be: LDS 2983 A = 23 23 28.27 -10 00 43.2 (J2000, UCAC3) The pair was found by Luyten on POSS-I plates, when they were fairly close, but more recent images show the pair is an optical one, with the faint companion being left behind as the primary moves south at nearly 0".2 per year. SDSS DR7 shows the companion with motion -28,+46 mas/year. The Sloan photometry suggests V=17.9 for the fainter star; various sources center at around V=14.6 for the large motion primary. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: More GR* doubles Date: Mon, 12 Oct 2009 13:36:53 -0700 Attached is a plain text file with more pairs resulting from obtaining accurate coordinates for the Giclas et al GR* red stars. These come from the second batch of such plates near the south galactic pole. Some were indeed flagged by them as pairs, which I note in the remarks. If the little blocks of data are too cryptic, do ask for fuller explanation. There are some pairs here that are not well-resolved on images/in catalogues, and those can be set aside if you don't like them (they'll show up again). All the pairs but one seem to be garden-variety M-dwarf binaries. I should note that the substantial motion in every case makes the physical link obvious from comparison of old/new images. In this region of the sky UCAC3 often derives from three or more sets of data, and thanks to the lack of crowding it seems to be quite reliable in most cases. Would you prefer to see the pairs as I find them one at a time, or are batches okay? As I chug through lists variously one mode or the other can be more convenient for me. source list: 1975LowOB...8....9G WDS 23594-1718 = LDS 5149 = GR* 284 --- ASAS-3 combined V = 14.55 +/- 0.30, so Luyten magnitudes should be adjusted fainter by ~0.7 mag GR* 126 A = BD-18 238 = TYC 5852-1028-1 (etc) 1 28 47.72 -17 23 12.9 (J2000, UCAC3) 3UC 146-003699 = 2MASS J01284738-1722536 1 28 47.38 -17 22 53.7 (J2000, 2MASS) --- comp A: pmA = -45.3 pmD = -33.7 (UCAC3) --- comp B: pmA = -38 pmD = -32 (USNO-B1.0) --- separation 19".9 in pa 346 --- V = 10.3 (Tyc2/ASAS-3) + 14.4 (GSC-2.3 g+r/2) GR* 130 A = G 274-61 A = SDSS J013302.36-212732.4 1 33 02.36 -21 27 32.4 (J2000, SDSS DR7) GR* 130 B = G 274-61 B = SDSS J013302.40-212731.6 1 33 02.40 -21 27 31.6 (J2000, SDSS DR7) --- SDSS DR7 coords for 1995.1218 give separation 0".98 in pa 38, but images suggest smaller pa ~20 (?), obviously nearly merged even in the Sloan data --- V = 15.1 + 16.0 (SDSS g+r/2), sums to V=14.7; combined V = 14.4 +/- 0.3 in ASAS-3 --- third component presently ~4" south is optical, is well separated on older DSS plates GR* 138 AB = 3UC 154-004067/68 = 2MASS J01355644-1325472 1 35 56.44 -13 25 47.3 (J2000, 2MASS) --- consistently oval on all DSS and 2MASS images, suggesting separation ~1".5 in pa ~45 --- UCAC3 pair seem to be sorta okay, but motions are obviously different, and delta-m must be neaer zero for it to show up on the DSS/2MASS images; nominally 1".7 in pa 64 (2MASS images suggest pa ~45 and closer?) --- combined V = 13.4 (ASAS-3) GR* 139 AB = 3UC 154-004076 = 2MASS J01360901-1301327 1 36 09.02 -13 01 32.7 (J2000, UCAC3) --- a similar case to GR* 138, where the images are consistently oval on all DSS and 2MASS images, suggesting roughly equal pair with separation ~1".5 in pa ~60 --- not otherwise resolved in catalogues --- combined V = 14.1 (ASAS-3) GR* 155 = 3UC 145-004334 = 2MASS J01444799-1732234 1 44 47.99 -17 32 23.5 (J2000, UCAC3) GR* 154 = 3UC 145-004332 = 2MASS J01444720-1732205 1 44 47.20 -17 32 20.6 (J2000, UCAC3) --- noted by Giclas et al as having common motion --- separation 11".6 in pa 284 --- V = 15.0 + 15.7 (SDSS DR7 g+r/2); combined V = 14.5 +/- 0.3 (ASAS-3) is consistent with sum GR* 197 A = 3UC 151-005146 = SDSS J020528.41-143111.1 2 05 28.41 -14 31 11.2 (J2000, SDSS DR7) GR* 197 B = 3UC 151-005145 = SDSS J020528.25-143109.8 2 05 28.26 -14 31 09.8 (J2000, SDSS DR7) --- nicely resolved especially on SDSS images --- separation 2".7 in pa 302 --- V = 15.5 + 15.7 (SDSS g+r/2); combined V = 14.7 +/- 0.4 (ASAS-3) is consistent with sum GR* 211 A = 3UC 163-307957 = SDSS J232518.88-083701.4 23 25 18.88 -08 37 01.5 (J2000, SDSS DR7) GR* 211 B = SDSS J232519.00-083701.5 23 25 19.00 -08 37 01.6 (J2000, SDSS DR7) --- unequal pair readily visible on SDSS g,r,z images especially; the companion also evident on 2MASS images --- separation 1".8 in pa 86 --- V = 14.7 + 17.5? (SDSS DR7 g+r/2); combined V = 14.6 +/- 0.3 (ASAS-3) GR* 224 = 3UC 156-312081 = 2MASS J23295409-1222329 23 29 54.11 -12 22 33.2 (J2000, UCAC3) GR* 223 = 3UC 156-312079 = 2MASS J23295394-1222378 23 29 53.95 -12 22 38.0 (J2000, UCAC3) --- noted by Giclas et al as having common motion; good large-motion pair in UCAC3 but not flagged as such --- separation 5".4 in pa 206 --- magnitudes a bit uncertain here, but V = 15.2 + 15.5 looks about right; combined V = 14.6 +/- 0.5 (ASAS-3) is consistent GR* 228 = 3UC 151-392753 = 2MASS J23323469-1454029 23 32 34.70 -14 54 03.0 (J2000, UCAC3) 3UC 151-392754 = 2MASS J23323776-1453425 23 32 37.77 -14 53 42.6 (J2000, UCAC3) --- separation 48".9 in pa 65 (UCAC3, epoch 2000.0) 49".4 in pa 66 (USNO-A2.0, epoch 1951.665) --- V = 15.5 + 16.5 (GSC-2.3 b+r/2) --- primary is M dwarf per 2MASS color, but companion is much bluer (J-K=0.3), evidently a cool white dwarf in order to be so faint intrinsically GR* 232 = 3UC 149-412314 = 2MASS J23341101-1531012 = 1RSX J233410.9-153053 23 34 11.02 -15 31 01.1 (J2000, UCAC3) GR* 231 = 3UC 149-412308 = 2MASS J23340586-1532195 = NLTT 823-17 23 34 05.87 -15 32 19.4 (J2000, UCAC3) --- noted as common-motion pair by Giclas et al, perhaps Luyten also? --- separation 108".0 in pa 223 --- V = 12.0 (ASAS-3) + 15.5 (GSC-2.3 g+r/2) --- primary is given with [Fe/H] = -3.0 by Christlieb et al; Riaz et al show the spectral type as M0 (both per VizieR listing) GR* 241 A = 3UC 160-300377 = 2MASS J23380345-1008173 = SDSS J233803.46-100817.1 23 38 03.47 -10 08 17.2 (J2000, SDSS DR7) GR* 241 B = SDSS J233803.51-100819.7 23 38 03.51 -10 08 19.7 (J2000, SDSS DR7) --- unequal pair resolved on SDSS images and 2MASS J; --- separation 2".6 in pa 167 --- V = 15.3 + 18.1 (SDSS DR7 g+r/2) GR* 244 A = 3UC 163-308767 = 2MASS J23394339-0852348 = SDSS J233943.41-085234.6 23 39 43.41 -08 52 34.6 (J2000, UCAC3) GR* 244 B: 23 39 43.37 -08 52 36.1 (J2000, estimate from four SDSS images using SkyView) --- unequal pair resolved on SDSS images, oval on 2MASS J and DSS1 blue --- separartion ~2".5 in pa ~215 --- V = 15.0 (SDSS g+r/2) + 18? (delta-m similar to GR* 241 above) GR* 247 A = 3UC 161-291833 = 2MASS 23413495-0948006 = SDSS J234135.00-094800.6 23 41 34.99 -09 48 00.7 (J2000, UCAC3) GR* 247 B = SDSS J234134.84-094801.7 23 41 34.84 -09 48 01.7 (J2000, SDSS DR7) --- evident on DSS and SDSS images, moderate delta-m --- separation 2".5 in pa 244 --- V = 15.1 + 16.6 (SDSS g+r/2); combined V = 14.6 +/- 0.4 (ASAS-3) GR* 250 A = 3UC 155-333029 = 2MASS J23434779-1252521 23 43 47.80 -12 52 52.1 (J2000, UCAC3) 3UC 155-333031 = 2MASS J23434887-1252426 23 43 48.89 -12 52 42.6 (J2000, UCAC3) --- separation 18".5 in pa 59 --- V = 14.0 (ASAS-3) + 16.3 (GSC-2.3 g+r/2) GR* 258 AB = 3UC 157-296865/66 = 2MASS J23472150-1135590 23 47 21.5 -11 35 59 (J2000, UCAC3/2MASS) --- equal pair evident on DSS/2MASS images, UCAC3 not quite resolved --- estimated separation 2".6 in pa 235 from 2MASS J image using SkyView --- V = 14.5 + 14.5, assumed equal, combined V = 13.8 (ASAS-3) GR* 259 A = 3UC 160-300887 = 2MASS J23482354-1017432 = SDSS J234823.56-101743.0 23 48 23.56 -10 17 43.2 (J2000, UCAC3) GR* 259 B = SDSS J234823.38-101743.5 23 48 23.39 -10 17 43.5 (J2000, SDSS DR7) --- unequal pair resolved in SDSS images, oval on DSS/2MASS images --- separation 2".6 in pa 265 --- V = 15.7 + 18.1 (SDSS g+r/2) GR* 266 = 3UC 153-373678 = 2MASS J23513256-1344012 23 51 32.55 -13 44 01.4 (J2000, UCAC3) 3UC 153-373677 = 2MASS J23513064-1343516 23 51 30.62 -13 43 51.8 (J2000, UCAC3) --- separation 29".7 in pa 289 --- V = 15.0 + 16.1 (GSC-2.3 g+r/2) GR* 274 = 3UC 148-395250 = 2MASS J23553081-1606090 23 55 30.83 -16 06 09.0 (J2000, UCAC3) GR* 273 = 3UC 148-395249 = 2MASS J23553075-1606161 23 55 30.77 -16 06 15.9 (J2000, UCAC3) --- noted by Giclas et al as having common motion --- separation 7".0 in pa 187 --- V = 15.6 + 16.7 (GSC-2.3 b+r/2) GR* 286 AB = 3UC 156-000031 = 2MASS J00003945-1215527 0 00 39.47 -12 15 52.9 (J2000, UCAC3) --- unequal pair evident on 2MASS images --- separation ~3" in pa ~350 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-45 4852 is double Date: Mon, 12 Oct 2009 23:14:03 -0700 This star appears to be a ~2" pair especially on 2MASS images. Position angle is about 350 deg. It is possible that the Tycho-2 position applies only to the southern component, since it lies somewhat south of others where you might expect them to record a photo-center. Though not outside its usual photometric errors at this magnitude, the Tycho-2 magnitudes are also about what you'd expect for just one of the stars. CD-45 4852 = CPD-45 3423 = TYC 8165-0981-1 9 05 39.49 -45 33 15.1 (J2000, Tycho-2 for primary?) --- combined V = 11.03 +/- 0.03 (ASAS-3) --- spectral type F4V (1988AJ.....96..988S) --- GSC-2.3 shows entry at 2".15 in pa 336 wrt Tycho-2, spurious? --- other astrometry centered ~0".8 N of Tycho-2 position, suggesting separation ~1".6 if the pair is equal =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: 3UC 086-070554/55 confirmed Date: Tue, 13 Oct 2009 00:30:12 -0700 This pair is confirmed on DSS/2MASS images as a 2" pair in about pa 45. Combined V = 13.01 +/- 0.08 per ASAS-3. Slawson gives the spectral type as G2III: (1988AJ.....96..988S), and notes that the star is double. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-46 5016 is a pair Date: Tue, 13 Oct 2009 12:22:38 -0700 Another case from the Slawson thesis paper (1988AJ.....96..988S) flagged as double there, and shown with separate entries in UCAC3. Also double on DSS/2MASS images. The UCAC3 motion for the SW component is probably correct, while the other star has 'radial' motion away from the first star. CD-46 5016 = CPD-46 3503 = 3UC 086-072527/29 (etc) 9 13 59.62 -47 23 34.3 (J2000, UCAC3 for SW comp) --- nearly equal brightness, combined V = 11.96 +/- 0.05 (ASAS-3) --- separation 3".4 in pa 37 (using 2MASS astrometry) --- spectral type F6III (1988AJ.....96..988S) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-46 5017 is double Date: Tue, 13 Oct 2009 12:44:01 -0700 Slawson's Curtis Schmidt plates must have been taken with excellent seeing, since this rather unequal pair is also marked as double by him (1988AJ.....96..988S). CD-46 5017 = CPD-46 3504 = 3UC 086-072555 = 2MASS J09141071-4722594 9 14 10.72 -47 22 59.5 (J2000, UCAC3) 2MASS J09141093-4723033 9 14 10.94 -47 23 03.4 (J2000, 2MASS) --- separation 4".5 in pa 150 (2MASS offset) --- combined V = 11.64 +/- 0.04 (ASAS-3); also photoelectric V = 11.66, B-V = 0.43 (1999PASP..111.1169W) --- the spectral there (F5V) is from DDO photometry not a spectrum --- spectral type for primary F2V (1988AJ.....96..988S) --- 2MASS delta-J = 2.6 probably a minimum since companion is somewhat redder, though consistent with being physical =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-47 4626 optical? pair Date: Tue, 13 Oct 2009 13:12:57 -0700 Another pair noted by Slawson (1988AJ.....96..988S) that I'm guessing is probably optical. He gives the type as K0V, but it seems the NE component is relatively faint in the blue, but brightens significantly in the 2MASS J image. The 2MASS colors suggest the type is a poor compromise, but "more data are required". The most likely thing statistically is a foreground F/G dwarf plus background K giant. CD-47 4626 A = CPD-47 3042 A = 3UC 084-065441 = 2MASS J09040925-4819464 9 04 09.25 -48 19 46.4 (J2000, UCAC3) CD-47 4626 B = CPD-47 3042 B = 3UC 084-065442 = 2MASS J09040947-4819430 9 04 09.48 -48 19 43.0 (J2000, UCAC3) --- 2MASS coords might be preferred, though only a very slight difference --- separation 4".0 in pa 34 (2MASS offsets) --- NE component has J-K = 1.0, so it is the brighter star at J --- 11.78 +/- 0.04 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-47 4689 is double Date: Tue, 13 Oct 2009 13:24:49 -0700 Another nice Slawson pair, but close enough and large-enough delta-mag that it is not resolved in astrometric catalogues. CD-47 4689 = 3UC 084-066090 = 2MASS J09090649-4818338 9 09 06.50 -48 18 34.0 (J2000, UCAC3) --- estimated separation ~2".5 in pa 235 --- combined V = 10.98 +/- 0.05 (ASAS-3); also photoelectric V = 10.98, B-V = 1.30 (1999PASP..111.1169W); Westpfahl also show type G4Ib/II from DDO photometry --- spectral type G5 (1988AJ.....96..988S) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: [SR88] 24036 is double Date: Tue, 13 Oct 2009 13:38:46 -0700 Another good Slawson pair that is a little fainter than the CD/CPD limits. Nicely oval/partly resolved on DSS/2MASS images, and also in astrometric catalogues (UCAC2 gives a photo-center). [SR88] 24036 A = 3UC 084-066106 = 2MASS J09091575-4803580 9 09 15.75 -48 03 58.1 (J2000, UCAC3) [SR88] 24036 B = 3UC 084-066105 = 2MASS J09091547-4803584 9 09 15.75 -48 03 58.19 (J2000, UCAC3) --- separation 2".8 in pa 264, though nearly equal --- combined V = 12.04 +/- 0.05 (ASAS-3); also photoelectric V = 12.05, B-V = 0.55 (1999PASP..111.1169W) --- spectral type G0 (1988AJ.....96..988S) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 08577-4605 = CPO 244 Date: Tue, 13 Oct 2009 14:13:07 -0700 Though similarly bright in the blue, this is actually a red/blue pair, and the 2MASS images/catalogue show a third component to the south. The WDS spectral type F5 is a compromise type coming probably from the old 1939 'Cape Faint' catalogue, where non-HD types were supplied by Cannon. Slawson (1988AJ.....96..988S) gives type A2V, which is clearly only for the secondary star on the NW. The various photometric colors suggest the primary is a K giant; it is also an MSX6C source. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 08579-4613 = Brt 756 Date: Tue, 13 Oct 2009 14:26:16 -0700 The Barton pair is the southwestern two stars of a trio. The third component lies 11".5 NE of the SW-most star, and is quite red, presumably a background M giant. It is readily visible however on the short-V DSS plate-scan. Slawson (1988AJ.....96..988S) gives the spectral type for the Barton pair as G8III:, which looks good enough wrt 2MASS colors. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-46 4831 is a pair Date: Tue, 13 Oct 2009 14:57:03 -0700 A relatively wide pair noted by Slawson (1988AJ.....96..988S). UCAC2/3 and 2MASS colors suggest "maybe" a physical pair. CD-46 4831 A = CPD-46 3319 A = 3UC 087-072882 = 2MASS J09004589-4638094 9 00 45.89 -46 38 09.5 (J2000, UCAC3) CD-46 4831 B = CPD-46 3319 B = 3UC 087-072884 = 2MASS J09004636-4638058 9 00 46.36 -46 38 05.8 --- separation 6".1 in pa 53 --- combined V = 11.26 +/- 0.03 (ASAS-3); Tycho-2 V=11.8 for primary --- spectral type B9V (1988AJ.....96..988S, probably for primary) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: [SR88] 16019 is double Date: Tue, 13 Oct 2009 15:23:32 -0700 Another Slawson pair (1988AJ.....96..988S) with accordant colors and (possibly) proper motion. [SR88] 16019 A = 3UC 086-069778 = 2MASS J08551915-4716277 8 55 19.16 -47 16 27.8 (J2000, UCAC3) [SR88] 16019 B = 3UC 086-069779 = 2MASS J08551919-4716337 8 55 19.20 -47 16 33.8 (J2000, UCAC3) --- separation 6".1 in pa 176; UCAC2 motion almost consistent, but UCAC3 motion divergent --- combined V = 12.11 +/- 0.04 (ASAS-3) --- spectral type A0V (1988AJ.....96..988S) for combined light --- both stars in AC2000 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 78581 is double Date: Tue, 13 Oct 2009 19:05:33 -0700 This one has some promise mainly due to the companion having color consistent with a possible physical association with the bright star. I note that this has been recorded in the classical astrometric catalogues at least since the 1936 Cape Zone catalogue; also resolved in AC2000, so it's not really "new". HD 78581 A = TYC 8169-0361-1 = 2MASS J09071619-4752261 9 07 16.19 -47 52 26.1 (J2000, UCAC2) HD 78581 B = 2MASS J09071637-4752200 9 07 16.37 -47 52 20.1 (J2000, 2MASS) --- UCAC3 positions look mixed a bit (and 'radial motion' secondary) [WDS flags it in error as non-cpm] --- separation 6".3 in pa 17 --- combined V = 9.20 +/- 0.03 (ASAS-3) --- spectral type A3IV (Houk, 1978MSS...C02....0H) A2V (1988AJ.....96..988S) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-47 4726 is cpm pair Date: Tue, 13 Oct 2009 19:41:27 -0700 Almost the last one from the Slawson thesis survey: CD-47 4726 A = CPD-47 3138 A = TYC 8170-0073-1 = UCAC2 11043187 = 3UC 084-066340 = 2MASS J09113185-4801594 9 11 31.86 -48 01 59.5 (J2000, UCAC2) CD-47 4726 B = CPD-47 3138 B = UCAC2 11043186 = 3UC 084-066339 = 2MASS J09113161-4801526 9 11 31.62 -48 01 52.7 (J2000, UCAC2) --- UCAC3 motions discordant with Tycho-2 and UCAC2 --- separation 7".2 in pa 340 --- V = 11.3 + 11.9; combined V = 10.81 +/- 0.03 (ASAS-3); delta-mag 0.6 from UCAC2/3, 2MASS --- spectral type F7 (1988AJ.....96..988S) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-47 4788 is double Date: Tue, 13 Oct 2009 19:54:29 -0700 The last one for now: CD-47 4788 A = CPD-47 3191 A = 3UC 085-074482 = 2MASS J09153257-4756075 9 15 32.58 -47 56 07.7 (J2000, UCAC3) CD-47 4788 B = CPD-47 3191 B = 3UC 085-074480 = 2MASS J09153177-4756080 9 15 31.77 -47 56 08.1 (J2000, UCAC3) --- separation 8".1 in pa 268 --- V = 11.7 + 13.1; combined V = 11.40 +/- 0.04 (ASAS-3); assumes delta-mag = 1.4 from UCAC3 --- spectral type A5V (1988AJ.....96..988S) for primary only --- UCAC3 shows the secondary and a spurious mag 16 object with the '5,6' double-star flag =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 01359-2916 = LDS 2216 Date: Tue, 13 Oct 2009 21:53:52 -0700 Back to the third Lowell 'GR*' red stars list. In it GR* 300 is also WDS 01359-2916 = LDS 2216. Between the POSS-I blue and later plates the separation hasn't changed much but there seems to be significant orbital motion. The 2MASS observation from 1999 Jul 24 shows a separation of 6".4 in pa 83 --- about 40 deg motion since the POSS-I plates. The various Schmidt plate-scans suggest the secondary isn't quite as faint as Luyten gives, even in the blue. V mags are: 15.3 + 17.7 (Yale SPM). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 302 + 301 Date: Tue, 13 Oct 2009 22:14:02 -0700 These were noted by Giclas et al as a common-motion pair. I'm showing the eastern component as the primary based on GSC-2.3, Carlsberg, DENIS, and 2MASS magnitudes, but they are very close. GR* 302 = 3UC 134-004130 = 2MASS J01360269-2329344 1 36 02.70 -23 29 34.5 (J2000, UCAC3) GR* 301 = 2MASS J01360185-2329369 1 36 01.86 -23 29 36.9 (J2000, 2MASS) --- separation 11".8 in pa 258 --- V = 15.8 + 15.8, combined V = 15.0 (ASAS-3, barely detected) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 317 is cpm pair Date: Tue, 13 Oct 2009 22:50:07 -0700 The secondary here was probably a little too close/too faint to have been noticed on the 'Pluto Camera' plates by Giclas et al, but then again Luyten missed it, too. GR* 317 A = 3UC 116-003925 = 2MASS J01434603-3218560 1 43 46.04 -32 18 56.1 (J2000, UCAC3) GR* 317 B = 2MASS J01434594-3218490 1 43 45.94 -32 18 49.0 (J2000, 2MASS) --- separation 7".1 in pa 351 --- V = 15.2 + 16.9 (GSC-2.3 b+r/2); combined V = 15.0 +/- 0.5 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 01581-2319 = LDS 3328 Date: Tue, 13 Oct 2009 23:57:27 -0700 UCAC3 and USNO-B1.0 (plus UCAC2 for the secondary) show that this wide pair do not have common motion. Also, while the primary has 2MASS J-K = 0.84, i.e. an M dwarf, the secondary has J-K = 0.54, corresponding to an early-K dwarf. added 2011 Mar 11: theta rho epoch source 19.7 70.25 1977.925 SuperCOSMOS UK Schmidt IIIa-J plate 19.8 70.44 1981.408 USNO-A2.0 19.8 70.14 1996.690 DENIS 19.7 70.18 1996.921 GSC-2.3 19.8 70.08 2005.033 CMC14 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords/ID for WDS 06009+2356 = Cou 717 Date: Thu, 15 Oct 2009 01:02:59 -0700 Working on a trimmed list of the 'neglected pairs', I'm pretty sure Cou 717 is: WDS 06009+2356 = HD 250220 = TYC 1864-0977-1 = 3UC 228-048397 = 2MASS J06005482+2356189 6 00 54.8 +23 56 19 (J2000, UCAC3) --- oval in the correct pa on 2MASS images --- combined V = 11.0 +/- 0.08 (TASS MkIV) implies the WDS mags need to be adjusted fainter by ~1.2 mag --- HD type G0; McCuskey type F5V (1967AJ.....72.1199M ) is more consistent with photometric colors =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: J 1094 = TDS 3932 Date: Thu, 15 Oct 2009 01:20:50 -0700 These two pairs, nominally ~2'.5 apart, appear to be the same object with nearly identical micrometric specs. On DSS/2MASS images, the TDS pair is readily recognizable, whereas the Jonckheere star is circular (and rather red). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 21389+4249 = J 1232 recovered ? Date: Thu, 15 Oct 2009 01:45:13 -0700 If this is correct, then it is rather fainter than advertised (not so unusual for Jonckheere?). WDS 21389+4249 = GSC 3191-1244 = 3UC 266-231759/58 = 2MASS J21384850+4250267 21 38 48.5 +42 50 26 (J2000, UCAC3) --- combined V = 11.95 +/- 0.11 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 06214+2203 = L 58 recovered ? Date: Fri, 16 Oct 2009 15:19:20 -0700 This pair seems to be not far from the nominal place, but also seems to make it equivalent to WDS 06214+2202 = L 59. Much fainter than advertised, as usual. I don't see the 6";pa312 pair in a 9'x9' DSS field. WDS 06214+2203 = HD 255587 = BD+22 1293 6 21 23.80 +22 02 05.5 (J2000, UCAC3) --- combined V = 10.8 (ASAS-3, TASS MkIV) --- HD type G0 Very distracted, as usual, so still chipping away on an observing list. Looks as though doing selections for 'neglected' pairs in the WDS is easier with VizieR. The list on the WDS pages doesn't match the current version: lots of things fixed in the latter --- no longer neglected! =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 05237+0002 = OL 56 recovered Date: Fri, 16 Oct 2009 16:52:17 -0700 This guy appears to be: WDS 05237+0002 = HD 290346 = TYC 0101-1704-1 5 23 51.17 +00 00 11.9 (J2000, Tycho-2) --- combined V = 11.7 (ASAS-3, TASS MkIII/IV) --- HD type A7 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 05253+3704 Date: Fri, 16 Oct 2009 16:55:13 -0700 Much fainter than advertised: combined V = 12.82 +/- 0.11 from TASS MkIV. Coords are okay. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 05363+3624 magnitude Date: Fri, 16 Oct 2009 17:00:58 -0700 Combined V = 12.80 +/- 0.11 (TASS MkIV). Coords etc okay. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 06122+2357 = J1051 recovered Date: Fri, 16 Oct 2009 23:00:32 -0700 This pair is apparently: WDS 06122+2357 = BD+23 1244 = TYC 1877-0916-1 6 12 03.6 +23 56 49 (J2000, Tycho-2) --- combined V = 10.6 +/- 0.06 (TASS MkIV) --- spectral type F0 (1967AJ.....72.1199M) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 06138+3509 = 06141+3505 Date: Fri, 16 Oct 2009 23:21:52 -0700 These two entries appear to be the same object, although there seems to be a discrepancy on the 4".4 separation from the GCB 16 observation. The coordinates for Ali 85 are certainly for the wrong star in any case (as reported in 2006AJ....132...50W). There is also a fair bit of modern astrometry for the pair. WDS 06138+3509 = WDS 06141+3505 --- combined V = 11.13 +/- 0.06 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 06235+2303 = J 976 mis-ID Date: Fri, 16 Oct 2009 23:28:36 -0700 I'm pretty sure the wrong star has been identified with this pair. The current WDS coords point to an M giant. I think the correct pair is ~1'.5 south. Oddly, the CCDM has it (nearly) correct. Components about 3 mags fainter than WDS shows. WDS 06235+2303 = GSC 1878-0871 = GSC2.3 N8JS000291 6 23 29.1 +23 02 29 (J2000, GSC-2.3) --- combined V = 11.84 +/- 0.06 (TASS MkIV) 11.81 +/- 0.05 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords for WDS 06269+1227 = J 978 Date: Fri, 16 Oct 2009 23:34:24 -0700 This one is pretty close to nominal, but fainter than advertised. WDS 06269+1227 = GSC 0740-0446 (etc) 6 26 54.33 +12 26 50.9 (J2000, 2MASS for primary) --- combined V = 11.17 +/- 0.07 (TASS MkIV) 11.17 +/- 0.05 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords for WDS 06306+1139 = J 979 Date: Fri, 16 Oct 2009 23:42:28 -0700 Not too far off. Fainter and delta-m larger than advertised. WDS 06306+1139 = GSC 0740-0937 (etc) 6 30 34.20 +11 40 00.8 (J2000, 2MASS for primary) --- 10.90 +/- 0.05 (ASAS-3) 10.92 +/- 0.09 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Coords for WDS 06410+0215 = J 596 Date: Fri, 16 Oct 2009 23:55:37 -0700 Not the BD star, but the companion ~1' SE. Vizier shows astrometry from the AC onward. WDS 06410+0215 = HD 288955 = TYC 0151-2096-1 etc 6 41 03.8 +02 14 22 (J2000, Tycho-2) --- V = 10.14 +/- 0.10 (TASS MkIV) 10.16 +/- 0.04 (ASAS-3) --- HD type F0 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 06540+0825 = J 270 recovered Date: Sat, 17 Oct 2009 00:26:16 -0700 A few arcminutes off; faint third component on east side. Trio resolved in CMC14, 2MASS, UCAC3. WDS 06540+0825 = GSC 0748-1570 (etc) 6 54 03.7 +08 23 26 (J2000, 2MASS) --- combined V = 12.03 +/- 0.06 (ASAS-3) 12.12 +/- 0.08 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 06545+0820 = J 272 magnitudes Date: Sat, 17 Oct 2009 00:29:09 -0700 Coordinates etc okay, just much fainter than advertised: combined V = 11.74 +/- 0.13 (TASS MkIV) 11.78 +/- 0.11 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 06585+1343 = J1058 recovered Date: Sat, 17 Oct 2009 00:46:21 -0700 ...with good coordinates anyways; much fainter of course too. Ah: is TDSC 17328, so you already have it. WDS 06585+1343 = WDS 06583+1341 = TYC 0760-0394-1 (etc) --- combined V = 10.87 +/- 0.08 (TASS MkIV) 10.82 +/- 0.05 (ASAS-3) ... TDSC V mags are okay =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 07265+0923 = 07266+0926 Date: Sat, 17 Oct 2009 01:01:41 -0700 Almost certainly these two entries are the same. Looks as though the NE component is a red variable, roughly equal visually, but slightly fainter in the blue and much brighter toward the red. WDS 07266+0926 = J2631 = WDS 07265+0923 = J1064 = TYC 0768-0093-1 7 26 29.0 +09 25 02 (J2000, Tycho-2) --- combined mean V = 11.26 +/- 0.14 (TASS MkIV, variable) 11.06 +/- 0.08 (ASAS-3 variable) ASAS-3 lightcurve shows full amplitude ~0.3 mag, so perhaps double that for the red component alone(?) --- red component = IRAS F07237+0931 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 15142+2000 = Cou 102 recovered Date: Sat, 17 Oct 2009 11:37:28 -0700 This one is just recognizable on the SDSS u image. Note also that it has common proper motion with the brighter pair BD+20 3083 = WDS 15143+1959 = Cou 27. Apparently also noticed by John Greaves, thus his Grv 899 AC = Cou 102 (AB). The brighter pair is an Hipparcos star, so in principle Cou 102 is known too. WDS 15142+2000 = TYC 1489-1186-1 (etc) 15 14 14.6 +19 59 11 (J2000, Tycho-2) --- combined V = 11.25 +/- 0.05 (ASAS-3) 11.21 +/- 0.06 (TASS MkIV) --- TASS V-I = 0.8 and 2MASS J-K = 0.48 imply late-G dwarf type, consistent with the spectral type/delta-mag of the BD pair =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 18218+2115 = Fur 4 recovered Date: Sat, 17 Oct 2009 11:58:04 -0700 Easy to identify using DSS/2MASS images: WDS 18218+2115 = GSC 1580-1762 = 3UC 223-153939/40 18 21 51.9 +21 14 57 (J2000, UCAC3) --- combined V = 12.66 +/- 0.08 (ASAS-3) 12.70 +/- 0.15 (TASS MkIV) ...another similar pair in the same field that seems to be new: GSC 1580-1081 = 3UC 223-153897/96 = 2MASS J18214775+2117027 18 21 47.7 +21 17 03 (J2000, UCAC3+2MASS) --- separation 2".4 in pa348 from UCAC3 coords --- sep looks okay, but 2MASS image suggests pa ~320 probably more nearly correct --- combined V = 12.97 +/- 0.10 (ASAS-3) [TASS is noisy] =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 18549+0716 = J1275 recovered Date: Sat, 17 Oct 2009 12:06:50 -0700 Not far from nominal, and fainter: WDS 18549+0716 = TYC 0461-0271-1 = 3UC 195-202205/06/07 18 54 54.2 +07 14 51 (J2000, 2MASS) --- combined V = 11.77 +/- 0.08 (TASS MkIV) 11.76 +/- 0.05 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 18560+1119 = J1277 recovered Date: Sat, 17 Oct 2009 12:23:45 -0700 Again not far from nominal. Images suggest the pa should be pa 239 rather than 59. WDS 18560+1119 = AG+11 2174 (but not BD+11 3671) = TYC 1047-0561-1 18 56 00.5 +11 19 29 (J2000, Tycho-2) --- combined V = 11.31 +/- 0.11 (TASS MkIV) 11.36 +/- 0.05 (ASAS-3) --- relatively blue in color; BD+11 3671 is M-giant about 1'.5 north; CCDM identifies the double correctly evidently through the list by Bacchus (1988BICDS..35...65B) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 19068+1854 = J1142 coords Date: Sat, 17 Oct 2009 12:44:54 -0700 Improved coords, much fainter than advertised: WDS 19068+1854 = TYC 2130-1913-1 = 3UC 236-159744 19 03 08.3 +27 56 45 (J2000, UCAC3) --- combined V = 11.30 +/- 0.08 (TASS MkIV) 11.27 +/- 0.04 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 19068+1854 = J1142 recovered Date: Sat, 17 Oct 2009 12:53:11 -0700 A couple arcminutes out and fainter, as usual. WDS 19068+1854 = HD 230700 = GSC 1594-0592 = 3UC 218-195163 19 06 46.4 +18 56 11 (J2000, UCAC3) --- combined V = 10.95 +/- 0.08 (TASS MkIV) 10.93 +/- 0.03 (ASAS-3) --- HD type A5 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on 19117+0533 = J1377 Date: Sat, 17 Oct 2009 12:57:34 -0700 This one has correct coords in the WDS, but is wide enough that there is a fair bit of modern astrometry. ASAS-3 and TASS MkIV give combined V = 11.30. 292.3 5.60 1999.608 2MASS 292.1 5.47 2000.830 CMC14 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 19277+4053 = Es 1664 coords/ID error Date: Sat, 17 Oct 2009 13:06:26 -0700 The WDS indicates the wrong star, and the pair lies ~1'.5 E, is much fainter and etc. WDS 19277+4053 = TYC 3138-1287-1 = 3UC 262-163492/93 19 27 45.7 +40 52 58 (J2000, Tycho-2) --- not BD+40 3734 etc --- combined V = 11.34 +/- 0.08 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 19309+1137 = OL 64 CD Date: Sat, 17 Oct 2009 13:18:44 -0700 Not sure whether a better position for the CD pair is needed. This one has some modern astrometry as well. Coords for the AB pair are okay (and the pair is not spurious as per the WDS note!); the spectral type 'M' applies to the bright star off to the north, which was perhaps Olivier's original ID. WDS 19309+1137 CD = GSC 1063-0093 = 3UC 204-227959/62 19 30 49.7 +11 35 16 (J2000, UCAC3) --- combined V = 11.48 +/- 0.15 (TASS MkIV) 11.48 +/- 0.04 (ASAS-3) =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: Re: WDS 19068+1854 = J1142 coords Date: Sat, 17 Oct 2009 13:53:05 -0700 Sorry, boss! Yes, this was my goof from going too fast. The wrong new coords apply instead to WDS 19031+2757 = J 811 (one line up in the VizieR output I'm working from): WDS 19031+2757 = TYC 2130-1913-1 = 3UC 236-159744 > > 19 03 08.3 +27 56 45 (J2000, UCAC3) > > > > --- combined V = 11.30 +/- 0.08 (TASS MkIV) > > 11.27 +/- 0.04 (ASAS-3) I'm working from a VizieR selection between 1" and 5", and between mag 8 and 10 with last measurement < 1990. I've omitted sending you the "not found" pairs (not in 9'x9' DSS/2MASS field). I notice a big gap between about 8h and 18h --- did someone work all these over or something? At first I thought how convenient: that's close to the Sun right now and not observable anyways. If the weather holds up I ought to be able to blast through just about everything that is correctly located in the WDS. On Sat, 2009-10-17 at 16:24 -0400, Brian D. Mason wrote: > Dude, stop for air, you're wearing me out! :-) > > The coordinates you give seem off. 19068+1854 = 19 03 08.3 +27 56 45 ??? > > > Brian =============================================================================== From: Brian Skiff To: Brian D. Mason Subject: Re: WDS 19068+1854 = J1142 coords Date: Sat, 17 Oct 2009 13:57:39 -0700 On Sat, 2009-10-17 at 16:55 -0400, Brian D. Mason wrote: > I don't recall somebody doing that. The WDS is thinnest in those hour > batches. > > I notice a big gap between about 8h and 18h --- did someone work > > all these over or something? Makes sense, since I limited the search from Dec +0 to +60, that's the north galactic cap obviously, so far fewer stars. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 19576+3914 = J1069 coords improvement Date: Sat, 17 Oct 2009 14:04:56 -0700 Not far off. The secondary is pretty red, so there's a position-angle flip between the visible and near-IR images. Probably means it's optical with the M giant in the background. WDS 19576+3914 = GSC 3137-0822 = 3UC 259-178706/09/12 19 57 38.7 +39 14 23 (J2000, various) --- combined V = 12.56 +/- 0.15 (TASS MkIV) --- secondary = 2MASS J19573859+3914216, J-K = 1.22 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 20025+0601 = J1294 coords improvement Date: Sat, 17 Oct 2009 14:12:43 -0700 Again not too far off, and fainter: WDS 20025+0601 = TYC 0506-0786-1 (etc) 20 02 31.4 +06 01 32 (J2000, Tycho-2) --- combined V = 12.18 +/- 0.06 (ASAS-3) 12.13 +/- 0.12 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 20153+2120 = J3067 coords improvement Date: Sat, 17 Oct 2009 14:26:45 -0700 Maybe still some mix-up here with the old pa 41 observation, but the ~6".5 pair in pa 140 is at: WDS 20153+2120 = GSC 1630-0235 = 3UC 223-252034/36 (etc) 20 15 08.24 +21 22 03.3 (J2000, UCAC3 for primary) --- combined V = 11.33 +/- 0.09 (TASS MkIV) 11.33 +/- 0.03 (ASAS-3) --- UCAC3 shows common proper motion, and there is other modern astrometry (CMC14, 2MASS etc) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: ID? for WDS 20227+1345 = J3079 Date: Sat, 17 Oct 2009 14:43:23 -0700 The current WDS ID for this pair is certainly wrong, but the new ID is maybe uncertain. Jonckheere did publish some separations that were only estimates, right? The likely pair seems to be a bit to the west and somewhat wider and about as faint as usual. WDS 20227+1345 = 3UC 208-277164/68 (numerous older IDs and astrometry) 20 22 29.81 +13 45 35.3 (J2000, UCAC3 for primary) --- combined V = 12.23 +/- 0.11 (TASS MkIV) 12.20 +/- 0.05 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 20257+3745 = Fox 36 coords improvement Date: Sat, 17 Oct 2009 14:48:52 -0700 A nice pair readily identifiable on DSS/2MASS images. WDS 20257+3745 = TYC 3152-1058-1 (etc) 20 25 46.24 +37 46 08.0 (J2000, Tycho-2 for primary) --- combined V = 10.90 +/- 0.07 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 20392+3910 = Mlb 954 ID/coords Date: Mon, 19 Oct 2009 12:34:44 -0700 This will be the first item in the last batch for the starter observing list for this week (I head to the telescope in a few hours!) WDS 20392+3910 seems to be mis-identified --- it is not BD+38 4175, and lies a couple arcminutes east: WDS 20392+3910 = GSC 3153-1075 = 3UC 259-204186/87/88 2MASS J20391728+3910241 20 39 17.3 +39 10 24 (J2000, 2MASS) --- combined V = 12.6 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 20436+1537 = J3108 recovered Date: Mon, 19 Oct 2009 12:40:12 -0700 This one is ~2'.5 from nominal, and though only somewhat fainter than advertised, is wide enough to have modern astrometry (well observed by CMC14 as well as 2MASS): WDS 20436+1537 = TYC 1634-0539-1 (etc) 20 43 43.0 +15 38 59 (J2000, Tycho-2) --- combined V = 10.9 (ASAS-3,TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: ID error for WDS 20492+4525 ? Date: Mon, 19 Oct 2009 12:47:39 -0700 Images suggest the 4" pair can't be the bright early-B star, but is instead the fainter pair a couple arcminutes west. Thus the close binary Cou 2646 is a separate object from the SMA pair. WDS 20492+4525 = GSC 3575-1534 = 3UC 271-196236/30 20 48 59.8 +45 25 04 (J2000, UCAC3) --- combined V = 11.7 (TASS MkIV) --- I get 4".3 in pa313 from 2MASS astrometry =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 20560+0837 = J1346 recovered Date: Mon, 19 Oct 2009 12:51:11 -0700 About 75" off in the WDS. WDS 20559+0835 = J 157 is okay in the same field. WDS 20560+0837 = TYC 1090-0250-1 = 3UC 198-295104/03 20 56 00.2 +08 35 47 (J2000, UCAC3) --- combined V = 11.8 (ASAS-3, TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 20576+3003 = J2333 recovered Date: Mon, 19 Oct 2009 12:54:29 -0700 Some modern astrometry is available for this pair. WDS 20578+3002 = TYC 2688-3548-1 = 3UC 241-268094/96 (etc) 20 57 35.8 +30 00 54 (J2000, UCAC3 for primary) --- combined V ~12.0, so WDS mags probably okay =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 21056+1749 = J 797 recovered Date: Mon, 19 Oct 2009 12:57:45 -0700 Improved coordinates, fainter: WDS 21056+1749 = TYC 1653-1452-1 = 3UC 216-314632 21 05 37.3 +17 49 46 (J2000, UCAC3) --- combined V = 11.8 (ASAS-3, TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 21081+1857 = J3125 recovered Date: Mon, 19 Oct 2009 13:01:44 -0700 Nearly 3' off in the WDS, but there is some modern astrometry. WDS 21081+1857 = GSC 1657-0754 = 3UC 218-301490/87 21 08 17.1 +18 57 54 (J2000, UCAC3) --- combined V = 12.1 (TASS MkIV, ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GSC 2194-1240 is double Date: Mon, 19 Oct 2009 13:06:02 -0700 New pair found while hunting for WDS 21179+2630 = J3134, which was not found in a 9'x9' field. Kinda too faint to be really of interest, however. GSC 2194-1240 = 3UC 233-266217 = 2MASS J21180457+2629347 21 18 04.6 +26 29 35 (J2000, UCAC3) --- estimated separation 2".5 in pa280 --- V ~12.5 + 13; combined V = 11.9 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 21389+4249 = J1232 recovered Date: Mon, 19 Oct 2009 13:09:34 -0700 About 1'.5 off in the WDS, and fainter as usual. WDS 21389+4249 = GSC 3191-1244 = 3UC 266-231759/58 21 38 48.5 +42 50 26 (J2000, UCAC3) --- combined V = 11.9 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 21554+3441= Pop 88 ID error Date: Mon, 19 Oct 2009 13:13:19 -0700 Popovic misidentified this pair, which lies SW ~3'. Much fainter of course, and there is modern astrometry. WDS 21554+3441 = TYC 2727-1100-1 = 3UC 250-271828/24 21 55 18.0 +34 38 19 (J2000, 2MASS) --- combined V = 11.7 (TASS MkIV) added later: theta rho epoch source 241.5 3.94 2000.444 2MASS 240.7 3.78 2001.633 CMC14 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 22563+5657 = MLB 374 recovered Date: Mon, 19 Oct 2009 13:21:46 -0700 Readily found, and fainter than advertised. There is modern astrometry + AC available. WDS 22563+5657 = GSC 3993-1452 = 3UC 294-209293/98 22 56 05.28 +56 53 34.4 (UCAC3 for primary) --- combined V ~12.0 ...okay, the last of the bunch: WDS 22572+1403 = J 669: coords okay, but combined V = 11.6 (ASAS-3,TASS MkIV) add later: theta rho epoch source 37.6 1.49 2000.740 SDSS DR7 Depending on the seeing, I'm hoping to have some actual new data for a lot of these in the coming few nights. Will keep you posted. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 387 + 388 Date: Wed, 21 Oct 2009 16:51:33 -0700 This pair has common motion in UCAC3, and was noted by Giclas et al (1978LowOB...8...51G) as a "possible" physical pair. In the visible the SW component is slightly brighter, but it is clearly the fainter one in the 2MASS J image. Thus the NE component is a fair bit redder. GR* 387 = 3UC 118-524149 = 2MASS J23205779-3113339 23 20 57.80 -31 13 34.0 (J2000, UCAC3) GR* 388 = 3UC 118-524150 = 2MASS J23205866-3113190 23 20 58.65 -31 13 19.0 (J2000, UCAC3) --- separation 18".6 in pa 36 --- V = 15.7 + 15.9 (GSC-2.3 g+r/2) combined V = 15.0 +/- 0.9(!) (ASAS-3), very noisy but consistent =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 396 is a pair Date: Wed, 21 Oct 2009 18:23:36 -0700 This pair was probably too close/too faint to be resolved on the Pluto Camera plates, so has been overlooked. Slight motion is evident between the DSS1-red and later plates, but I'd still put this one in the "possible" common-motion category. The Yale SPM shows it with motion of -75.8, -6.1 mas/year, which is consistent with the images; similar figures from NOMAD, both evidently for the brighter NW component. If these are right, then the physical connection is certain. GR* 396 A = 2MASS J23235646-2557131 23 23 56.47 -25 57 13.1 (J2000, 2MASS) GR* 396 B = 2MASS J23235683-2557147 23 23 56.83 -25 57 14.8 (J2000, 2MASS) --- separation 5".2 in pa 109 --- V = 16.5 + 17.1 for assumed combined approximate V=16.0 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 408 + 407 Date: Wed, 21 Oct 2009 19:46:27 -0700 This pair was noted as having common motion by Giclas et al (1978LowOB...8...51G), confirmed by more modern astrometry. GR* 408 A = 3UC 132-456967 = 2MASS J23264356-2426171 23 26 43.57 -24 26 17.2 (J2000, UCAC3) GR* 407 B = 3UC 132-456966 = 2MASS J23264314-2426238 23 26 43.15 -24 26 23.9 (J2000, UCAC3) --- separation 8".9 in pa 221 --- V = 14.4 + 15.0 (assumes UCAC3 delta-m); combined V = 13.89 +/- 0.15 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 419 is double Date: Wed, 21 Oct 2009 20:14:58 -0700 This is a ~2" unequal pair that is merged on DSS/2MASS images. GR* 419 = 3UC 121-616061 = 2MASS J23294237-2954428 23 29 42.38 -29 54 42.8 (J2000, UCAC3 for primary) --- separation ~2" in pa ~210 --- combined V = 14.1 +/- 0.2, delta-m ~1.5 - 2 ? =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GSC 7517-0733, random field pair Date: Wed, 21 Oct 2009 20:32:27 -0700 Lies near GR* 422, but not related, and other than proximity at high latitude, nothing to say they're related. Similar G-dwarfish color, but that's pretty common. They're resolved in UCAC3, but one of the stars (but which?) has 'radial' proper motion. I'm showing 2MASS astrometry below. GSC 7517-0733 A = 3UC 114-489446 = 2MASS J23303276-3317505 23 30 32.76 -33 17 50.6 (J2000, 2MASS) GSC 7517-0733 B = 3UC 114-489443 = 2MASS J23303249-3317477 23 30 32.50 -33 17 47.7 (J2000, 2MASS) --- separation 4".4 in pa 222 --- V = 15.2 + 15.3, taking UCAC3 delta-m; combined V = 14.5 +/- 0.3 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CD-31 19317 is double Date: Wed, 21 Oct 2009 20:54:06 -0700 Another random high-latitude pair. These are resolved and flagged as double in UCAC3, but the motion of the eastern component is 'radial'. Colors relatively blue (F-ish). Adopting 2MASS astrometry for now. CD-31 19317 A = TYC 7514-0304-1 = 3UC 119-532035 = 2MASS J23304496-3053190 23 30 44.97 -30 53 19.0 (J2000, 2MASS) CD-31 19317 B = 3UC 119-532036 = 2MASS J23304539-3053191 23 30 45.40 -30 53 19.2 (J2000, 2MASS) --- separation 5".5 in pa 92 (2MASS, notice DSS1 [1954.75] images show pa 90 or slightly less) --- V= 12.3 + 12.8 adopting UCAC3 delta-m (and the actual mags too); combined V = 11.74 +/- 0.04 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 426 is double Date: Wed, 21 Oct 2009 21:07:24 -0700 Another unequal ~2" pair similar to GR* 419, oval to partly resolved on DSS/2MASS images. GR* 419 = 3UC 125-589326 = 2MASS J23310606-2730010 23 31 06.08 -27 30 01.3 (J2000, UCAC3) --- separation ~2" in pa ~315 --- combined V = 14.8 (ASAS-3 and GSC-2.3 b+r/2); delta-m ~1.5 - 2 ? =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 432 is double Date: Wed, 21 Oct 2009 21:18:33 -0700 A close, equal pair this time. GR* 432 = 3UC 128-498605 = 2MASS J23325633-2607569 23 32 56.34 -26 07 56.9 (J2000, UCAC2, probably photocenter) --- separation ~2" in pa 30/210 --- V= 16.0 + 16.0; combined V = 15.2 (GSC-2.3 b+r/2) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 451 is double Date: Wed, 21 Oct 2009 21:57:00 -0700 This one is right at the limit of the DSS/2MASS images, but luckily it appears to be dead-equal. GR* 451 = 3UC 120-569843 = 2MASS J23382753-3019590 23 38 27.54 -30 19 59.2 (J2000, UCAC3) --- separation ~1" in pa 0/180 --- V = 15.5 + 15.5, combined V = 14.8 (GSC-2.3 g+r/2) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on WDS 23402-2252 = LDS 6049 Date: Wed, 21 Oct 2009 22:19:22 -0700 Simple comparison of DSS1/2 and 2MASS images shows this is an optical pair: the faint companion NW shows little motion compared to the primary. The motion star is also GR* 458. Nearby GR* 457, a few arcminutes SW, has dissimilar motion and is also not related. =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Note on GR* 459/460 Date: Wed, 21 Oct 2009 22:25:39 -0700 These are suspected to be a physical pair by Giclas et al, but are not: the NE component is moving fairly quickly away from the southwestern star. To have a look, a rough position is: 23 40 16 -31 42.1 (J2000). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 468 is double Date: Wed, 21 Oct 2009 22:53:36 -0700 Another nice wide one with moderate delta-mag. Resolved in various modern catalogues. GR* 468 A = 3UC 130-484127 = 2MASS J23430377-2507200 23 43 03.78 -25 07 20.1 (J2000, UCAC3) GR* 468 B = 3UC 130-484126 = 2MASS J23430376-2507260 23 43 03.76 -25 07 26.0 (J2000, UCAC3) --- separation 6".0 in pa 183 --- V = 15.2 + 16.4 taking UCAC3 delta-m (1.15); combined V = 14.8 (ASAS-3, large uncertainty but consistent with other stuff) --- CMC14 shows delta-r' = 0.86 +/- 0.05 from n=3 photometric obs, looks a little too small from Schmidt plates, but DENIS delta-I and 2MASS delta-J also smaller --- Yale SPM shows common motion and photographic delta-V = 1.05 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 475 is double Date: Wed, 21 Oct 2009 23:51:57 -0700 Another close pair just recognizable on DSS/2MASS images. GR* 475 = 3UC 129-513022 = 2MASS J23453362-2531089 23 45 33.63 -25 31 08.9 (J2000, UCAC3) --- separation ~1" in pa ~100 ? --- V = 15.3 + 15.3, assumed equal; combined V = 14.6 +/- 0.3 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 485 is double Date: Thu, 22 Oct 2009 00:17:10 -0700 A fairly faint one visible on DSS images and resolved in 2MASS; the UCAC3 motion is probably okay. GR* 485 A = 2MASS J23500651-2910458 23 50 06.52 -29 10 45.8 (J2000, 2MASS) GR* 485 B = 2MASS J23500651-2910458 23 50 06.30 -29 10 44.3 (J2000, 2MASS) --- separation 3".3 in pa 297 --- V = 15.7 + 16.7, assuming delta-V = 1.0; combined V = 15.3 (GSC-2.3 b+r/2) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 491 + 492 Date: Thu, 22 Oct 2009 00:38:04 -0700 This pair was noted by Giclas et al as a likely physical pair, but their estimates of the motion were uncertain. GR* 491 = 3UC 125-590339 = 2MASS J23520799-2744583 23 52 08.02 -27 44 58.4 (J2000, UCAC3) GR* 492 = 3UC 125-590340 = 2MASS J23520824-2744525 23 52 08.26 -27 44 52.6 (J2000, UCAC3) --- separation 6".7 in pa 29 --- V = 14.2 + 16.0 (GSC-2.3 b+r/2); consistent with combined V = 14.0 +/- 0.2 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GR* 499 is double [Skf 168, last of GR pairs] Date: Thu, 22 Oct 2009 01:01:03 -0700 ...but evidence leans toward it being optical, despite very similar colors. GR* 499 A = 3UC 132-458295 = 2MASS J23531296-2402562 23 53 12.97 -24 02 56.3 (J2000, UCAC3) GR* 499 B = 3UC 132-458296 = 2MASS J23531350-2402579 23 53 13.50 -24 02 58.1 (J2000, UCAC3) --- separation 7".6 in pa 104 --- V = 15.0 + 16.2, again taking UCAC3 values as V is consistent with combined V = 14.7 +/- 0.3 from ASAS-3 --- notice rough consistency of Yale SPM, USNO-B1.0, UCAC3 motions, which imply an optical pair. position angle is also significantly larger on POSS-I plates, consistent with the fainter component having motion toward NE =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BPS BS 16080-053 is double Date: Wed, 28 Oct 2009 15:30:51 -0700 I happen now to be looking at a big list of UBVRI photometry by Beers et al (2007ApJS..168..128B). The positions in the on-line file turn out to be rough, so I'm going through to fix it. I've noticed a few possible common-motion pairs, but skipped them until this "likely" case. This one is semi-resolved in UCAC3, but not sure I trust the motion there; coords better in 2MASS. The magnitude/color/location suggest a mid-K dwarf pair. BPS BS 16080-053 A = 3UC 302-111531 = 2MASS J16393312+6053435 16 39 33.12 +60 53 43.6 (J2000, 2MASS) BPS BS 16080-053 B = 3UC 302-111532 = 2MASS J16393350+6053447 16 39 33.50 +60 53 44.7 (J2000, 2MASS) --- separation 3".0 in pa 68 (2MASS astrom) --- V = 11.8 + 13.7 assuming UCAC3 delta-mag and combined V = 11.586, B-V = 1.267, U-B = 1.287 (Beers et al) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BPS BS 16929-035 is wide pair Date: Wed, 28 Oct 2009 16:50:47 -0700 This star is the brighter of a wide common-motion pair. The Beers UBV data indicate a very metal-poor system, at least for the primary. BPS BS 16929-035 = 3UC 256-105880 = 2MASS J13125741+3749536 = SDSS J131257.38+374953.5 13 12 57.41 +37 49 53.7 (J2000, UCAC3) 3UC 256-105881 = 2MASS J13125903+3750139 = SDSS J131259.00+375013.9 13 12 59.02 +37 50 14.1 (J2000, UCAC3) --- separation 28".0 in pa 47 (UCAC3) 28".2 in pa 45 (USNO-A2.0, epoch 1950.4) --- V = 12.98 + 15.1 (Beers photom for primary, SDSS g+r/2 for secondary) --- V = 12.977, B-V = 0.391, U-B = -0.208 (2007ApJS..168..128B) for the primary --- proper motions: pmA,D = -58,-24 -70,-20 (USNO-B1.0) -73,-29 (PPMX) -61,-29 -70,-30 (UCAC3) -62,-30 -74,-22 (SDSS DR7) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BPS BS 17436-016 is double Date: Wed, 28 Oct 2009 18:32:22 -0700 Another faint one, and though there's no obvious motion, the colors look very good for an early-K + M-dwarf pair. BPS BS 17436-016 A = 3UC 274-120704 = 2MASS J13233167+4637042 = SDSS J132331.67+463704.2 13 23 31.67 +46 37 04.2 (J2000, 2MASS) BPS BS 17436-016 B = 3UC 274-120705 = 2MASS J13233198+4636593 = SDSS J132331.98+463659.2 13 23 31.98 +46 36 59.3 (J2000, 2MASS) --- separation 5".9 in pa 147 --- V = 13.9 + 16.4 adopting SDSS DR7 delta-g and combined V = 13.8 from Beers; the SDSS g+r/2 for the secondary is also 16.4 (the primary is saturated) --- combined light V = 13.835, B-V = 0.891, V-R = 0.515, V-I = 0.997 (2007ApJS..168..128B) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HE 2325-0755 is double Date: Thu, 29 Oct 2009 20:35:53 -0700 This is a metal-poor common-motion binary whose catalogue name comes from the Hamburg-ESO survey. The motion is evident by comparing POSS-I scans with newer images (2MASS etc). It is resolved in some modern catalogues. The UCAC3 motion for the primary seems to be correct, but the secondary has 'radial' motion. HE 2325-0755 A = 3UC 165-308705 = 2MASS J23275962-0739134 23 27 59.62 -07 39 13.4 (J2000, 2MASS) HE 2325-0755 B = 3UC 165-308704 = 2MASS J23275953-0739089 23 27 59.54 -07 39 08.9 (J2000, 2MASS) --- separation 4".7 in pa 345 --- V = 14.3 + 15.3, assuming UCAC3 delta-mag, and combined V = 13.94 (2007ApJS..168..128B); also ASAS-3 shows V = 13.99 +/- 0.20 from n=156 observations, so the mean is pretty good despite the large rms scatter --- V = 13.940, B-V = 0.541, V-R = 0.331, V-I = 0.689 from Beers et al (2007ApJS..168..128B) --- spectroscopy by the same cabal (2005A&A...439..129B) shows: rv = -237 km/sec, Teff = 5665K, log g = 3.17, [Fe/H] = -2.85, which I interpret to be a metal-poor G giant =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Doubles near IC 2944 Date: Fri, 30 Oct 2009 20:43:05 -0700 Here are a few faint pairs among the stars observed photoelectrically and spectroscopically by Ardeberg & Maurice (1977A&AS...28..153A). The first one is "new", but the other two were noted by Ardeberg & Maurice as visual doubles. HD 308688 = CPD-62 2139 = ArMa 12 = 3UC 054-126361/57 = NSV 18810 11 36 39.61 -63 11 54.8 (J2000, UCAC3 for primary) --- resolved in UCAC3 and elsewhere; UCAC3 motion for the secondary is 'radial' --- separation 3".3 in pa 305 --- V = 11.6 + 12.6 assuming UCAC3 delta-mag, and A&M V = 11.24 --- spectral type: A0 (HDE) A3 (1980A&AS...39..325A) --- UBV and uvby-beta photometry available [these next two not in WDS] ArMa 81 = 3UC 054-127687/91/95 = 2MASS J11383901-6321582 11 38 38.8 -63 21 58 (J2000, UCAC2) --- noted by Ardeberg & Maurice as visual double --- separation ~2" in pa ~90 --- V = 14.4 + 14.4, assumed equal, with combined V = 13.69 --- V = 13.69, B-V = 0.42, U-B = 0.36 (1977A&AS...28..153A) V = 13.87, b-y = 0.10 (2005ApJS..161..118M) ...inconsistent, perhaps pair partly resolved in CCD data ArMa 84 = 3UC 054-127727 = 2MASS J11384173-6322549 11 38 41.7 -63 22 55 (J2000, UCAC2) --- noted by Ardeberg & Maurice as visual double --- separation ~2" in pa ~100 --- V = 13.3 + 13.3, assumed equal, with combined V = 12.52 --- V = 12.52, B-V = 0.63, U-B = 0.28 (1977A&AS...28..153A) V = 12.51, b-y = 0.47 (2005ApJS..161..118M) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Pairs in NGC 2335 Date: Fri, 30 Oct 2009 21:46:30 -0700 These pairs were noted by Juan Claria in his UBV photoelectric study of this open cluster (1973A&AS....9..251C). NGC 2335 14 = TYC 5385-1822-1 = 3UC 160-046404 = 2MASS J07062401-1004416 7 06 24.0 -10 04 43 (J2000, Tycho-2) --- separation ~2" in pa ~0 --- V = 12.1 + 12.1, assuming delta-V = 0 and Claria combined V = 11.33 --- V = 11.33, B-V 0.29, U-B = -0.19 [these next two not in WDS] NGC 2335 24 A = 3UC 160-046722 = 2MASS J07064902-1006408 7 06 49.03 -10 06 40.8 (J2000, 2MASS) NGC 2335 24 B = 3UC 160-046721 = 2MASS J07064901-1006351 7 06 49.01 -10 06 35.1 (J2000, 2MASS) --- N.B. AC astrometry and modern data from several sources --- separation 5".7 in pa 357 --- V = 12.7 + 12.7 assuming delta-V = 0 and Claria combined V = 11.90 --- V = 11.90, B-V = 0.51, U-B = 0.14 NGC 2335 48 A = 3UC 160-046834 = 2MASS J07065759-1004231 7 06 57.59 -10 04 23.2 (J2000, 2MASS) NGC 2335 48 B = 3UC 160-046828 = 2MASS J07065738-1004254 7 06 57.39 -10 04 25.4 (J2000, 2MASS) --- separation 3".8 in pa 233 --- V = 13.5 + 14.0 assuming UCAC3 delta-mag and Claria combined V = 13.01 --- V = 13.01, B-V = 0.45, U-B = 0.29 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CPD-57 6908 is double Date: Sat, 31 Oct 2009 12:10:46 -0700 Another one in the "maybe" department --- certainly double, but only maybe a physical pair. I noticed it while working on a set of UBV sequences by Loden & Nordstrom (1969ArA.....5..231L). They must have noticed the pair, though there's no remark about it, since they show only the V magnitude but no colors. The V mag is confirmed at least roughly by ASAS-3, and the 2MASS colors are similar. The UCAC2 and UCAC3 motions are equivocal. CPD-57 6908 A = 3UC 065-309957 = 2MASS J15060838-5742318 15 06 08.38 -57 42 31.8 (J2000, UCAC2) CPD-57 6908 B = 3UC 065-309950 = 2MASS J15060776-5742349 15 06 07.75 -57 42 34.9 (J2000, UCAC2) --- separation 5".9 in pa 239 --- V = 11.7 + 12.2 assuming delta-V = 0.5 and Loden V = 11.13 --- also V = 11.20 +/- 0.04 (ASAS-3) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: BD+73 415 is cpm pair Date: Fri, 06 Nov 2009 13:28:13 -0700 Working on more photometric sequences, I notice that this star is a wide common-motion pair. Astrometric data go back to the AC, and it is flagged as a pair in UCAC3. BD+73 415 A = TYC 4380-10087-1 = 3UC 327-035496 8 28 17.52 +73 08 11.4 (J2000, UCAC3) BD+73 415 B = 3UC 327-035492 8 28 15.81 +73 08 16.5 (J2000, UCAC3) --- separation 9".0 in pa 304 --- V = 10.3 + 12.9, assuming UCAC3 delta-mag and combined V = 10.16 from 1956JO.....36....1L --- V = 10.16, B-V = 0.52 (1956JO.....36....1L) V = 10.10 +/- 0.06, V-I = 0.75 +/- 0.07 (TASS MkIV) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: GSPC P319-F is double Date: Sun, 08 Nov 2009 14:22:18 -0700 This is evidently an M dwarf binary with modest proper motion near the north galactic pole. It is oval-to-partly-resolved on DSS and 2MASS images, but much more cleanly resolved on SDSS images, despite the poor tracking/jumpy seeing there. Seems to be roughly fixed in orientation since the time of the POSS-I plates. GSPC P319-F A = GSC 1987-0426 = 3UC 238-105859 = SDSS J114602.33+284325.8 11 46 02.37 +28 43 25.9 (J2000, SDSS DR7) GSPC P319-F B = SDSS J114602.27+284323.9 11 46 02.28 +28 43 23.9 (J2000, SDSS DR7) --- separation 2".1 in pa 211 per SDSS astrometry, which may not be very good --- V = 13.8 + 15.8, assuming approximate delta-V = 2, and combined V= 13.68, B-V = 1.56 (1988ApJS...68....1L); also V = 13.71 +/- 0.08, V-I = 2.4 +/- 0.2 (TASS MkIV), and: V = 13.765, V-R = 1.055 (GSPC-II, 2001A&A...368..335B) --- also seems to be a ROSAT x-ray source, unsurprisingly for an M dwarf =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: UBV for WDS 22453+4002 = AG 287 Date: Thu, 12 Nov 2009 23:30:24 -0700 Not sure if you care about this sort of thing, but there is resolved UBV data for this cpm pair in 1976ApJS...30...97D: V B-V U-B AG 287 A: 9.07 0.96 0.58 AG 287 B: 10.78 0.65 0.02 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: WDS 05079+4545 = HDS 671 rho error ? Date: Thu, 12 Nov 2009 23:48:56 -0700 This pair seems a lot wider than advertised, and appears relatively fixed on the POSS-I plates (i.e. no motion since 1991 implied either). UCAC3: 7".6 in pa 214 2MASS: 7".6 in pa 213 ...versus 4".0 in pa 227 in WDS. From: Brian Skiff To: Brian D. Mason Subject: Re: WDS 05079+4545 = HDS 671 rho error ? Date: Fri, 13 Nov 2009 11:23:03 -0700 The ID is confirmed. There is a note in the Hipparcos catalogue that sez: Ambiguous double-star solution. An alternative solution for AB gives: magnitude diff. = 3.03, pos.angle = 135 deg, separation = 1.75 arcsec ....so maybe not the most reliable result! =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Third comp of WDS 23407+6257 = Sti 1195 Date: Fri, 13 Nov 2009 01:11:10 -0700 This one seems familiar, but maybe it's just a similar case for another Stein pair. His object is the optical one involving BD+62 2270, or AG+62 1465/6. The western component has been sliding by over the last century. I notice, however, that the nearby star BD+62 2271 = AG+62 1467 shares apparently common motion with the eastern component of BD+62 2270. Colors are nearly identical (in fact all three stars are nearly identical). Sti 1195 C = BD+62 2271 = 3UC 306-163242 = 2MASS J23404950+6257249 23 40 49.52 +62 57 25.0 (J2000, UCAC3) --- BC separation 32".6 in pa 43 (UCAC3) 32".4 in pa 43 (AC2000, epoch 1905.26) --- UCAC3 astrometry mix here is good --- Deutschman et al (1976ApJS...30...97D) give V = 10.06, B-V = 0.52, U-B = -0.05 for component C; they also show combined V = 9.19, B-V = 0.50, U-B = -0.06 for the AB pair; since they are essentially identical on DSS and 2MASS images, I assume they are the same brightness and color, and thus V = 10.0 + 10.0, confirming the Tycho-2 photometry =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 303917 is double Date: Fri, 13 Nov 2009 20:13:04 -0700 This one could possibly be a luminous binary including hot and cool components. It's a little too close to get good (or any!) astrometric information from the usual catalogues beyond it merely being double. It was noted as double as far back as the Stockholm spectral survey (1976A&AS...23..283L), though they may be referring to the component ~10" SE. The star was reported as having H-alpha emission object by MacConnell (1981A&AS...44..387M, his star [M81] I-341). HD 303917 = CD-58 3888 = CPD-58 3241 = TYC 8628-1274-1 = 2MASS J11104484-5902537 (not in UCAC2/3) 11 10 44.88 -59 02 53.9 (J2000, Tycho-2) --- separation ~2" in pa ~115 (quadrant ambiguous however) --- V = 10.2 + 10.2 assuming equal components --- combined V = 9.54, B-V = 0.61, U-B = -0.10 (1977A&AS...29...31L) plus other photometry available --- spectral type: B5 (HDE) B2/5: (1976A&AS...23..283L) B5 (1977A&AS...29...31L) --- 2MASS colors also fairly red, either from the emission or from a cool component being involved (zeta Aur type?) --- there are two fainter stars ~10" SE and S that are mentioned in some sources (one is in the AC), but I'm ignoring those =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: CPD-57 5111 is a pair Date: Fri, 13 Nov 2009 22:03:43 -0700 If the motions available from Tyc2/UCAC2/UCAC3 are to be believed, then this is a common-motion pair. The available UBV photometry is not contradictory. CPD-57 5111 A = TYC 8643-0855-1 = UCAC2 06335302 = 3UC 064-179112/11 11 56 09.86 -58 25 47.5 (J2000, UCAC2) CPD-57 5111 B = UCAC2 06335291 = 3UC 064-179095 11 56 08.73 -58 25 53.0 (J2000, UCAC2) --- separation 10".5 in pa 238 (UCAC2 astrometry) --- V = 10.84 + 11.18 (1977A&AS...29...31L) other Loden data for A comp: B-V = 0.38, U-B = 0.28, spec A0/1 B comp: B-V = 0.43, U-B = 0.23, spec A1 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Bahcall et al "wide" binaries Date: Sun, 15 Nov 2009 16:41:52 -0700 I notice this odd list doesn't appear explicitly in the WDS. Perhaps the supposed follow-up data were awaited---which never came, at least as indexed in SIMBAD. Here is the list, with only the WDS name if it already appears there, but with some catalogue details if not. There are a few new very likely physical pairs here, all rather wide. \Brian source: 1986ApJS...60..939B BAHCALL J.N., JONES B.F. and RATNATUNGA K.U. Astrophys. J., Suppl. Ser., 60, 939-943 (1986) Wide binaries in the direction of Andromeda. [WDS acronym is 'BJN'] [BJR86] 1 = BD+45 405 = WDS 01397+4602 = EGB 1 [BJR86] 2 = BD+41 334 = WDS 01431+4238 = Roe 65 [BJR86] 3a = 3UC 268-017731 = 2MASS J01424888+4348042 [BJR86] 3b = 3UC 268-017733 = 2MASS J01424924+4348109 --- resolved in AC2000 --- PPMX and UCAC3 suggest cpm --- combined V = 11.8 (TASS MkIV) [BJR86] 4 = BD+45 448 = WDS 01483+4600 = Es 1305 [BJR86] 5 = WDS 01485+4627 = Brt 326 [BJR86] 6a = 3UC 265-016950 = 2MASS J01500493+4226030 [BJR86] 6b = 3UC 265-016949 = 2MASS J01500453+4226105 --- one star in AC2000 [BJR86] 7a = 3UC 269-020797 = 2MASS J01533369+4403560 [BJR86] 7b = 3UC 269-020798 = 2MASS J01533399+4403482 --- one star in AC2000 --- UCAC3 motion wrong for primary --- combined V = 11.7 (TASS MkIV) [BJR86] 8a = 3UC 274-025194 = 2MASS J01551957+4647042 [BJR86] 8b = 3UC 274-025195 = 2MASS J01551971+4646571 --- resolved in AC2000 --- looks like good cpm pair --- combined V = 10.8 (TASS MkIV) [BJR86] 9 = BD+42 351 = WDS 01420+4252 = Roe 64 [BJR86] 10a = TYC 2827-0401-1 = 3UC 268-018868 = 2MASS J01493438+4334294 [BJR86] 10b = TYC 2827-2116-1 = 3UC 268-018866 = 2MASS J01493386+4334413 --- AC2000, Tycho-2, etc --- optical pair --- galaxy superposed ~15" SE [BJR86] 11a = TYC 3282-1760-1 = 3UC 274-021652 = 2MASS J01392387+4657420 [BJR86] 11b = TYC 3282-1688-1 = 3UC 274-021647 = 2MASS J01392321+4657302 --- AC2000, Tycho-2, etc --- prob optical [BJR86] 12a = TYC 2827-0077-1 = 3UC 269-019496 = 2MASS J01464532+4421438 [BJR86] 12b = TYC 2827-1894-1 = 3UC 269-019502 = 2MASS J01464659+4421467 --- AC2000, Tycho-2, etc --- probably cpm [BJR86] 13a = BD+41 333 = TYC 2823-2042-1 = 3UC 265-015765 [BJR86] 13b = TYC 2823-2113 -1 = 3UC 265-015763 --- AC2000, Tycho-2, etc --- prob optical [BJR86] 14a = HD 16111 = TYC 3280-1041-1 = 3UC 273-024109 [BJR86] 14b = 3UC 273-024108 = 2MASS J01550239+4611059 --- AC2000, Tycho-2, etc --- probably cpm [BJR86] 15 = WDS 01496+4618 = Bu 1365 [BJR86] 16 = WDS 01517+4549 = Arg 51 [BJR86] 17a = TYC 2823-2449-1 = 3UC 265-015973 [BJR86] 17b = TYC 2823-1978-1 = 3UC 265-015974 --- AC2000, Tycho-2, etc --- motion ambiguous [BJR86] 18a = BD+43 347 = TYC 2827-0741-1 = 3UC 270-019133 [BJR86] 18b = AG+44 184 = 3UC 270-019139 --- resolved in AC2000 --- prob optical [BJR86] 19a = TYC 2827-0684-1 = 3UC 269-019280 [BJR86] 19b = TYC 2827-0681-1 = 3UC 269-019277 --- AC2000, Tycho-2, etc --- motion ambiguous, but prob optical [BJR86] 20 = WDS 01459+4535 = Es 1361 AB [BJR86] 21a = TYC 3279-0617-1 = 3UC 272-022155 [BJR86] 21b = TYC 3279-0586-1 = 3UC 272-022160 --- AC2000, Tycho-2, etc --- optical pair [BJR86] 22a = TYC 2828-0532-1 = 3UC 269-021117 [BJR86] 22b = TYC 2828-0523-1 = 3UC 269-021115 --- AC2000, Tycho-2, etc --- motion ambiguous [BJR86] 23a = BD+45 474 = TYC 3280-0788-1 = 3UC 273-023997 [BJR86] 23b = TYC 3280-0956-1 = 3UC 273-024005 --- AC2000, Tycho-2, etc --- motion ambiguous [BJR86] 24a = BD+47 472 = TYC 3282-1755-1 = 3UC 276-022487 [BJR86] 24b = TYC 3282-0965-1 = 3UC 276-022482 --- AC2000, Tycho-2, etc --- common proper motion [BJR86] 25a = TYC 3283-0190-1 = 3UC 275-022256 [BJR86] 25b = TYC 3283-1276-1 = 3UC 275-022242 --- AC2000, Tycho-2, etc --- common proper motion [BJR86] 26a = BD+42 354 = TYC 2823-1135-1 = 3UC 267-016425 = IRAS 01392+4246 [BJR86] 26b = AG+42 166 = TYC 2823-0285-1 = 3UC 267-016429 --- AC2000, Tycho-2, etc --- optical pair [BJR86] 27a = TYC 2827-0965-1 = 3UC 269-018251 [BJR86] 27b = 3UC 269-018250 --- resolved in AC2000 --- motion ambiguous [BJR86] 28a = BD+43 356 = TYC 2827-0391-1 = 3UC 269-019166 [BJR86] 28b = AG+43 208 = TYC 2827-2248-1 = 3UC 269-019167 --- AC2000, Tycho-2, etc --- optical pair [BJR86] 29a = TYC 2827-1984-1 = 3UC 267-017017 [BJR86] 29b = 3UC 267-017022 --- resolved in AC2000 --- optical pair [BJR86] 30a = BD+42 348 = TYC 2823-1111-1 = 3UC 267-016281 [BJR86] 30b = TYC 2823-1557-1 = 3UC 267-016283 --- resolved in AC2000 --- optical pair [BJR86] 31a = TYC 2823-2197-1 = 3UC 265-015449 [BJR86] 31b = UCAC2 46363129 --- resolved in AC2000 --- optical pair [BJR86] 32a = BD+41 320 = TYC 2822-0208-1 = 3UC 265-015234 [BJR86] 32b = 3UC 265-015237 --- resolved in AC2000 --- motion ambiguous [BJR86] 33a = BD+41 348 = TYC 2823-2192-1 = 3UC 266-017232 [BJR86] 33b = TYC 2823-2402-1 = 3UC 266-017224 --- resolved in AC2000 --- optical pair [BJR86] 34 = WDS 01514+4329 = hj 2089 [BJR86] 35a = BD+46 460 = TYC 3283-0728-1 = 3UC 276-025332 [BJR86] 35b = TYC 3283-0756-1 = 3UC 276-025339 --- motion ambiguous [BJR86] 36a = BD+45 408 = TYC 3278-1786-1 = 3UC 273-020892 [BJR86] 36b = TYC 3278-1802-1 = 3UC 273-020895 --- third comp = 3UC 273-020897 about 23" SE --- main pair resolved in AC2000 --- trio prob optical [BJR86] B1 = WDS 01550+4519 = Es 453 [BJR86] B2 = WDS 01424+4506 = Sma 20 [BJR86] B3a = BD+43 368 = TYC 2827-0404-1 = 3UC 270-020431 [BJR86] B3b = 3UC 270-020430 = 2MASS J01475228+4440017 [BJR86] B4a = TYC 3283-1523-1 = 3UC 277-022947 [BJR86] B4b = 3UC 277-022942 --- resolved in CMC14, 3UC, 2MASS --- nearly equal, combined V = 10.7 (TASS MkIV) [BJR86] B5 = WDS 01449+4619 = Es 1301 [BJR86] B6 = WDS 01570+4653 = Es 1214 [BJR86] B7 = WDS 01493+4754 = Struve 162 AC =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: HD 322416 = LDS 576 Date: Tue, 17 Nov 2009 21:44:59 -0700 This is also L 412-4 and -3, and the WDS position is off by ~3'.5, so I didn't pick it up in my usual 60 arcsec search radius in VizieR. The primary is in Tycho-2, and both appear in AC2000. UCAC3 cribs its proper motion from the Salim & Gould revised NLTT catalogue (2003ApJ...582.1011S); only UCAC astrograph data contribute to the astrometry in UCAC3. HD 322416 A = TYC 7872-0788-1 = 3UC 100-230785 16 58 43.31 -40 13 18.7 (J2000, UCAC3) HD 322416 B = 3UC 100-230802 16 58 45.21 -40 13 03.9 (J2000, UCAC3) --- separation 26".3 in pa 56 (UCAC3) 26".3 in pa 55 (AC2000, ep 1903.6) --- V = 10.8 + 11.8 using published UBV for the primary and GSC short-V for the secondary --- primary V = 10.76, B-V = 0.94, U-B = 0.64 (1985A&A...151..309H) =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: LDS 140 and MLO 15 Date: Fri, 27 Nov 2009 21:24:22 -0700 Perhaps this is mentioned somewhere in your files, but I would willing to bet these are the same object, with a typo in the separation for the MLO pair (should be 18" not 8"), and _both_ position-angles approximate. UCAC3 gives: 17".75 in pa 290. The Luyten pair does indeed have moderately-large common proper motion; WDS coords are pretty close for the primary. UCAC3 has a fair complement of astrometry here, so the motions seem to be very consistent. ASAS-3 shows combined V = 11.12 +/- 0.05, in good agreement with the sum of the WDS magnitudes, so those are okay. From: Brian Skiff To: Brian D. Mason Subject: Re: LDS 140 and MLO 15 Date: Wed, 09 Dec 2009 13:29:28 -0700 I'll admit my guess is speculative, based largely on the semi-near position coincidence. I tend to regard this sort of double star like most asteroids: if you lose them it's not really a problem, since they'll show up again from another trace in the literature (or on the sky). =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: An earlier mention of the WGN 1 pair Date: Sat, 28 Nov 2009 17:55:10 -0700 A note by Alexander & Lourens (1969MNSSA..28...95A) provides a new determination of the proper motion of CD-38 10980, which is the white dwarf component of this wide pair, which we recently found to have been independently recognized by Wegner in a 1973 paper. The MNSSA paper shows from new measurements that this is the case. They also give new UBV data for the stars: Name V B-V U-B HR 6094 5.40 0.62 0.13 CD-38 10980 11.02 -0.15 -0.95 =============================================================================== From: Brian Skiff To: bdm@usno.navy.mil Subject: Sti 2051 UBV data Date: Thu, 10 Dec 2009 19:33:58 -0700 Happened to notice this in a mid-60s PASP by Bob Hardie and Arnie Heiser (1966PASP...78..171H): V B-V U-B Stein 2051 A 11.08 1.65 1.21 Stein 2051 B 12.44 0.31 -0.53 This was done using a single-channel photometer with the 60cm Seyfert telescope in Nashville. They cite internal mean errors of 0.02, 0.03, and 0.04 respectively on V, B-V, and U-B. The WDS values are somewhat different for V (assumed). Perhaps there is later stuff that is more accurate. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: 2MASS obs of WDS 23596-3502 = B2511 Date: Tue, 22 Dec 2009 18:40:26 -0700 This guy has only the original measurement in the WDS. The 2MASS astrometry shows: 4".03 in pa 170.2 (1999 Aug 11) ...which indicates this is a common-motion pair. The LDS companion about 2'.5 away has dissimilar motion and must not be related. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CPD-58 3375 components Date: Tue, 29 Dec 2009 13:29:14 -0700 This one is perhaps marginally worth mentioning, and basically confirms the UCAC3 pair and adds a third component that comes up in the near-IR. Likely to be an optical trio, however. CPD-58 3375 A = CD-58 3942 A = TYC 8628-1572-1 = UCAC2 05571179 = 3UC 061-150977 = 2MASS J11151538-5936009 = LS 2277 11 15 15.39 -59 36 01.1 (J2000, UCAC2/3) --- V = 10.9 (Tycho-2) --- given as OB type in the LS catalogue and by Graham & Lynga (1965MmMtS..18.....G), confirmed by Graham's follow-up Stromgren-beta measurement (beta = 2.628 ---> B1/2 if it is main-sequence with no emission). CPD-58 3375 B = CD-58 3942 B = UCAC2 05571177 = 3UC 061-150975 = 2MASS J11151526-5935538 11 15 15.27 -59 35 53.9 (J2000, UCAC3) --- separation 7".2 in pa 353 --- mv ~12. (estimate) C comp = 2MASS J11151566-5935518 11 15 15.67 -59 35 51.9 (J2000, 2MASS) --- BC separation 3".7 in pa 56 --- mv ~18? (rough estimate only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr, thenry@chara.gsu.edu, riedel@phy-astr.gsu.edu Subject: Three flare stars Date: Tue, 29 Dec 2009 22:40:49 -0700 While picking up some stray spectral types from the IBVS, I noticed these three flare stars reported by Sanduleak on 1968IBVS..275....1S. SIMBAD is more-or-less okay, though the coordinates can be improved for V775 Cen especially. I used Sanduleak's charts to identify the stars. The fairly faint magnitudes and modest proper motions suggest they are perhaps ~100pc distant and thus not nearby stars. The M-dwarf EE Mus appears to be oval on DSS and 2MASS images, suggesting it is a binary, though better images will be required to confirm this. EE Mus = 1RXS J123052.5-655020 (= UCAC2 02914880 = 2MASS J12305635-6550244) 12 30 56.36 -65 50 24.4 (J2000, UCAC2) --- the RSX source is 24" away, but I fail to see how it could be other than this M-dwarf flare star --- DSS/2MASS images suggest it is a ~1" pair in pa ~225 V755 Cen = 3UC 056-218633 = 2MASS J13053777-6212123 13 05 37.78 -62 12 12.3 (J2000, 2MASS) V756 Cen = 2MASS J13341746-6314256 = 3UC 054-215146 13 34 17.47 -63 14 25.7 (J2000, 2MASS) --- modest motion is smaller than indicated by UCAC3 --- western of 5" optical pair =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Two pairs from 2009A&A...507..705B Date: Tue, 12 Jan 2010 11:55:52 -0700 In a list of spectral types for visible counterparts of x-ray sources superposed near M31, Bonfini et al (2009A&A...507..705B) remark on two pairs. See their Table 1 and related text. There is some concern whether the stars are actually the x-ray sources, but even though their spectra extend to ~6700A, they make no mention of H-alpha emission, which would be diagnostic, and their panel of specimen spectra cut off at 6500A. (sigh) In any case, these are clearly in the foreground of M31. The authors made successful use of two Lowell products. See their section 4 and Figure 3, plus images from Phil Massey's Local Group survey. B-) [PFH2005] 663 (AB) = 3UC 265-007463 = 2MASS J00454053+4208066 0 45 40.54 +42 08 06.6 (J2000, 2MASS) --- they remark on this as an unresolved pair and that the spectrum looks like a single object --- 2MASS images suggest ~2" separation in pa ~290 --- combined V = 12.7 (TASS MkIV) --- spectral type K4 (2009A&A...507..705B) [PFH2005] 766 A = 2MASS J00463749+4129053 0 46 37.49 +41 29 05.3 (J2000, 2MASS) [PFH2005] 766 B = 2MASS J00463781+4129037 0 46 37.81 +41 29 03.7 (J2000, 2MASS) --- separation 3".9 in pa 114, resolved in 2MASS and CMC14 --- V mags 15.0 + 15.0 (estimates) --- spectral types G2 + K1 (2009A&A...507..705B) --- comparison of DSS1 and later images shows the pair to have common proper motion; the UCAC3 motion is incorrect due to crowding; they are approaching a fainter field star to the north (not sure whether you want to add that as the 'C' component since it is obviously optical) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 102290/89 as cpm pair Date: Wed, 13 Jan 2010 22:08:34 -0700 This wide pair of mid-F(?) stars appear to have common proper motion, matching either Tycho-2 + UCAC2 or UCAC3 alone. HD 102290 is the slightly brighter southern star. The original HD catalogue gives the types as G0 + G; Nancy Houk did not reclassify them due to the overlap. The 2MASS J-K colors suggest they are somewhat earlier types. Using the Tyc2-UCAC2 coords, I get a separation of 54".4 in pa 0.5. HD 102290 = TYC 8215-1484-1 (etc) --- V = 8.2 (Tycho-2, ASAS-3) HD 102289 = UCAC2 11984710 = 3UC 088-133706 --- V = 8.7 (ASAS-3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: ID/coords correction for Rst 5572 = WDS 11104-5224 Date: Wed, 13 Jan 2010 20:25:46 -0700 This pair is mis-attributed to HD 97161, which is single, and the correct star is apparently the one ~2' NNW. The CD number is one unit off. I note the specs are somewhat different than the original Rossiter figures, but very different from the 1995 observation The 10"/pa240 datum applies to another pair to the east, specified below. Rst 5572 A = WDS 11104-5224 A = CD-51 5397 = CPD-51 3918 = TYC 8212-2184-1 = 2MASS J11102070-5222008 11 10 20.70 -52 22 00.7 (J2000, Tycho-2) Rst 5572 B = WDS 11104-5224 B = 2MASS J11102106-5221580 11 10 21.06 -52 21 58.0 (J2000, 2MASS) --- separation 4".3 in pa 51 (Tyc2-2MASS) --- UCAC3 motion for secondary is "radial" --- combined V = 10.85 +/- 0.04 (ASAS-3) neighboring pair: CD-51 5405 A = TYC 8212-2372-1 = 3UC 076-122518 (not in CPD) = 2MASS J11103914-5223390 11 10 39.14 -52 23 39.0 (J2000, UCAC3) CD-51 5405 B = 3UC 076-122511 = 2MASS J11103813-5223442 11 10 38.12 -52 23 44.2 (J2000, UCAC3) --- separation 10".7 in pa 241 (UCAC3) --- combined V = 10.76 +/- 0.04 (ASAS-3) --- delta-mag 3.5 in UCAC3, also DENIS I band =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr Subject: HD 80038 + HD 296843 cpm pair Date: Thu, 14 Jan 2010 21:57:38 -0700 I'm going through another section of the second Houk catalogue. I notice that these two stars have common motion, and are apparently a pair of late-G/K0 dwarfs. The original HD catalogue seems to specify the somewhat brighter SW component as HD 80038, and notes the NE companion in the remarks. HDE chart 86 marks both stars but has the IDs switched. I think this is incorrect, and the NE component should be assigned the HDE number (both K0 in any case). Nesterov et al have followed the HDE chart, so is also reversed. The UCAC3 dataset includes Tycho-2 and AC, so the proper motions there should be reliable. UCAC2 and Tycho-2 are very similar. I get separation of 24".6 in pa 22 using the Tycho-2 coordinates. HD 80038 = CD-46 5043a = CPD-46 3529 = TYC 8170-0112-1 9 15 49.64 -46 53 23.8 (J2000, Tycho-2) --- V = 10.25 (Erik Olsen via Stromgren uvby compilation) --- Houk spectral type G6/K0 (Stromgren b-y = 0.453 is consistent with type G8V) HD 296843 = CD-46 5043b = CPD-46 3530 = TYC 8170-0584-1 9 15 50.56 -46 53 01.1 (J2000, Tycho-2) --- V = 10.7 (Tycho-2) --- HDE type K0 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 81379 + 81398 cpm Date: Fri, 15 Jan 2010 00:16:14 -0700 These guys are about 90" apart and have significant common proper motion. The primary has a good Hipparcos parallax, so there's a new star with a parallax as well. HD 81379 = 3UC 098-078558 9 23 54.59 -41 06 06.1 (J2000, UCAC3) HD 81398 = 3UC 098-078604 9 24 00.36 -41 05 07.6 (J2000, UCAC3) --- separation 87".6 in pa 228 --- V = 8.6 + 8.8 (Tycho-2, Olsen uvby photometry) --- types F6/7V + F8/G0V (Houk) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 86956 cpm companion Date: Sat, 16 Jan 2010 13:26:21 -0700 This star and a relatively bright companion to the north seem to have common motion and relative color consistent with their being physical pair. HD 86956 = TYC 8190-0690-1 10 00 38.47 -50 22 03.8 (J2000, Tycho-2) CPD-49 3007 = TYC 8190-1992-1 = 3UC 080-085887 10 00 38.25 -50 21 47.5 (J2000, UCAC3) --- separation 16".4 in pa 353 --- 9.0 + 10.8 (Tycho-2) --- spectral type F5V (Houk, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10338-5106 = HDS 1515 minor correction Date: Sat, 16 Jan 2010 20:22:17 -0700 The WDS currently shows the primary for this pair as type K1III:. This comes from the Houk catalogue (HD 91648), but it turns out this is an inadvertent reclassification of the neighboring star HD 91649 about 35" NE. The original HD has a note saying the south-preceding star is probably type F and the following star (HD 91649) is type K. In the HDE Cannon reclassified them as F8 and G5. More recently William Wooden called them F8V and K2: (1971PW&SO...1b...1W). And Houk K0/2III: essentially twice from the same plate. Nancy identified stars via overlays from a CalComp plotter, and since the lettering was rather large, she had two such plots for each plate showing the even- and odd-numbered stars. So in cases like this she occasionally classified the same star twice. So anyways the WDS type for the primary of HDS 1515 should be F8V, not K1III:. This is consistent with the HIP B-V and parallax. I wonder if it is worth noting the more distant third star, since it is the brightest of the trio even in the blue. Wooden's spectral survey is by far the deepest in this region, but he could not resolve the B comp of the HIP pair. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10373-4814 = See 119 notes Date: Sat, 16 Jan 2010 21:13:50 -0700 The notes here (as shown from the B/wds link in VizieR) seems to have a line missing. The third and fourth lines are: "According to Evans (1969), this is the" "Identification of the ascending node is based on this assumption." ...presumably there's an intervening missing line saying something to the effect that the 10-day SB is the brighter of the visual pair. I note also the nice "details" entry for this system in the Pourbaix spectroscopic binary orbits catalogue (B/sb9 in VizieR). I continue to find it incredible that TJJ See found pairs like this! =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10385-4213 = Rst 1518 primary overlooked Date: Sat, 16 Jan 2010 21:31:51 -0700 The WDS shows this close pair, but does not mention the brighter third star about 21" SE. It is HD 92269 = CPD-41 4732 (Houk type A8/F0V) and shares common motion with the close binary. Colors are also consistent with their being a physical trio. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 94417/16 = CPO 53 Date: Sun, 17 Jan 2010 12:01:37 -0700 A pretty bright and wide overlooked common-motion pair. I would have thought this would appear in the TDSC if not in the classical lists (even CPO etc). A nice pair of garden-variety G dwarfs. ...wait, VizieR shows this in the CCDM as CPO 53, sure enough. The WDS listing of all CPO stars omits number 53, so this got missed somehow. Here's the specs anyway, but not new. HD 94417 = CD-42 6565 = CPD-42 4933 = TYC 7736-1514-1 = 3UC 094-108180 10 53 20.28 -43 16 00.5 (J2000, Tycho-2/UCAC3) HD 94416 = CD-42 6564 = CPD-42 4932 = TYC 7736-1515-1 = 3UC 094-108178 10 53 20.16 -43 15 45.5 (J2000, Tycho-2/UCAC3) --- separation 15".09 in pa 354.9 (2000.00, UCAC3) 15".11 in pa 354.2 (1902.85, AC2000) --- V = 9.2 + 9.7 (Tycho-2) combined V= 8.78 +/- 0.04 (ASAS-3) --- spectral types F7/G2 + F/G (Houk) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LDS 377 comment Date: Mon, 18 Jan 2010 01:04:18 -0700 I notice that the secondary for this pair has no measurement other than the original estimate by Luyten. UCAC3 shows motion for the fainter star somewhat smaller than for the brighter star (HD 104197). I confirm this independently using 2MASS - USNO-A2.0, whose 18.2-year baseline gives: -81, +52 mas/year, i.e. even smaller than the UCAC3 motion, but perhaps with substantial uncertainty. The magnitude/color difference with the brighter star isn't consistent with the Houk type for the latter K0/1III + F:, though I'm pretty sure this is a G dwarf, not a K giant. The faint star is still very red if a dwarf (2MASS J-K = 0.9). This seems to be a case where the fainter star has motion parallel but not similar enough to the brighter one, but "more data are required". =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Double LkHA 312 + 313 Date: Thu, 21 Jan 2010 23:28:29 -0700 These two T Tau stars form a pair worth noting. They are resolved in 2MASS etc, and both shown as the 'secondary' of a pair in UCAC3. Presumably Herbig made mention of the pair in listing them. LkHA 313 = 2MASS J05471384+0000170 5 47 13.85 +00 00 17.1 (J2000, 2MASS) LkHA 312 = 2MASS J05471408+0000157 5 47 14.09 +00 00 15.7 (J2000, 2MASS) --- yes, LkHA 312 is the eastern component --- separation 3".8 in pa 110 from 2MASS astrometry --- combined V: 14.2 (ASAS-3) 13.9 (TASS MkIV) ...prob somewhat variable =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Note on WDS 05490+0108 = Gre 2 Date: Fri, 22 Jan 2010 12:30:51 -0700 If you need placeholders for blank columns on this one, the pa is about 10 deg, and delta-mag is ~0.75. The combined magnitude is 12.6 per ASAS-3, agreeing with the Gregorio-Hetem et al value. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: RJHA 38 + 37 double Date: Fri, 22 Jan 2010 13:43:39 -0700 Another pair from the Robertson & Jordan H-alpha emission objects paper (1989AJ.....98.1354R). They note this reasonably close pair of stars as items 37 and 38 in their list (star 38 is brighter). It is also a "5,6" pair in UCAC3, but no motions. The H-alpha emission was noticed as early as Dolidze's 1975 summary paper (1975AbaOB..47...3D --- the "all Dolidze" volume of the Abastumani Bulletins...). Her chart has the pair just resolved and seems to mark the pair together. That also references an earlier paper from 1964....well, all that is just re the H-alpha emission. RJHA 38 = 2MASS J06411651-0107403 = 3UC 178-044173 6 41 16.51 -01 07 40.3 (J2000, 2MASS) RJHA 37 = 2MASS J 06411657-0107344 = 3UC 178-044175 6 41 16.57 -01 07 34.5 (J2000, 2MASS) --- separation 5".9 in pa 9 (2MASS astrometry) --- combined V = 13.3 +/- 0.2 (TASS MkIV) V = 13.7 + 14.5 (my estimates from delta-m implied by CMC14 and UCAC3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06419-0131 = Bal 331 coords error Date: Fri, 22 Jan 2010 14:04:03 -0700 This has a poor position in the WDS, out ~100" mainly in Dec. The bright star is: Bal 331 A = 3UC 177-044485 6 41 50.64 -01 30 17.9 (J2000, UCAC3) --- the brighter star is a cool H-alpha emission star, and the other star a hotter ordinary star (roughly A type), so probably optical =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Cl* IC 2391 SHJM 4+5 Date: Mon, 25 Jan 2010 20:46:49 -0700 This another "somebody else's double" from a paper by Stauffer et al (1989ApJ...342..285S). It appears as a binary in UCAC3 with the usual bogus 'radial' proper motion for one of the stars. Though the authors suggest the pair are equally bright, the various DSS images indicate the southern component is brighter in the visible; 2MASS suggests the northern component is brighter in the near-IR (its position centered on that star). The pair are now designated separately as variables from later work. Cl* IC 2391 SHJM 4 = 3UC 075-043229 = V373 Vel 8 43 27.75 -52 57 39.2 (J2000, UCAC3) Cl* IC 2391 SHJM 5 = 3UC 075-043230 = 2MASS J08432785-5257358 = V372 Vel 8 43 27.86 -52 57 35.9 (J2000, UCAC3) --- separation 3".4 in pa 17 (UCAC3 astrom) --- combined V = 13.46, B-V = 1.39 (1989ApJ...342..285S) --- both are evidently late-K/early-M dwarfs with H-alpha emission (Stauffer paper figures 4b and 4d) --- the extended biblio indicates both are members of IC 2391 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Two more RJHA pairs Date: Tue, 26 Jan 2010 19:45:03 -0700 These two awaited reappearance of the 2MASS images at SkyView for verification. The primaries at least are nominal H-alpha emission stars reported in 1989AJ.....98.1354R. Both are close enough and delta-m large enough that they are unresolved in the regular astrometric catalogues. RJHA 3 AB = GSC 0048-0592 = 3UC 183-008254 = 2MASS J02512010+0128293 2 51 20.11 +01 28 29.3 (J2000, 2MASS) --- separation ~3" in pa ~45 --- combined V = 13.5, somewhat variable per ASAS-3 scatter; delta-mag ~2 (?) --- if the UCAC3 motion is correct --- it is 'radial' for the primary, but might be correct anyways, then the lack of relative motion between POSS-I and recent images suggests they are a common-motion pair RJHA 55 AB = GSC 4804-3400 = 3UC 176-046277 = 2MASS J06454343-0201523 6 45 43.43 -02 01 52.4 (J2000, 2MASS) --- separation ~3" in pa ~115 --- combined V ~13.5-13.7 (uncertain due to crowding in ASAS-3 and TASS data); delta-mag ~2 (?) --- this is in the CoRoT anticenter field, but I don't know how to interpret the results shown in VizieR for it (for instance, the three variability types and the notional temperature/spectral type are contradictory) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: EUVE J0831+40.2 pair Date: Sun, 31 Jan 2010 00:59:52 -0700 This pair has obviously been noticed previously, but isn't in the WDS. It is an x-ray bright pair of M dwarfs. Since the stars are a bit bright for SDSS, it is not resolved in the catalogue, but obvious especially in images from the two bluest colors. It is just resolved in UCAC3, but I think the separation there is too small (probably ~1".5 versus 0".6 in UCAC3) --- it is obviously oval on various DSS/2MASS images, whereas 0".6 would hardly show as other than circular. The large proper motion makes them certain to be physical. See the SIMBAD biblio for spectra. The primary seems to be the NW component, though Christian & Mathioudakis call it 'B'. The northwestern star is: 3UC 261-104826: 8 31 01.7 +40 12 11.5 (J2000) The UCAC3 motions are in the right direction, but probably either USNO-B1.0 or SDSS DR7 is more nearly correct. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StKM 1- 56 faint cpm companion Date: Sun, 31 Jan 2010 11:41:56 -0700 Happened to notice that the faint companion to this moderate-motion K dwarf from the Stephenson survey does indeed have common motion. The shift between POSS-I and 2MASS makes this clear. StKM 1-56 A = 3UC 181-001698 = 2MASS J00342635+0009031 = SDSS J003426.36+000902.8 0 34 26.36 +00 09 03.2 (J2000, 2MASS) StKM 1-56 B = 2MASS J00342667+0009066 = SDSS J003426.67+000906.4 0 34 26.67 +00 09 06.7 (J2000, 2MASS) --- separation 5".9 in pa 53 (2MASS, nominally ep 2000.66) --- V = 12.4 + 16.9, taking SDSS delta-mag ~4.5 [reported again inadvertently a week later....] From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StKM 1-56 cpm companion Date: Mon, 08 Feb 2010 22:32:52 -0700 I noticed this one when going over the first Stephenson K/M dwarfs list (1986AJ.....91..144S), but didn't report it since it was before the WDS was at VizieR. Pretty clear case since the companion is visible on the POSS-I scans and they've moved about 6" since then with no change in relative position. StKM 1-56 A = 3UC 181-001698 = 2MASS J00342635+0009031 = SDSS J003426.36+000902.8 0 34 26.36 +00 09 03.2 (J2000, UCAC3) StKM 1-56 B = 2MASS J00342667+0009066 = SDSS J003426.67+000906.4 0 34 26.68 +00 09 06.5 (J2000, SDSS DR7) --- separation 5".9 in pa 53 --- V = 12.4 + 16.4, assuming estimated delta-mag = 4.0 and combined V = 12.4 (TASS MkIV, ASAS-3) --- spectral type K5 (1986AJ.....91..144S, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: TYC 4500-1549-1 and cpm companion Date: Sun, 31 Jan 2010 12:17:54 -0700 The Tycho-2 star here was identified by Tachihara et al (2005A&A...437..919T) as a T Tauri-type star with H-alpha emission. UCAC3 shows this to have a common-motion companion of later spectral type. See their Table 3 for some additional binary candidates. TYC 4500-1549-1 = 3UC 339-002004 = 2MASS J00390619+7919096 0 39 06.19 +79 19 09.6 (J2000, UCAC3) 3UC 339-002002 = 2MASS J00390355+7919191 0 39 03.544 +79 19 19.1 (J2000, UCAC3) --- separation 12".0 in pa 322 --- V = 12.2 + 14.1 (2005A&A...437..919T) --- spectral type K6e for primary (2005A&A...437..919T) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: 2E 0042.9+4151 is a close pair Date: Sun, 31 Jan 2010 13:54:43 -0700 Okay, "close pair" as in oval on DSS/2MASS images. This is another x-ray source, in this case, almost certainly either an active K-dwarf pair or RS CVn-type system superposed in the foreground of M31. I estimate separation ~1".5 in pa ~100/280 (nearly equal). There are three entries for the object in SIMBAD, so I've sent a note about merging them. 2E 0042.9+4151 = 3UC 265-007463 = 2MASS J00454053+4208066 0 45 40.54 +42 08 06.6 (J2000, 2MASS) --- combined V = 12.7 (TASS MkIV) --- spectral type K4 (2009A&A...507..705B) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: PG 0105+276 components Date: Mon, 01 Feb 2010 22:39:50 -0700 This is apparently triple, as noted by Heber et al in 2002A&A...383..938H from HST images. A note linked in VizieR from Stark et al (2003AJ....126.1455S) sez: "Heber et al. (2002A&A...383..938H) report that this pair is resolved into three components with HST: the sdO is the northwest star of the "pair", while the southeast "companion" star resolves into two components separated from the sdO by 3.37 and 4.48 arcseconds." ...on DSS/2MASS images it looks merely double (no SDSS coverage in this area). It is resolved in some of the recent astrometric sources, including UCAC3 with wonky motions, and in CMC14. UCAC2 shows the NW comp, while 2MASS gives the fainter, redder SE comp. Coordinates for the hot NW component are: PG 0105+276: 1 08 16.60 +27 52 51.4 (J2000, UCAC2) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G270-185 is cpm pair Date: Mon, 01 Feb 2010 23:39:21 -0700 Looks as though this is a nice cpm pair of M dwarfs, resolved in the SDSS images. The pair together are listed by Luyten and in the Lowell proper motion survey. The Byurakan group classified them as type M3/4 (1998Ap.....41..356G = VizieR item III/246). G 270-185 A = SDSS J011738.83-091853.9 1 17 38.83 -09 18 53.8 (J2000, SDSS) G 270-185 B = SDSS J011738.91-091853.2 1 17 38.92 -09 18 53.2 (J2000, SDSS) --- separation 1".45 in pa 68.6 (SDSS epoch 2000.74) --- V = 14.9 + 15.6 (SDSS DR7 g+r/2), consistent with combined V = 14.3 +/- 0.3 (ASAS-3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StKM 1- 156 companion Date: Tue, 02 Feb 2010 12:22:59 -0700 Another Stephenson K dwarf that shows a companion in DSS/2MASS/SDSS images. It's a bit bright for SDSS, but is readily visible, and appears in the catalogue. StKM 1-156 A = SDSS J012614.39-221141.0 (etc) 1 26 14.38 -22 11 41.4 (J2000, SDSS DR7) StKM 1-156 B = SDSS J012614.55-221142.1 1 26 14.56 -22 11 42.1 (J2000, SDSS DR7) --- separation 2".5 in pa 107 (SDSS ep 1995.122, but astrometry might be poor due to both the primary being overexposed and the crowding of the secondary) --- V = 11.4 + 14.9 (SDSS g+r/2), consistent with combined V = 11.1 +/- 0.04 (ASAS-3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 13 has cool dwarf companion Date: Tue, 02 Feb 2010 13:47:42 -0700 This large-motion star, given also by Luyten and in the regular Lowell proper-motion catalogue (G 274-46) appears to have a common-motion companion. It shows nicely on the SDSS images, and the motion is clear from the POSS-I red plate. It is wide enough to be resolved in various catalogues. GD 13 A = L 883-542 = G 274-46 = GSC 6428-2139 = 3UC 127-003744 = 2MASS J01294004-2630051 1 29 40.07 -26 30 05.3 (J2000, UCAC3, evidently cribbed from Yale SPM) GD 13 B = GSC2.3 S09B000173 = 2MASS J01293975-2630013 1 29 39.76 -26 30 01.3 (J2000, 2MASS, poor astrometry) --- separation 5".5 in pa 225 (2MASS astrometry) --- combined V = 13.96 +/- 0.16 (ASAS-3) ....okay, getting around now to looking at SIMBAD, and this shows the pair is not new. Apparently first reported by Ben Zuckerman and Eric Becklin (1992ApJ...386..260Z). Looks as though some of the PG WD+dM binaries can be traced back to this paper, too. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LS I +62 164 companion Date: Tue, 02 Feb 2010 14:13:23 -0700 Here's a fun one: possibly a K + OB zeta Aurigae-type pair. For the moment I'm assuming the SW component is the hot star, since it is the fainter one in 2MASS images, but obviously the brighter in the blue per objective-prism spectra. The cool type, consistent with its systematic errors, is from the old Dearborn red stars catalogue. Assuming this is a physical pair, then it is the more evolved component, so I'll call it 'A'. Just resolved in the 2MASS catalogue. DO 24387 = 2MASS J01300536+6249125 1 30 05.36 +62 49 12.6 (J2000, 2MASS) LS I +62 164 = 2MASS J01300520+6249104 1 30 05.20 +62 49 10.5 (J2000, 2MASS) --- separation 2".4 in pa 28 (2MASS) --- V = 12.0 + 12.0, assuming equally bright in V combined V = 11.20 +/- 0.07 (TASS MkIV) --- spectral types K5 (1947AnDea...5....1L) B0 (1960IzKry..24..160B) OB (1959LS....C01....0H) --- AC2000: 1 30 05.29 +62 49 10.2 Tycho-2: 1 30 05.24 +62 49 10.7 ...both presumably blue biased (especially AC), so their coords are closer to the hot component =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: [TS74] 56 and friends Date: Tue, 02 Feb 2010 15:01:16 -0700 This M dwarf at the south galactic pole is presently passing a small-motion field star, but also has a common-motion companion. The three are resolved in 2MASS. Catalogued by Luyten and Giclas, but not as a double. The two are resolved in UCAC3 but with wonky motions. [TS74] 56 A = 3UC 121-001026 = 2MASS J00242383-2939443 = G 267-95 = L 881-74 0 24 23.83 -29 39 44.3 (J2000, 2MASS) [TS74] 56 B = 3UC 121-001027 = 2MASS J00242390-2939419 0 24 23.91 -29 39 42.0 (J2000, 2MASS) --- separation 5".9 in pa 45 --- V = 13.5 + 15.4, estimates using UCAC3 delta-m combined V = 12.60 +/- 0.07 (ASAS-3, for all three stars) --- spectral type M2 (1974A&A....36..155T, primary only) --- unrelated "recent" companion is: 2MASS J00242415-2939401 at: 0 24 24.15 -29 39 40.2 (J2000, 2MASS) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: [TS74] 366 wide pair Date: Tue, 02 Feb 2010 22:32:40 -0700 This star seems to have a wide common-motion companion of nearly the same color (M dwarf). The UCAC3 motions are similar, but they're based only on the link with SuperCOSMOS data, so are relatively weak. [TS74] 366 A = 3UC 116-002902 = 2MASS J01152878-3206104 1 15 28.78 -32 06 10.5 (J2000, UCAC3) [TS74] 366 B = 3UC 116-002903 = 2MASS J01152914-3206169 1 15 29.14 -32 06 16.9 (J2000, UCAC3) --- separation 7".9 in pa 145 (UCAC3 astrometry) --- V = 14.6 + 16.3 adopting UCAC3 delta-mag and combined V = 14.37 +/- 0.26 (ASAS-3); i.e. UCAC3 mag not far from Johnson V in this instance --- spectral type M3: (1974A&A....36..155T, primary only); 2MASS J-K = 0.87 and 0.81 (identical within errors) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+16 4872 cpm companion Date: Wed, 03 Feb 2010 01:43:53 -0700 I better claim this one before it gets away. While going over the StKM 1- list of stars in 2006, I happened to notice StKM 1-2099 had a rather faint common motion companion about 75" south. I added it to my big file with a 'photometric' type as a placeholder, thinking someone will get a legit spectrum eventually. More recently Eric Mamajek asked me about the source of the type, evidently since he'd looked up the primary star and noticed it. He thought it was a pretty good catch since it is so far away from the brighter star and so faint. Just luck on my part in this case. There doesn't seem to be a SIMBAD entry for it yet, so if he got any data it's not published yet. BD+16 4872 = StKM 1-2099 = TYC 1712-0224-1 = 3UC 215-330938 23 07 52.71 +17 10 15.2 (J2000, UCAC3) USNO-B1.0 1071-0706015 = 2MASS J23075222+1708573 23 07 52.23 +17 08 57.4 (J2000, USNO-B1.0) --- separation 78".1 in pa 185 (UCAC3 + USNO-B1.0) --- proper motions: +105.7, -81.0 (UCAC3 for primary) +108 , -72 (USNO-B1.0 for secondary) --- V = 10.8 + 18.4 (ASAS-3, GSC-2.3) --- spectral types K5 (1986AJ.....91..144S) K7e (1999A&A...341..163H) K3IV(e) (2000A&A...356..157L) ...for primary ...assume M for the secondary (J-K = 0.84) If the delta-mag is right, then the secondary is down around absolute mag Mv = 16, so a pretty late M dwarf. There is an optical companion to the brighter northern star, for which there is at least one published spectrum claiming it also has H-alpha emission, but I'm pretty sure this resulted from contamination from the brighter K-type x-ray source. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 02512+6023 = ADS 2165 comment Date: Mon, 08 Feb 2010 14:47:09 -0700 Happened to look at images for this, which seems to be one of the two co-dominant stars in IC 1848. I did find your recent paper with new observations for the central close binary. But I noticed some components not listed in the WDS that I thought would be present, given that there are 'N' companions already reported. Not sure there's anything to be done with them short of proper measurements, however. --- the 2MASS J and K images seem to show a reasonably bright companion maybe ~3" NW of the close AB pair...but is this possibly the I component with theta 180 deg off? --- component D seems to be a 2"-3" pair, with the somewhat fainter companion to the SE --- component G is a 1"-1".5 pair, oval in the 2MASS images [follow-up note on NWrn component] From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: WDS 02512+6023 = ADS 2165 comment Date: Mon, 08 Feb 2010 14:50:05 -0700 On Mon, 2010-02-08 at 14:47 -0700, Brian Skiff wrote: > > ...but is this > possibly the I component with theta 180 deg off? Ignore this---applies to WDS 02511+6025, so not related to this system. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LSPM binaries? Date: Mon, 08 Feb 2010 19:58:08 -0700 Have you guys gone to the trouble of including the "new" pairs found in the Lepine & Shara northern proper motion catalogue? Maybe still on the "to do" list? I have noticed one such apparently missing, but also involved in a bit of a complication. There is the pair WDS 00132+0536 = Plq 3, which the specs suggest is a wide optical pair. Curiously there is a third brighter star directly involved that is a large proper motion system including three common-motion components. NLTT 524-106 A = LSPM J0013+0535W = StKM 2-12 = DV Psc 0 13 09.20 +05 35 43.0 (J2000, UCAC2) --- Lepine finds common-motion companion at 5" NE, confirmed on DSS+2MASS images (LSPM J0013+0535E, cf VizieR listing) --- Pourbaix SB9 shows the primary to be a short-period (~0.4 days) double-lined binary with two independent sets of velocity data (see VizieR link) --- UCAC3 coords/motion cribbed from LSPM, despite there being the AC2000 entry for the primary, Tycho-2, etc---a disappointing "preliminary" aspect of this catalogue --- spectral types from my file: K4/5V (1986AJ.....92..139S) K5Ve (2006A&A...460..695T) ...presumably both for the short-period SB2 combined =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LF 5 +60 187 is double Date: Mon, 08 Feb 2010 20:13:48 -0700 This is a star from one of the Case objective-prism surveys (1955ApJS....2..123F). DSS and 2MASS images show a bump one side and it is resolved in SDSS images even if the primary is overexposed. LF 5 +60 187 A = [B60] +60 396 = 3UC 302-042899 1 41 36.71 +60 59 40.3 (J2000, UCAC3) LF 5 +60 187 B = SDSS J014137.07+605940.9 1 41 37.08 +60 59 41.0 (J2000, SDSS DR7) --- separation 2".7 in pa 75 (UCAC3 + SDSS) --- V = 10.8 + 13.8, assumes estimated delta-mag 3.0 and combined V = 10.69 +/- 0.07 (TASS MkIV) --- spectral type for primary: F5 (1955ApJS....2..123F and 1960IzKry..24..160B) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: VES 610 is double, plus a freebie Date: Mon, 08 Feb 2010 20:53:25 -0700 This is a star from the Vatican emission-line star survey (1978VatOP...1..257C). It is one of the many Be stars present in the open cluster NGC 663. It shows a faint companion to the NW. Only ~10" away is another fainter pair, probably unrelated. Dunno if you catalogue such cases separately or under the same designation. I'll leave them separate here. Again all four stars are nicely resolved in SDSS images. VES 610 A = GGA 93 = V973 Cas = 3UC 303-039277 1 45 37.81 +61 07 59.1 (J2000, UCAC3) VES 610 B = SDSS J014537.59+610801.9 1 45 37.60 +61 08 02.0 (J2000, SDSS DR) --- separation 3".2 in pa 332 (UCAC3 + SDSS) --- V = 12.5 + 15.5, assuming estimated delta-mag 3.0, and typical combined V = 12.4 (several sources shown in the WEBDA open cluster database) --- averaged B-V and U-B colors yield Johnson Q = -0.70, implying a B2 dwarf, typical of Be stars ...not far away: SDSS J014538.85+610750.9 SDSS J014538.61+610749.8 --- separation 2".08 in pa 235.4 (SDSS DR7) --- r' = 15.34 + 15.51 --- WEBDA shows multiple entries for the two stars, and perhaps the photometry is for the pair together, can't tell; could be that the combined V = 15.55, or that the two stars are each close that value....other evidence suggests the combined V is between 14.5 and 15, so the 15.5+15.5 case seems more likely =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Unresolved pairs Date: Mon, 08 Feb 2010 22:54:28 -0700 While going over some of the Stephenson K/M dwarfs (well, most of them are dwarfs), there are some cases where the stars are too close to be resolved cleanly in the various on-line images. On the one hand, they automatically need to be put on the list to be confirmed, but on the other, they're somewhat closer than the ones I've been sending, so presumably the likely orbital periods are more like decades/centuries rather than millenia. Two examples are: StKM 2-40: 0 34 08.48 +25 23 49.7 (J2000) I'm pretty sure this is a good 1" pair, but it is visible really only on the SDSS u image (saturated on the others). if you've looked a lot of pairs on the SDSS images, you know that it is not uncommon to see nice images for all the colors except u, where there are little companions that surely come from jittery seeing at the shorter wavelength. all the images in such a field will have the spurious companions, but this one does not. StKM 2-42: 0 36 03.89 +28 21 13.1 (J2000) in this case the star is a merged binary in the 2MASS images, perhaps an arcsec or so separation, and only slightly oval on the better DSS images. if there were Sloan coverage, they would be readily resolved It's not a big deal, since they'll show up again eventually in upcoming ground- or space-based surveys (GAIA etc). If you think they're worth noting for the current low-mass-star bandwagon, then I'll have a closer look at them. From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StKM 2-40 and -42 Date: Tue, 09 Feb 2010 18:44:31 -0700 The Sloan images are back at SkyView this evening.... StKM 2-40 A: 0 34 08.45 +25 23 49.5 (J2000, SDSS DR7) StKM 2-40 B: 0 34 08.52 +25 23 49.4 (read off SDSS SkyView image) --- separation 0".95 in pa 6 taking my estimate for the coords of secondary at face value --- V = 11.3 + 12.8 assuming estimated delta-m = 1.5 and combined V = 11.08 +/- 0.04 (ASAS-3) --- spectral type K5V (1986AJ.....92..139S, primary only) StKM 2-42: 0 36 03.89 +28 21 13.1 (J2000, UCAC2/3) --- separation/pa estimate: 1" in pa 210 (about 1/3 from 180 to 270) --- V = 12.3 + 13.3 assuming estimated delta-m = 1.0 and combined V = 11.98 +/- 0.05 (ASAS-3) --- spectral type K4V (1986AJ.....92..139S, prob combined type) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LP 765-74 cpm companion Date: Mon, 08 Feb 2010 23:10:54 -0700 I didn't look in detail, but the SIMBAD entry suggests Wroblewski & Torres (1996A&AS..115..481W) already noticed this one (surprisingly overlooked by both Luyten and Lowell). The UCAC3 entries are basically correct. The brighter star is: LP 765-74 = 3UC 150-001539: 0 37 36.30 -15 11 52.9 (J2000) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StKM 1-66 is double Date: Mon, 08 Feb 2010 23:34:50 -0700 Can't tell from catalogue data whether or not the motions are the same, but little relative change between POSS-I and modern stuff. StKM 1-66 A = 2MASS J00402678+1824310 = 3UC 217-002787/88 0 40 26.79 +18 24 31.1 (J2000, 2MASS) StKM 1-66 B = 2MASS J00402643+1824312 = 3UC 217-002785 0 40 26.43 +18 24 31.2 (J2000, 2MASS) --- separation 5".1 in pa 271 (2MASS astrom) --- V = 11.7 + 12.6, assuming UCAC3 delta-mag and combined V = 11.3 (TASS MkIV and ASAS-3) --- spectral type K5 (1986AJ.....91..144S for combined light) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Flo 135 is double Date: Tue, 09 Feb 2010 00:17:57 -0700 This one is off the beaten path, from Florsch's thesis paper (1972POStr...2....1F) with radial velocities near the SMC. It appears to be a good cpm pair resolved in AC2000, but a muddle in 2MASS and UCAC3. Taken as single hitherto in the literature. Flo 135 = GSC 9141-0232 = UCAC2 00856202 = AC2000 4399911 + 10 mid-point: 0 42 10.7 -74 13 55 (J2000, 2MASS) --- separation 2".0 in pa 176 (AC2000, ep 1909.84) 2".3 in pa 173 (2MASS, ep 2000.8) ...here I've taken the northern star as "truth" and taken the mean of the two southern positions to be the position of the secondary, jibes well with AC2000, amazingly enough 2".35 (UCAC3, separation in Dec only, again taking the mean of the two discordant values) ...you might be able to do better with stuff you have --- V = 11.8 + 12.3, taking AC2000 delta-mag, and combined V = 11.25 +/- 0.04 (ASAS-3) --- spectral type G2 (1972POStr...2....1F, combined type), which with the significant proper motion indicates a dwarf pair in the foreground of the SMC =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 00428+3533 = Tok 10 comment Date: Tue, 09 Feb 2010 00:27:52 -0700 Comparison of the POSS-I and later images shows the visual companion has rotated about 90 deg in a retrograde direction relative to the fast-moving primary in ~50 years. 4400y orbit? Say it ain't so! I think what's going on is exactly what the UCAC2 and UCAC3 proper motions indicate: the primary has large motion, and the secondary has much smaller (but still substantial) motion, and thus the bright guy has been scooting past the fainter star in recent decades. Optical pair. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD-08 133 is cpm pair Date: Tue, 09 Feb 2010 00:57:18 -0700 Another Stephenson star with a fainter companion visible (barely) on DSS and (very well) on 2MASS images. Apparently not noticed previously by Luyten or Lowell pm surveys. This is an Hipparcos star, so there's another 'free' parallax, too. BD-08 133 A = StKM 2-63 = UCAC2 29028471 = 3UC 165-002029/30 = 2MASS J00450146-0753432 0 45 01.47 -07 53 43.2 (J2000, 2MASS) BD-08 133 B = 2MASS J00450165-0753403 0 45 01.66 -07 53 40.3 (J2000, 2MASS) --- separation 4".1 in pa 46 (2MASS astrom) --- V = 10.9 + 13.9, assuming estimated delta-mag = 3.0 (smaller in the near-IR) and combined 10.87 +/- 0.04 (ASAS-3) --- spectral type K7V (1986AJ.....92..139S, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: KUV 16106+3820 trio Date: Tue, 09 Feb 2010 15:43:49 -0700 This was evidently reported as a WD/dM pair by Wachter et al (2003ApJ...586.1356W). There are three stars involved, however. Just as a hunch, the fainter third star is a background object the pair are passing by at present. SDSS DR7 shows 2 or 3 entries for each component, which I show averages of here, taking the white dwarf as the 'A' component. A: SDSS J161221.27+381226.4 = KUV 16106+3820 16 12 21.28 +38 12 26.4 (J2000, SDSS DR7) B: SDSS J161221.48+381229.5 16 12 21.48 +38 12 29.6 C: SDSS J161221.46+381234.3 16 12 21.47 +38 12 34.4 --- AB: 4".0 in pa 36 V = 16.8 + 18.8 (SDSS DR7 g+r/2) spectral types DA + (M) (1990AJ.....99..330W for the hot star, M type assumed from color) --- AC: 8".2 in pa 15 V = 16.8 + 19.3 (SDSS DR7 g+r/2) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Sh 2-148 center star Date: Wed, 10 Feb 2010 13:49:24 -0700 In going through a paper with spectral types for some northern HII regions, I notice that the center star for Sh 2-148 has at least three bright components within 2" or 3" radius on 2MASS images. Perhaps another one for your next autumn O-stars speckle run. Sh 2-148 1 = GSC 3997-2063 = 2MASS J22561719+5831179 22 56 17.19 +58 31 18.0 (J2000, 2MASS) --- combined V = 12.5 or so --- spectral type given variously between O8V and B0V =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Sh 2-241 center star is double Date: Wed, 10 Feb 2010 22:17:17 -0700 Another Sharpless HII region central star with a close companion. Partly merged on DSS/2MASS images, so the sep/pa below are estimates. Sh 2-241 1 = GSC 2419-1038 = 3UC 241-062388 6 03 58.62 +30 15 25.4 (J2000, UCAC3) 6 03 58.50 +30 15 23.3 --- separation 2".6 in pa 217 (UCAC3 for primary, RA/Dec estimate for secondary from 2MASS J image) --- V = 11.7 + 12.7, assuming estimated delta-m = 1.0 and combined V = 11.37 +/- 0.09 (TASS MkIV) --- spectral type B1.5V (1990AJ.....99..846H, prob primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Ruiz 439-162/3 faint cpm pair Date: Thu, 11 Feb 2010 15:12:05 -0700 This is one of several faint cpm pairs given with photometry and spectral types by Ruiz and Maza in 1988ApJ...335L..15R and 1990AJ.....99..995R. Might be one or two more in the second paper that are not already in the WDS. I'm collecting the spectral types, so will check. ESO 439-162 = USNO-B1.0 0586-0266838 11 29 52.05 -31 22 47.1 (J2000, USNO-B1.0) ESO 439-163: 11 29 53.8 -31 22 43 (my estimate from DSS images) --- Ruiz & Maza give separation of 23" in pa 306 --- motion of the primary from B1.0: -288, +212 mas/year from ndet = 5, so probably okay --- V = 18.77 + 19.84 (1990AJ.....99..995R); BVRI colors also shown in this paper --- spectral types DQ + DC9 (1990AJ.....99..995R) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: ESO 440-55 faint cpm pair Date: Thu, 11 Feb 2010 17:56:46 -0700 Another of the Ruiz & Maza pairs that doesn't seem to be in the WDS. ESO 440-55 A: 12 06 37.71 -31 37 06.2 (J2000, estimate) ESO 440-55 B: 12 06 37.66 -31 37 11.8 (J2000, USNO-B1.0) --- separation 5".6 in pa 7 --- V = 19.2 + 19.7 (1990AJ.....99..995R) --- spectral types DZ7 + M5.1 (1988AJ.....96.1965R) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: ESO 440-489/490 cpm pair Date: Thu, 11 Feb 2010 18:07:03 -0700 One more reported by Ruiz & Maza. ESO 440-489 = 3UC 115-144302 12 00 43.73 -32 47 21.8 (J2000, UCAC3) ESO 440-489 = 2MASS J12004439-3247240 12 00 44.40 -32 47 24.0 (J2000, 2MASS) --- separation 8".7 in pa 105 --- V = 15.3 + 16.0 (1990AJ.....99..995R) --- spectral types M3.7 + M4.3e (1990AJ.....99..995R) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Improved coords for LDS 4157 Date: Thu, 11 Feb 2010 18:39:35 -0700 This is a Ruiz & Maza pair, which they identify as an LDS object. The WDS coords are approximate; the WDS magnitudes and spectral types are obviously taken directly from 1990AJ.....99..995R. WDS 11545-2917 A = LDS 4157 A = USNO-B1.0 0607-0270810 11 54 25.37 -29 17 54.3 (J2000, USNO-B1.0) WDS 11545-2917 B = LDS 4157 B = USNO-B1.0 0607-0270813 11 54 26.06 -29 17 42.6 (J2000, USNO-B1.0) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: ESO 440-179/80 cpm? pair Date: Thu, 11 Feb 2010 19:19:19 -0700 Ruiz & Maza say this pair have common motion, but I am not able to confirm it independently. The fainter star passed close to field star in recent decades, so astrometry based on Schmidt plate scans is garbled (including UCAC3). R&M also show the spectral type of the fainter star being earlier than the primary despite the large delta-mag. ESO 440-179 = 3UC 121-148366 12 02 50.20 -29 47 19.5 (J2000, UCAC3) ESO 440-180 = 3UC 121-148370 12 02 54.32 -29 46 12.7 (J2000, UCAC3) --- separation 85".6 in pa 39 --- V = 12.7 + 16.3 (1990AJ.....99..995R) --- spectral types M4 + M3 (1990AJ.....99..995R) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: ESO 440-30/29 cpm pair Date: Thu, 11 Feb 2010 19:29:46 -0700 A faint fairly close pair noted by Ruiz & Maza. ESO 440- 30 = 2MASS J12040495-2821380 12 04 04.95 -28 21 38.0 (J2000, 2MASS) ESO 440- 29 = 2MASS J12040488-2821338 12 04 04.88 -28 21 33.9 (J2000, 2MASS) --- separation 4".2 in pa 347 --- third optical comp (AC): 5".3 in pa 270 --- V = 17.0 + 18.2 (1990AJ.....99..995R) --- spectral types M0 + M2 (1990AJ.....99..995R) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: ESO 440-387/86 cpm pair Date: Thu, 11 Feb 2010 19:37:09 -0700 The last of the Ruiz & Maza pairs from this paper. ESO 440-387 = 3UC 118-150130 11 52 37.39 -31 28 32.8 (J2000, UCAC3) ESO 440-386 = 3UC 118-150127 11 52 36.31 -31 28 34.5 (J2000, UCAC3) --- separation 14".0 in pa 263 --- V = 13.7 + 15.5 (1990AJ.....99..995R) --- spectral types K4 + M1 (1990AJ.....99..995R) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StKM 1-80 cpm companion Date: Sat, 13 Feb 2010 00:01:12 -0700 Another Stephenson modest-motion dwarf that has an easy-to-spot common-motion companion. StKM 1-80 = BD+26 122 = 3UC 235-004470 = 2MASS J00470469+2700196 0 47 04.72 +27 00 19.8 (J2000, UCAC3) 3UC 235-004477 = 2MASS J00470725+2700192 0 47 07.27 +27 00 19.2 (J2000, UCAC3) --- UCAC3 motion for 'B' is 2x in error, but coords probably okay --- separation 34".2 in pa 91 (USNO-A2.0, ep 1953.778) 34".4 in pa 91 (GSC-ACT, ep 1983.683) 33".8 in pa 92 (GSC-ACT, ep 1984.646) 34".2 in pa 91 (CMC14, ep 2001.6...) 34".2 in pa 91 (2MASS, ep 1997.8...) ...probably more such; USNO-B1.0 and the PPMX guys got the motion right for both stars --- V = 10.3 + 13.7 (ASAS-3 and TASS MkIV for the brighter star, estimate from CMC14 for the fainter one) --- spectral type K4/5 (1986AJ.....91..144S, primary only) =============================================================================== [same pair also sent on Feb 25, appended] From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 4913 cpm companion Date: Sat, 13 Feb 2010 00:43:21 -0700 An unexpected companion around a Luyten/Giclas star, indeed an HD star with an Hipparcos parallax. It is probably too close/ too-large delta-mag for Lepine to have picked it up without visual 'blinking' of POSS-I/II. Still I'm a little surprised that neither he nor Luyten spotted it. HD 4913 A = ....very well-catalogued ! HD 4913 B = GSC-2.3 NBTW011390 = 2MASS J00512228+1844120 0 51 22.28 +18 44 12.0 (J2000, 2MASS ep 1997.8) --- separation 12".5 in pa 142 (2MASS, coords a bit soft for the companion due to the blazing bright primary) --- V = 9.2 + 17 (published UBV for the primary, estimate for the secondary assuming GSC-2.3 I=14.9 is correct) --- spectral type K6V for primary, as recent as 2003AJ....126.2048G; if the secondary is really 8 mags down, then it's about M6 --- the pair are approaching a background mag 14 field star with near-zero motion From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 4913 faint cpm comp Date: Thu, 25 Feb 2010 14:58:47 -0700 Here's another one that has been surprisingly overlooked. The common motion is obvious between the POSS-I plates and recent images. A more distant optical companion (observed by Kuiper) may have distracted folks previously. This is a fairly nearby star (~20 pc), so we get a free parallax out of it, too. If my estimate of the magnitude is right, then the companion is not far above the hydrogen-burning limit. HD 4913 A = ...well-studied HD 4913 B = 2MASS 00512228+1844120 --- separation 12".5 in pa 142 (2MASS astrom ep 1997.7) --- V = 9.2 + 18 (the latter a rough estimate only) --- spectral type K6- V (2003AJ....126.2048G for primary) --- since the motion pair will be moving past it in the coming few years, it might be worth noting the background star is GSC 1191-0465 = UCAC2 38370896: 0 51 22.88 +18 44 05.1 (J2000, UCAC2), with epoch 2000.0 separation of 22".8 in pa 136 per the UCAC2 astrometry. Kuiper gave type K0 for this star. --- I already have this flagged as a cpm pair in my big file, so I must have noticed it some time ago. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: KUV 00300-1810 cpm companion Date: Sun, 14 Feb 2010 17:02:34 -0700 This starts another batch of Kiso uv-bright objects observed for spectral type by Gary Wegner (1990AJ....100.1274W). The first entry in their table is a common-motion pair with excellent SDSS DR7 astrometry and photometry. The linkage is obvious comparing the POSS-I scans with later stuff. The secondary is a lot fainter than the white dwarf, but is still moderately blue --- a cooler degenerate star? KUV 00300-1810 A = 3UC 145-001489 = SDSS J003230.45-175323.1 0 32 30.43 -17 53 22.4 (J2000, UCAC3) KUV 00300-1810 B = SDSS J003230.72-175320.8 0 32 30.72 -17 53 20.9 (J2000, SDSS DR7, ep 1994.95) --- separation 4".40 in pa 59.0 (SDSS DR7, ep 1994.9525) --- V = 16.7 + 18.4 (SDSS g+r/2) --- spectral type DA (1990AJ....100.1274W, primary only) --- proper motion for primary: 85.5, -65.5 mas/year (UCAC3) 64 , -70 (USNO-B1.0) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 02023-2634 = LDS 65 magnitudes Date: Tue, 16 Feb 2010 23:15:56 -0700 These guys are somewhat fainter than advertised. ASAS-3 shows combined V = 13.47 +/- 0.12. The various DSS/2MASS images suggest the delta-m is modest, and basically zero in UCAC3, but I'll leave that part up to you. Way-back-when, Kuiper estimated delta-m = 0.3 visually. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Early history for WDS 07048-3836 = Jao 4 ? Date: Thu, 18 Feb 2010 01:03:08 -0700 I'm having a look now at the Bidelman compilation of Kuiper's spectral types (1985ApJS...59..197B). I notice that for LTT 2729 = LHS 225, he shows two identical types for the pair from Kuiper, and quotes V mags to 0.01 precision from the (post-Kuiper) literature. Haven't been able to trace that photometry. But the implication is Kuiper saw it as double and got separate spectra circa 1940. Similarly, the Luyten 1979 NLTT file at VizieR shows the comment: "Has comp., 269d, 3" (1946)." Perhaps no traceable measurements of the pair prior to the more recent observations by the Georgia State group? From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: Early history for WDS 07048-3836 = Jao 4 ? Date: Thu, 18 Feb 2010 01:09:07 -0700 Also, Alistair Walker's entry for this in 1983SAAOC...7..106W shows it as 'AB'. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 07549-2920 = Kui 32 coords improvement Date: Thu, 18 Feb 2010 13:04:58 -0700 This one has approximate coordinates in the WDS. Kui 32 = 3UC 122-073043 = USNO-B1.0 0606-0149940 = 2MASS J07545478-2920559 7 54 54.80 -29 20 56.5 (J2000, 2003ApJ...582.1011S) 7 54 54.81 -29 20 56.3 (J2000, USNO-B1.0) 7 54 54.78 -29 20 55.9 (J2000, 2MASS ep 1999.1) 7 54 54.79 -29 20 56.2 (J2000, UCAC3) --- combined V = 12.83 +/- 0.09 (ASAS-3) Further to the Kuiper pair from last night, I looked this morning at all the relevant papers from that time (all in PASP or ApJ) shown by ADS, and didn't see anything. They all deal with northern stars, whereas hardly anything in Bidelman's compilation is north of even -10 Dec, with most stars down at -30, -40, -50! Kuiper must've been laying the McDonald 82-inch down low practically every night. Bidelman does say much of the material was unpublished. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11154-1807 = LDS 342 ABxC optical ? Date: Thu, 18 Feb 2010 21:19:03 -0700 I'm pretty sure that the 'C' component of this wide large-motion trio has similar but not the same motion as the closer 'AB' pair. pmA pmD source A: 294.43 -717.20 HIP1 346.33 -696.53 HIP2 B: 319.28 -708.04 HIP1 341.07 -690.32 HIP2 C: 128.9 -730.9 ACRS 148 -736 USNO-B1.0 138.5 -742.4 NOMAD 138.2 -747.6 Salim & Gould 138 -748 UCAC3 (pm = Salim & Gould rounded?) VizieR does not show any other high-quality motions for A,B that are independent of Hipparcos. Note however the NPM1 motions seem to be the same within errors, and are that of the C component (most of the compilation catalogues follow Luyten by making them all the same as the AB pair motion...). The three might bear looking into with sources you have. The various radial velocities available are equivocal, though the ones published for A and B are different than the single one available for C. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 12298-0527 = B 2737 magnitudes Date: Fri, 19 Feb 2010 20:06:06 -0700 These guys are somewhat fainter than advertised, at least if V magnitudes are intended. ASAS-3 shows combined V = 12.79, and delta-mag looks okay, so I get V = 13.2 + 14.2. Kuiper/Bidelman gives the types as M3.5 + M3.5:. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 12478-0836 = Brt 440 mix-up? (and new pair) Date: Fri, 19 Feb 2010 21:44:30 -0700 I'm pretty sure that Brt 440 is not real as described, but results from some funny in the AC measurements. This seems to be securely identified with the large-proper-motion star LHS 5228, and it could be that the motion itself resulted in the apparent double due to the coordinates at slightly different epochs. _But_ I'm also pretty sure this is a common-motion pair, involving a much fainter companion on the west side of the primary. It shows up on the SDSS images at longer wavelengths and also in the 2MASS images. LHS 5228 A = UCAC2 28734104 = 2MASS J12474687-0836168 12 47 46.90 -08 36 16.8 (J2000, UCAC2) LHS 5228 B = 2MASS J12474687-0836168 12 47 46.88 -08 36 16.9 (2MASS, epoch 2000.4) --- separation 4".8 in pa 267 (2MASS astrom) --- V = 12.0 + 19.0 (published V for primary, and SDSS g+r/2 for secondary, probably highly uncertain due to crowding and large delta-m [primary saturated]) --- spectral type M1 (Kuiper, 1985ApJS...59..197B, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 112575 cpm companion Date: Fri, 19 Feb 2010 22:19:46 -0700 Bidelman (1985ApJS...59..197B) marks this as 'optical', but DSS/2MASS images show clearly that this is a common-motion pair observed by Kuiper. UCAC3 resolves them but gives no motion for the secondary. HD 112575 A = TYC 5542-0842-1 = UCAC2 26680769 (etc) 12 57 43.95 -14 27 48.7 (J2000, UCAC2) HD 112575 B = 3UC 152-141405 [but no pm] = 2MASS J12574358-1427455 12 57 43.58 -14 27 45.6 (J2000, 2MASS) --- separation 6".4 in pa 300 (2MASS astrom) --- V = 9.1 + 12.9 (adopting UCAC3 delta-m and published combined V) --- spectral types K4.5V + K5: (2006AJ....132..161G for primary, and Kuiper's uncertain type for the secondary, which is probably actually an early-M dwarf --- Kuiper's spectrum was probably contaminated by the primary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Comment on WDS 13020-0205 = Oso 49 Date: Fri, 19 Feb 2010 22:34:12 -0700 DSS/2MASS/SDSS images show that this pair is optical. The secondary is fixed: USNO-A2.0 0825-07893047: 13 02 02.66 -02 05 21.1 ep 1956.204 2MASS J13020266-0205206: 13 02 02.66 -02 05 20.7 ep 1999.1 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 18432-3323 = Jao 6 comment Date: Sun, 21 Feb 2010 16:02:09 -0700 Looks like the magnitude for the secondary is wrong, probably just a typo, and it should be 16.07 rather than 6.07. The K magnitude of the primary is 6.-something, but the companion is down around K=9.8, but presumably neither of those is what's intended. V of 16 or 16.5 looks about right. By the way, the V=10.62 from the Mermilliod UBV catalogue must apply to the star ~1'.5 north; this is confirmed by the ASAS-3 photometry to within ~0.02. The UBV colors are also consistent with 2MASS (i.e. a little-reddened K0 giant) . The Geneva seven-color photometry and ASAS-3 agree that the primary has V = 10.3 (Geneva 10.282, ASAS-3 10.30 +/- 0.02), and is appropriately red. A rough extrapolation suggests the motion star and the V=10.6 star were pretty close at the time of the CD+CPD, so the designation could well apply to the optical pair circa 1890! Finally, Kuiper gave type M2 for the primary per the Bidelman compilation 1985ApJS...59..197B. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD-05 4764 trio Date: Sun, 21 Feb 2010 17:45:47 -0700 I have this marked as double from a list prepared several years ago, but a new inspection shows it is triple. The two brighter stars have similar color so I suspect they are related, whereas the fainter third star is a background object (merely my hunch). The AB pair are present as far back as the AC, whose shift in coordinates with near-fixed separation suggests common motion. There's CMC14, UCAC3, and 2MASS amongst the modern measurements. BD-05 4764 A = 3UC 169-208640 = 2MASS J18480103-0538562 18 48 01.04 -05 38 56.3 (J2000, 2MASS) BD-05 4764 B = 3UC 169-208650 = 2MASS J18480120-0539053 18 48 01.21 -05 39 05.4 (J2000, 2MASS) BD-05 4764 C = 3UC 169-208651 = 2MASS J18480123-0539000 18 48 01.23 -05 39 00.0 (J2000, 2MASS) --- AB: 9".4 in pa 165 (2MASS) 9".2 in pa 162 (AC2000, ep ~1897, single obs for B) AC: 4".7 in pa 142 (2MASS) --- V = 11.6 + 11.8 + 14.3 (UCAC3 figures taken as V, consistent with ASAS-3 combined V = 10.86 +/- 0.03) --- spectral type A0V (1935MeUpp..61....1S, for A+B) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 18563-0425 = LDS 659 comment Date: Mon, 22 Feb 2010 13:00:54 -0700 Either this wide cpm pair has some relative motion or there's been some mix-up in the astrometry. It's in a crowded field, so misidentification of the faint secondary is possible. Various astrometry in VizieR gives: rho theta source epoch 27".0 196 USNO-A2.0 1954.416 22".5 196 GSC-ACT 1986.651 21".1 197 2MASS 1999.4 Interestingly, Schuster cites radial velocities of +70.7 and -92.6 km/s for the primary and secondary, resp (J/A+A/445/939 in VizieR). If these are correct, then obviously the stars are unrelated. Various proper motions hint that the fainter star has somewhat smaller motion. This suggests the pair is one where the motions are similar but they are in fact an optical pair. Kuiper, by the way, gave types for K0 and G2:. There is enough modern data to show that these are not so great: the primary is mid-G (Houk gave G6V) while the secondary is mid-K. It could be that he observed the close optical companion present circa 1940 (now well north of the motion pair) and not the correct secondary. =============================================================================== [RETRACTED --- IS A SLOAN 'RED LEAK' BINARY] From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Wolf 937 companion Date: Mon, 22 Feb 2010 21:12:10 -0700 This appears to have a close companion on the SDSS u-band image, so is unconfirmed. Nearby stars are not double as this one is. Wolf 937 A = 2MASS J21450079-0547128 = SDSS J214500.70-054715.4 21 45 00.77 -05 47 13.4 (J2000, SDSS DR7) --- separation 2".7 in pa 212 (SDSS coords for A, estimate from SkyView image for B, epoch 2004.71) --- V = 13.1 + 15.1 (from estimated delta-mag = 2.0 and combined V = 12.9) --- spectral type M3.5 (Kuiper via Bidelman 1985ApJS...59..197B for primary only) =============================================================================== [RETRACTED --- IS A SLOAN 'RED LEAK' BINARY] From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, b.burningham@herts.ac.uk, sleggett@gemini.edu Subject: Wolf 940 third component Date: Tue, 23 Feb 2010 12:49:28 -0700 While going over the star-list by Kuiper compiled posthumously by Bidelman (1985ApJS...59..197B), I noticed that Wolf 940 (which Bidelman lists as LTT 8692) has a close companion. It is visible only on the SDSS u-band image; in the other bands the star is saturated. This is a little worrisome, since seeing jitter can produce false companions in the u' images especially. However, other somewhat brighter stars within a couple arcminutes radius show no such companions. In checking to see that this was new, I found the recent MNRAS paper by Burningham et al (http://arxiv.org/abs/0902.1812) which announces a very faint type T8.5 object in the same system. This lies some 30" away to the southwest. Evidently the data available to them, looking at very faint limits, has the primary star completely burned out. Measuring from the SDSS image, I estimate the new star is at 1".8 in pa 205 from Wolf 940. Using a rough delta-mag = 2.0, the components are V = 12.9 + 14.9. I should note that the companion is not present at the SDSS-epoch position in earlier DSS images, so this is almost certainly a common-motion companion. A bright object like this is not of such astrophysical interest as the Jupiter-like body that Burningham et al have identified, but there do seem to be at least three bodies in the system. If the close companion were cool, I would expect it to appear in the 2MASS images, but there's no hint of it. So it must be some sort of hotter degenerate star, consistent with the "old" age derived by Burningham et al. From: Brian Skiff Reply-To: bas@lowell.edu To: Sandy Leggett Cc: b.burningham@herts.ac.uk, bdm@usno.navy.mil Subject: NO third component in Wolf 940 system ! Date: Wed, 24 Feb 2010 18:40:59 -0700 Well, I learned something today! As I chugged away today on the Kuiper list (1985ApJS...59..197B), I continued to notice possible doubles where there was Sloan coverage for stars bright enough that they were unsaturated only on the u-band exposures. Too many of them; something's not right. I came to a halt on the trio Wolf 1561, which is a well-known wide cpm pair that has a faint third (known) star near the southwestern component. This was found by Beuzit et al (2004A&A...425..997B). However, the SDSS u image shows _both_ main components to have apparent companions at the identical separation and position angle. This suggested there is some kind of ghost image involved. I've mentioned previously the (likely) seeing-induced false companions, which always look squiggly and also affect all stars in a field. These nice, sharp double images were only on the red stars. It took me half the afternoon to realize these must result from a red leak in the Sloan u filter. All the published filter transmission curves show transmission only in the near-uv as one expects. However, a poke around the SDSS web pages indicates that there is indeed a significant red leak. The interference coatings for the u filters were designed to block the red, but under the vacuum in the camera, the red-block wavelength shifted, and the red leak is present after all. The various SDSS pages mentioning this deal with the added flux in the u filter especially for redshifted galaxies, which influences the cosmological interpretation. For most of the sky covered by SDSS, of course, the extra far-red flux is well within the psf, so the u-band fluxes are simply too bright. It's a only a few percent transmission, but of course the M dwarfs are 100x brighter there! Down south of the Equator, where I've been looking, the red leak appears as a detached image due to atmospheric dispersion. I noticed that all the "new" pairs were about 2" separation and about pa 180 +/- 20 deg --- so the Sloan telescope scans were not always on the meridian. The ~2" dispersion is about what you'd expect for a single image split between say ~3800A and ~8000A. I tested this by looking at some dozens of red stars from the Lowell 'GR' stars catalogue, which are mostly south of the Equator and in the south galactic cap. _All_ the red stars that were bright enough showed as double in the Sloan u-band images. Damn! Luckily, pairs that I've reported from that list were assessed more conservatively, insisting that they appear oval/bi-lobed/resolved on multiple images from DSS/2MASS/Sloan. So all the new GR pairs that I reexamined today were confirmed. The third star in Wolf 940 is one of these 'red leak' companions, and is not celestial. My apologies for this. I've sent Brian Mason a few others of these "Sloan u only" pairs in the past week, so I'll revisit those this evening so I can tell you which ones need to be retracted. =============================================================================== [RETRACTED --- IS A SLOAN 'RED LEAK' BINARY] From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Wolf 1551 companion Date: Wed, 24 Feb 2010 11:39:26 -0700 Another Kuiper star with a faint companion visible only on the SDSS u' band image, this time at least sanctioned by having two SDSS catalogue entries. I checked stars nearby to see that they lacked such companions. Wolf 1551 A = UCAC2 28649994 = SDSS J220909.63-090341.7 22 09 09.63 -09 03 41.7 (J2000, UCAC2) Wolf 1551 B = SDSS J220909.62-090343.8 22 09 09.63 -09 03 43.9 (J2000, SDSS DR7, ep 2000.6742) --- separation 2".16 in pa 181.6 (SDSS astrom ep 2000.6742) --- V = 14.4 + 17.7 (SDSS g+r/2), consistent with combined V = 13.94 +/- 0.17 (ASAS-3) --- spectral type M1: (Kuiper via Bidelman 1985ApJS...59..197B) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 69-14 cpm companion Date: Thu, 25 Feb 2010 13:13:10 -0700 I'm now starting into the northern section of the Kuiper list by Bidelman (1985ApJS...59..197B). Bidelman shows the alias BD+21 89 for this star, but that is not a proper motion object. However, it appears that this is indeed the star Kuiper observed, since the spectral types are much more consistent with that wide (likely optical) pair than the large-motion one. The motion pair are fairly close, so the following are my estimates from the 2MASS J image --- readily visible however also on the DSS images (ahem). This pair is receding from another wider matched pair that seem to have identical colors, so I show them below as a potential physical binary. At the time of the POSS-I plates the motion pair was passing by these, and so catalogued motion is uncertain for the fainter guys. G 69-14 A = TYC 1738-1405-1 [no pm] = UCAC2 39783084 = 2MASS J00425668+2239350 0 42 56.76 +22 39 34.7 (J2000, UCAC2) --- separation 3".5 in pa 325 (estimate from 2MASS image) --- V = 11.7 + 13.7 (estimated delta-mag and combined V = 11.55) --- B-V = 1.44, U-B = 1.18 per Mermilliod UBV compilation, and TASS MkIV V-I = 2.0, so evidently the primary is close to M0 the faint pair: 2MASS J00425564+2239371 0 42 55.64 +22 39 37.1 (J2000, 2MASS) 2MASS J00425550+2239428 0 42 55.50 +22 39 42.9 (J2000, 2MASS) --- separation 6".05 in pa 341.6 (2MASS, ep 1997.8) --- V = 17. + 17. (estimates) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Kui 11 B is optical Date: Sat, 27 Feb 2010 15:38:21 -0700 Looks as though the star called Kui 11 AB in the WDS is an optical companion. At the time of the POSS-I plates it was not far NW of the primary, but in AC2000 it was ~39" SE. It is currently way off to the NW due to the large motion of the primary. Kuiper must have figured this out between 1931 and the time he got spectra ~1940, since his companion spectral type (M3) is good for the more distant Luyten common-motion companion (but not for the field star). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Ross 384 cpm companion Date: Sun, 28 Feb 2010 13:17:53 -0700 The north is pretty well studied for companions, it seems, but here's a rare one that is evident on many available images. Delta-m is large enough that they are not resolved in the SDSS or 2MASS catalogues. Ross 384 A = UCAC2 36946444 = NLTT 14339 = 2MASS J05005257+1431464 5 00 52.56 +14 31 46.7 (J2000, UCAC2) --- separation 2".5 in pa 320 (+/- 0".2 from estimates on SDSS images; SDSS catalogue epoch is 1995.076, but epoch inferred from SkyView coordinates is post-2000) --- V = 13.6 + 16.6 (estimated delta-mag of 3.0 and combined V = 13.54 +/- 0.16 from ASAS-3) --- spectral type K4: (Kuiper via Bidelman 1985ApJS...59..197B for primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06320+3432 = Gic 63 comment Date: Sun, 28 Feb 2010 20:57:14 -0700 I'm pretty sure the separation of the cpm AB pair here has not changed down to 12", but is still close to 15". To wit: 14".72 in pa 186.1 (2MASS, ep 1998.15) 15".13 in pa 185.9 (CMC14, ep 2003.2) The CMC14 specs are from a single observation, so roughly +/- 0".3 uncertainty in the coordinates for the two stars. Salim & Gould (2003ApJ...582.1011S) picked the C component as the co-moving companion, and assigned the large motion to that star in error. Kuiper gave the spectral types as K7 + M5; there are possibly more modern data I haven't indexed yet (the primary is K5 in the HDE). He also classified the C component as K5:, which is consistent with photometric colors and the near-zero motion indicating a background K giant. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06438+5108 = LDS 6200 comment Date: Sun, 28 Feb 2010 21:39:02 -0700 If it helps as a placeholder, the position angle is about 290. A quick search using VizieR for WDS entries with 0 observations shows there's a couple hundred of these. Might make a good project for the JDSO crowd to pick through these. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+19 1739 faint cpm companion Date: Mon, 01 Mar 2010 00:56:50 -0700 Another faint one hiding in the wings of a bright motion star; a free parallax, too, for this one. The star is recorded by both USNO-B1.0 and GSC-2.3. While B1.0 assigns the epoch 1950 to the position, this can't be right, since the primary was sitting at nearly the same spot in 1950. GSC-2.3 shows epoch 1998.872, so the following applies 1.13 years of proper motion to get the offsets for 2000 (which are the only good ones for the primary). BD+19 1739 A = UCAC2 38783746 7 28 33.57 +19 39 11.0 (J2000, UCAC2) BD+19 1739 B = GSC2.3 N8JJ020017 = USNO-B1.0 1096-0145862 7 28 33.25 +19 39 33.9 (GSC-2.3 adjusted to J2000) --- separation 23".4 in pa 349 per above coords --- V = 9.26 + 18.2 (published V for primary, USNO-B1.0 b+r/2 for secondary) --- spectral type G8 (Kuiper via Bidelman 1985ApJS...59..197B) K0 (probably Cannon in Boss General Catalogue) G5 (Vyssotsky in 1952CoRut..32....1H) ...B-V = 0.77 and b-y = 0.46, so G8 is about right. if delta-mag is right, then the secondary is only down around type M5; the photographic appearance between the two stars is a nice example of how intrinsically faint a mid-M dwarf is compared to something like the Sun (the primary is about 1 mag fainter than the Sun in absolute magnitude) --- Kuiper classified the optical companion presently about 15" SW as type G?, which is consistent with 2MASS colors =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Magnitudes for WDS 08559+4632 = LDS 908 Date: Mon, 01 Mar 2010 21:51:20 -0700 The magnitudes for this pair are somewhat too bright in the WDS. The TASS MkIV catalogue shows combined V = 11.81 +/- 0.06. Adopting the CMC14 delta-mag of 0.3, I get V = 12.4 + 12.7 for the two components. Kuiper called them each spectral type K5. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Wolf 357 faint companion Date: Mon, 01 Mar 2010 22:08:37 -0700 This one comes up on the three longer-wavelength SDSS images (though the primary is overexposed) and in 2MASS images. Curiously, the star is flagged as double in the Mermilliod UBV compilation, so evidently someone has noticed it previously. Nothing in the SIMBAD biblio however. Wolf 357 = TYC 2516-0129-1 = UCAC2 44662164 10 22 14.01 +36 49 07.1 (J2000, UCAC2) --- separation 3".6 in pa 349 (estimates from SDSS images nominally either epoch 2003.3161 or 2004.1297) --- V = 10.9 + 17.5 (published V for primary, rough average of SDSS g+r/2 for secondary) --- spectral type K2 (Kuiper via Bidelman 1985ApJS...59..197B for primary, apparently the only one published) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+46 1635 faint cpm comp Date: Mon, 01 Mar 2010 23:28:32 -0700 One more faint red companion to a well-studied large-motion star. Due to the fairly small separation and large delta-m getting positions for the secondary is difficult, so the sep/pa are more uncertain than usual. BD+46 1635 = UCAC2 47315015 = LHS 2279 = 2MASS J10312431+4531347 10 31 24.22 +45 31 33.8 (J2000, UCAC2) --- separation 4".8 in pa 90 (estimate from SDSS+2MASS images) --- V = 8.9 + 18? (published V for primary, very uncertain estimate for secondary) --- spectral type K7V (2003AJ....126.2048G, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Ross 894 cpm companion Date: Tue, 02 Mar 2010 01:23:54 -0700 Should have noticed this one myself when I went over the StKM 2- stars. Not found by Luyten, Giclas, or LSPM (shoulda been easy for any of them), but Kuiper did notice it and got spectra of both stars, though the secondary was probably too faint for him to get a decent exposure. The pair are distinctly wider and at larger position-angle on the POSS-I plates; I show an average of relative position estimates using SkyView (the two estimates were consistent to a couple tenths of an arcsec). Ross 894 A = UCAC2 41370536 = 2MASS J10563482+2722051 10 56 34.79 +27 22 05.1 (J2000, UCAC2) Ross 894 B = 3UC 235-103302 [no motion] = 2MASS J10563455+2722015 = SDSS J105634.51+272201.2 --- separation 5".1 in pa 225 (2MASS astrom, epoch 1998.2) 9".3 in pa 245 (POSS-I scans, epoch 1955.221) --- V = 12.2 + 15.8, adopting UCAC3 delta-mag and combined V = 12.11 +/- 0.06 from ASAS-3 --- spectral types K5: + K6? (Kuiper via Bidelman compilation 1985ApJS...59..197B); also K5V for primary from Stephenson 1986AJ.....92..139S, where it is StKM 2-680. based on the delta-mag, the secondary has to be around M3 or so. From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: Ross 894 cpm companion Date: Tue, 02 Mar 2010 11:20:35 -0700 Given the orbital motion evident between the POSS-I and recent stuff for this pair, I looked in our Pluto Camera plate collection for older plates. The oldest exposure is from UT 1932 April 2. The pair is readily visible and well resolved, though the companion is faint (B ~17.2). Using the micrometer on our blink comparator, I got 9".8 in pa 250, which should be regarded as quite approximate---the image-scale of the projection apparatus is too small for something like this (only 0.08mm on the plate). If we still had our PDS machine, it would be easy! Anyway, this is consistent at least with the later measurements, but if there's ever an orbit determined, I'm sure the residuals will be substantial. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 11-29 is cpm pair Date: Tue, 02 Mar 2010 20:20:01 -0700 Another easy one missed by Luyten and Giclas. It is just south of the Equator for J2000, so perhaps Sebastien Lepine has it waiting unpublished. G 11-29 A = UCAC2 31688686 = SDSS J115354.60-000717.7 = 2MASS J11535463-0007173 11 53 54.63 -00 07 17.5 (J2000, UCAC2) --- separation 9".46 in pa 286.1 (USNO-A2.0, epoch 1952.084) 9".60 in pa 285.0 (GSC-2.3, epoch 1996.290) 9".76 in pa 295.8 (DENIS, epoch 1997.2) 9".74 in pa 286.4 (SDSS DR7, epoch 1999.2206) 9".67 in pa 284.7 (CMC14, epoch 1999.5) 9".77 in pa 285.5 (2MASS, epoch 2000.3) 9".77 in pa 285.6 (2005MNRAS.360...81D, epoch ?) ...the last item from data taken with the 2.4m Isaac Newton telescope, so should have image-scale comparable to SDSS --- V = 13.6 + 16.0 adopting MGC delta-mag and combined V = 13.5 (ASAS-3) --- spectral type M0 (Kuiper via Bidelman 1985ApJS...59..197B for primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: EUVE J1206+70.1 cpm pair Date: Tue, 02 Mar 2010 21:43:11 -0700 Not a Kuiper star but.... this one is evidently not new, but I'm not sure who it should be assigned to. Lepine doesn't flag it as one of his own, so perhaps one of the follow-up observers for the uv/x-ray source should get it. The astrometry is a bit mixed, but UCAC3 seems to have it right and with motions for both objects, which I'll adopt for now. Lepine shows two entries, but the coordinates are rather poor; they are resolved in GSC-2.3. EUVE J1206+70.1 A = 3UC 321-046288 12 06 55.76 +70 07 49.0 (J2000, UCAC3) EUVE J1206+70.1 B = 3UC 321-046289 12 06 56.72 +70 07 51.6 (J2000, UCAC3) --- separation 5".54 in pa 62.6 (UCAC3 astrom) --- V = 12.4 + 15.0 (adopting UCAC3 delta-mag and TASS MkIV combined V = 12.28 +/- 0.11) --- spectral types M2.5V + M4Ve (2001AJ....122..378C) --- recorded evidently as single in 2006AJ....132..866R (spectral type given as M3 and distance 20pc) and 2007AJ....133.2825R (type M3.5, distance 5.1pc); if the earlier type above is correct for the primary, then it's more like 25pc --- still close enough to be interesting --- the SIMBAD headers flags these as double, attributing them to my B/mk file B-) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+05 2592 faint companion Date: Tue, 02 Mar 2010 22:23:17 -0700 This one comes up on the SDSS z image, but the primary is toasted there, so the measurements come from 2MASS, where is it resolved in the catalogue despite the fairly close separation. Good Hipparcos parallax for this one as well. BD+05 2592 A = UCAC2 33226715 = TYC 0284-0350-1 = 2MASS J12101159+0418284 12 10 11.59 +04 18 28.5 (J2000, UCAC2) BD+05 2592 B = 2MASS J12101183+0418286 12 10 11.84 +04 18 28.7 (J2000, 2MASS) --- separation 3".66 in pa 87.0 (2MASS astrom) --- V = 9.2 + 15? (published V for the primary, a mere guess for the secondary) --- spectral type K3 (Kuiper via Bidelman 1985ApJS...59..197B) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Ross 995 companion Date: Thu, 04 Mar 2010 15:21:29 -0700 A fairly close one this time, reasonably visible on the SDSS g images. Ross 995 A = UCAC2 37011851 = SDSS J145941.04+145843.4 = 2MASS J14594110+1458453 14 59 41.09 +14 58 45.1 (J2000, UCAC2) Ross 995 B = SDSS J145941.09+145842.0 --- separation 1".59 in pa 156 (SDSS DR7, epoch 2005.3535) --- V = 12.9 + 15.4 (TASS MkIV for primary, SDSS g+r/2 for secondary) --- spectral type M0 (Kuiper via Bidelman 1985ApJS...59..197B) =============================================================================== [2010 Mar 7, lost e-mails] LTT 14767 16 01 16.29 +37 14 21.2 1".5 cpm pair HD 150281 16 39 49.99 +05 30 26.0 SErn of 3".5 cpm pair one more ? =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 234344 cpm companion Date: Mon, 08 Mar 2010 12:58:33 -0700 It may not have been noticed that a faint late-M dwarf in the field of this star has common proper motion. Missed by Lepine (only R mag ~20.5) and not in the WDS. HD 234344 A = BD+50 2330 = AG+50 1187 16 46 07.64 +50 20 41.2 (J2000, Tycho-2) HD 234344 B = 2MASS J16461148+5019456 = USNO-B1.0 1403-0289192 = SDSS J164611.41+501948.5 16 46 11.47 +50 19 46.3 (J2000, SDSS DR7) --- separation 66".0 in pa 146.2 (Tycho-2 minus SDSS DR7, ep 2000.0) --- V = 9.5 + 21.4 (Tycho-2/TASS MkIV for primary, SDSS g+r/2 for secondary) --- spectral types K3 + M7V (Kuiper via Bidelman 1985ApJS...59..197B for primary, 2003AJ....126.2421C for secondary) --- proper motions: A -90.8 405.4 (Tycho-2) -89.2 406.1 (Hip1) -89.4 406.8 (Hip2) B -99 413 (SDSS DR7) -98 414 (USNO-B1.0 from n=3, but two additional plates not linked) -97 418 (difference of APM-Cambridge scans of POSS-I, where it is recorded on overlapping red plates, and 2MASS) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 17177+3537 mix-up ? Date: Mon, 08 Mar 2010 15:09:23 -0700 There are what seem to be two distinct pairs here listed at the same coordinates in the WDS. There seem to be three pairs in the field, however. The WDS entry will need some disambiguation, but I'm not sure how to parse it out. For starters, it looks to me as though the Hough/Couteau system must be HD 156712 off to the NW: HD 156712 = ADS 10453: 17 17 44.24 +35 37 02.9 (J2000, Tycho-2) 8".01 in pa 272.4 (2MASS, epoch 1998.35) --- maybe the closer Couteau pair is buried in there, but I can't see it in the usual images; also the suggestion from the DSS1/2 images is that the separation for AB has been increasing, consistent with the start/end separations shown in the WDS, but _not_ the position angles. I suspect the measurements for different pairs could be intermingled. --- WDS spectral type A2 is for the primary here; near-zero proper motion Now the proper motion star Wolf 676 (at the current WDS coords) is also a common motion pair, for which I get: V = 13.6 + 15.1; 4".71 in pa 261.1 (2MASS, epoch 1998.35). Kuiper type is M3. This does not seem to match anything closely except the 1884 Hough observation--- but would he have looked at such a faint star back then? Looking for something to match the data shown, I noticed a third very similar pair in the field: TYC 2600-0501-1 = UCAC2 44322088 17 17 37.96 +35 32 24.2 (J2000, UCAC2) 2MASS J17173760+3532222: 17 17 37.61 +35 32 22.2 (J2000, 2MASS) --- separation 4".71 in pa 246.2 (2MASS, epoch 1998.35) --- V = 11.8 + 14.3 (2MASS delta-mag 2.5 with TASS MkIV combined V) From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: WDS 17177+3537 mix-up ? Date: Mon, 08 Mar 2010 15:17:41 -0700 I should add here that the Wolf 676 pair is certainly not new, since it has two entries and is flagged as double in the 1961 LTT catalogue. From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Re: WDS 17177+3537 mix-up ? Date: Wed, 10 Mar 2010 13:38:29 -0700 On Wed, 2010-03-10 at 11:05 -0500, Brian D. Mason wrote: > It's interesting that no body has measured both the COU pair and the HO > pair. Given the separation seen in the COU pair and the telescopes used > for most of the HO measures (18-40"), I'd have expected it to have been > measured. That may indicate that they are different pairs, but it is > only an indication. > > We actually matched the HO pair with a different precise position: > > 17 17 55.58 +35 32 49.3 > > and got a measure of 275.5 and 8.01" there. I don't know which is right. > I've made no changes here yet, but would like to hear your opinion. The above coords are for the fast-motion pair Wolf 676, but the sep/pa must apply to something else. I got 4".71 in pa 261.1, as mentioned yesterday, from 2MASS; UCAC3 shows 4".79 in pa 259.4 (an 'all zeros' pair, so presumably just from the UCAC astrograph data alone). There is also SDSS data, but the stars are more-or-less overexposed, so these may not be so great: 4".72 in pa 260.4 epoch 1994.6346 4'.70 in pa 260.2 epoch 2003.4808 ...but consistent with 2MASS. Certainly not 8"; 272, which seems to apply to HD 156712. I examined all the reasonably bright stars within 10' radius on DSS/SDSS/2MASS images, and don't find any other likely suspects matching the Couteau observation, but the relatively large delta-mag might cause it to be masked if it's present for HD 156712. Maybe Couteau got the BD number wrong by one digit or something, so it could be quite distant if the observations don't belong to HD 156712. The new pair I mentioned yesterday (TYC 2600-0501-1 at: 17 17 37.96 +35 32 24.2) also has two SDSS observations: rho theta epoch 4".74 244.1 1994.6346 4".76 245.0 2003.4808 ..reasonably consistent with the 2MASS one sent yesterday. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Types for faint comps in Aql Date: Tue, 09 Mar 2010 00:09:18 -0700 Kuiper gives types for relatively faint companions to both omicron Aql and beta Aql: omi Aql B: M3 beta Aql B: M3 M2 (Adams, Humason, & Joy 1927PASP...39..365A) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 21318+3338 = Kui 124 delta-mag Date: Wed, 10 Mar 2010 15:57:16 -0700 This one is shown with delta-mag = 0.93, but the magnitude for the secondary must be a K-band value or something. Estimating from the 2MASS J-band image, the companion is at least three magnitudes fainter, presumably even larger delta-mag in the visible. Not visible on the POSS-II scans, and maybe a hint of it on the far-red plate. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, thenry@chara.gsu.edu, adric.riedel@gmail.com Subject: WDS 21379+2743 = BD+27 4120 companion Date: Wed, 10 Mar 2010 16:37:56 -0700 Not sure what the relation is to the existing Hipparcos companion, but what's visible on the 2MASS J and K images might be the one observed by McCarthy. Rough estimates from 2MASS images: BD+27 4120: 2".7 in pa 23 --- delta-mag at K is about 2.0, but probably more like 4 or 5 in the visible. The companion star is not present at the location of the 2MASS epoch on the POSS-I plates. --- the Milburn pair is of course optical --- pi = 75 mas, so Todd and Adric get this one, too =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 21400+5407 = Gic 169 estimates Date: Wed, 10 Mar 2010 17:01:40 -0700 This has zero observations in the WDS. On some of the DSS scans and on 2MASS images it seems closer than 2", more like 1"; the position angle is roughly pa 45 (i.e. elongated NE-SW). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 22058+6539 = Ni 44 magnitudes Date: Wed, 10 Mar 2010 20:55:29 -0700 Looks as though the notorious Martin Nicholson adopted magnitudes from the LSPM for this pair. They are erroneous, and result in a reversed position angle. Using the TASS MkIV combined magnitude (V=11.8) and the UCAC3 delta-m, they should be closer to: V = 11.9 + 15.4. The Tycho-2 V mag for the primary is within its errors. The position angle is 136, not 316. Kuiper classified the brighter northwestern component as M1.5. The companion is a fainter M dwarf: the Lepine catalogue implies incorrectly that it is blue, showing V-J = 0.24. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LHS 3892 companion Date: Thu, 11 Mar 2010 13:17:15 -0700 This is a marginal case with just a lump on the 2MASS images. LHS 3892 A = G 67-42 = StKM 2-1686 = 2MASS J23041665+1053497 23 04 16.75 +10 53 49.0 (J2000, LSPM) --- separation 2" in pa 120 (estimate from 2MASS K image) --- V = 11.9 + 16 (?) (published V for primary, rough estimate for secondary); B-V = 1.39, U-B = 1.12 --- spectral type K7 (Kuiper via Bidelman 1985ApJS...59..197B) K4V (Stephenson 1986AJ.....92..139S, but UBV colors are more consistent with Kuiper) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, aawest@bu.edu Subject: Some SDSS M dwarf doubles Date: Mon, 15 Mar 2010 15:35:38 -0700 I am looking now at Andrew West's big list of faint M dwarfs from SDSS (2008AJ....135..785W, with 40,000+ spectral types in VizieR file j/aj/135/785). Andrew and students were observing here last week, and actually got some data despite what we're hoping is the last of our snowstorms. As part of rejiggering the list for my comprehensive file, I noticed a number of double entries (presumably from two observations of the same star), and also some likely binaries. The former have identical coords in the VizieR file, whereas the pairs are slightly different. I have been taking straight averages of the types (if different) for the twice-observed stars. They're usually only one step apart, so I show them as Houk-style 'slash' types, e.g. M3/4. These stars also give a good idea of the scatter in the radial velocities, which is about 5 km/s, as claimed, for the brighter stars, but some tens of km/s down below r' of 18.5 or so. Thus they can't be relied upon to distinguish physical and optical pairs. Here are the double stars noticed up to 2h RA, i.e. among the first 10,000 or so entries. Andrew mentioned that a colleague/student has a list of ~1500 pairs from this work, so probably these have been noticed already. As Brian Mason knows, my concern is specifying which star a spectral type belongs to, and the finding of the doubles, while kinda fun, is a secondary concern. If the coordinates I show below are slightly different from the DR5 "name" positions, it is because they're from DR7 via VizieR, with the idea that in principle they are the preferred ones and have the proper motion applied to J2000, which the West et al positions do not (usually << 1" difference). Likewise the photometry, where I also make the naive assumption of V = g+r/2. Nearly all these are consistent with being physical pairs; the optical suspects are noted. A few are bright enough and far enough apart to appear in 2MASS, DENIS, USNO-B1.0 and/or GSC-2.3. So there is some additional astrometry at earlier epochs, which I quote in one instance. SDSS J001553.50-002348.6 0 15 53.50 -00 23 48.5 (J2000, SDSS DR7) SDSS J001553.60-002344.2 --- separation 4".63 in pa 199.7, epoch 2002.6785 --- V = 17.1 + 19.0 (SDSS DR7 g+r/2) --- spectral types M1 + M2 (2008AJ....135..785W) SDSS J001711.10+002200.5 0 17 11.09 +00 22 00.5 SDSS J001711.51+002204.7 --- separation 7".48 in pa 56.1, epoch 2001.7887 --- V = 17.9 + 18.1 --- spectral types M1 + M2 SDSS J001849.08+001632.1 0 18 49.08 +00 16 32.1 SDSS J001849.42+001627.5 --- separation 6".87 in pa 132.5, epoch 2001.7887 --- V = 19.3 + 20.9 --- spectral types M2 + M4 SDSS J001924.77-003332.8 0 19 24.77 -00 33 32.8 SDSS J001924.33-003331.6 --- separation 6".74 in pa 280.0, epoch 2001.7887 6".66 in pa 280.0, epoch 1987.642 (GSC-2.3) --- V = 16.6 + 17.5 --- spectral types M0 + M1 SDSS J002008.23+011014.2 0 20 08.23 +01 10 14.2 SDSS J002008.12+011012.3 --- separation 2".55 in pa 218.5, epoch 2001.7887 --- V = 16.6 + 19.0 --- spectral types M0 + M3 SDSS J002116.27-000625.2 0 21 16.27 -00 06 25.2 SDSS J002116.24-000620.8 --- separation 4".41 in pa 353.7, epoch 2001.7887 --- V = 18.4 + 21.0 --- spectral types M0 + M4 SDSS J002415.07+002053.5 0 24 15.07 +00 20 53.5 SDSS J002414.96+002056.8 --- separation 3".69 in pa 332.6, epoch 2001.7887 ...some rotation evident between POSS-I and recent images suggests this is possibly an optical pair --- V = 17.2 + 18.2 --- spectral types M1 + M2 ...already known: SDSS J002610.23+002741.7 = Grv 974 A SDSS J002609.79+002727.4 = Grv 974 B --- separation 15".78 in pa 204.6, epoch 2002.6785 --- V = 17.6 + 18.6 --- spectral types M1 + M2/3 --- good common-motion pair per John Greaves SDSS J003548.95+005956.4 0 35 48.95 +00 59 56.2 SDSS J003549.04+005957.0 --- separation 1".50 in pa 57.5, epoch 2002.6785 --- V = 17.3 + 17.7 --- spectral types M0 + M0 --- certainly common motion per POSS-I/modern image motion SDSS J003557.75+001903.8 0 35 57.75 +00 19 03.8 SDSS J003557.57+001902.5 --- separation 2".99 in pa 57.8, epoch 2001.7887 --- V = 17.8 + 19.6 --- spectral types M4 + M4 --- significant common proper motion SDSS J004014.23-000906.7 0 40 14.22 -00 09 06.7 SDSS J004014.26-000905.4 --- separation 1".38 in pa 21.0, epoch 2001.7887 --- V = 17.3 + 20. (estimate for fainter comp: SDSS photometry contaminated) --- spectral type M1 (primary only; West et al have three entries here, all assigned type M1, but the fainter star was obviously not observed) --- small but noticeable common motion between POSS-I and modern images SDSS J004558.45-002939.2 0 45 58.45 -00 29 39.2 SDSS J004558.96-002936.1 --- separation 8".18 in pa 67.3, epoch 2001.7887 --- V = 18.7 + 20.2 --- spectral types M3 + M4 SDSS J004559.63+001835.4 0 45 59.63 +00 18 35.4 SDSS J004559.02+001843.8 --- separation 12".41 in pa 312.5, epoch 2001.7887 --- V = 19.2 + 19.9 --- spectral types M3 + M4 --- common proper motion per SDSS DR7 SDSS J004830.43-005943.7 0 48 30.43 -00 59 43.4 SDSS J004830.52-005943.9 --- separation 1".27 in pa 115.3, epoch 2001.7887 --- V = 17.2 + 17.6 --- spectral types M2 + M2, but possibly cross-contaminated; three West et al entries, all assigned type M2 SDSS J005208.42-005134.6 0 52 08.43 -00 51 34.7 SDSS J005208.11-005140.2 --- separation 7".27 in pa 220.4, epoch 2001.7888 --- V = 18.0 + 18.6 --- spectral types M3e + M4e (secondary very much redder, however: it is brighter from the Sloan i band longward) --- common proper motion per SDSS DR7 SDSS J005227.83-005834.8 0 52 27.83 -00 58 34.8 SDSS J005227.76-005832.1 --- separation 2".87 in pa 338.9, epoch 2001.7888 --- V = 18.5 + 19.3 --- spectral types M0 + M2 SDSS J005524.15+003936.0 0 55 24.17 +00 39 35.9 SDSS J005524.32+003936.3 --- separation 2".29 in pa 79.9, epoch 2001.7888 --- V = 18.5 + 18.7 --- spectral types M3/4 + M3; West et al have three entries SDSS J005554.70+004012.7 0 55 54.69 +00 40 12.8 SDSS J005555.05+004019.2 --- separation 8".41 in pa 38.9, epoch 2001.7888 --- V = 19.5 + 19.8 --- spectral types M2 + M4e --- common proper motion per SDSS DR7 SDSS J011010.66-005649.7 1 10 10.66 -00 56 49.7 SDSS J011010.30-005657.1 --- separation 9".16 in pa 216.5, 2001.8897 --- V = 18.3 + 20.3 --- spectral types M1 + M3 --- probably optical pair SDSS J014526.19+000404.6 1 45 26.23 +00 04 04.5 --- somewhat inscrutable: at least one star here in a trio (east side), but could be either a double star superposed on a galaxy, or a galaxy pair with a single star superposed SDSS J014714.42-005132.7 1 47 14.42 -00 51 32.7 SDSS J014714.72-005131.6 --- separation 4".62 in pa 76.2, epoch 2001.8898 --- V = 19.1 + 21.2 --- spectral types M1 + M4 SDSS J015332.87-001238.1 1 53 32.87 -00 12 38.1 --- close pair assigned the same SDSS designation --- separation 0".7 in pa 220 (estimates from r,i,z frames via SkyView) --- V = 18.8 + 18.8 (assumes delta-mag = 0) --- spectral type M1/2 (two West et al entries) --- 2MASS J-K = 1.11, DENIS J-K = 1.05 --- implies either some IR excess or these are giants at ~50kpc! =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: aawest@bu.edu Subject: SDSS M dwarf doubles, batch 2 Date: Wed, 17 Mar 2010 00:10:06 -0700 SDSS M dwarf doubles, batch 2 SDSS J005950.83-010107.7 0 59 50.81 -01 01 07.8 SDSS J005950.70-010118.7 --- separation 11".12 in pa 189.8, epoch 2001.8897 --- V = 16.1 + 20.7 --- spectral type (M:) + M5 (primary not in West file, but color/magnitude consistent with early-M dwarf) --- large common proper motion; motion of the primary noted in Gould SDSS+USNO-B motion catalogue, and secondary noted in by Deacon (2007A&A...468..163D), but apparently not the two together SDSS J020118.08+003954.3 2 01 18.08 +00 39 54.3 SDSS J020118.13+003954.2 --- separation 1".07 in pa 84.2, epoch 2001.8898 --- V = 19.6 + 19.9 --- spectral types M3 + M4 SDSS J021931.82-004533.0 2 19 31.819 -00 45 33.0 SDSS J021931.79-004534.3 --- separation 1".46 in pa 196.9, epoch 2002.6787 --- V = 19.5 + 20.5 --- spectral type M2/3 (two West et al spectra, probably for primary only) SDSS J022342.60-003329.9 2 23 42.592 -00 33 30.0 SDSS J022342.57-003331.2 --- separation 1".45 in pa 197.5, epoch 2001.8899 --- V = 17.5 + 18.7 --- spectral types M0 + M0 SDSS J025100.55+004649.8 2 51 00.55 +00 46 49.9 SDSS J025100.43+004647.6 --- separation 2".84 in pa 219.1, epoch 2001.8899 --- V = 19.3 + 20.4 --- spectral types M1 + M2 SDSS J030628.44-001737.4 3 06 28.46 -00 17 37.3 SDSS J030628.57-001737.1 --- separation 2".01 in pa 87.1, epoch 1995.1220 2".00 in pa 85.1, epoch 2002.6788 ...presumably purely observational scatter --- V = 19.0 + 19.1 --- spectral types M3/4 + M4 (West et al has two obs for primary) SDSS J030725.95-003955.0 3 07 25.95 -00 39 55.0 SDSS J030726.02-003954.6 --- separation 1".33 in pa 71.4, epoch 1995.1220 1".18 in pa 66.9, epoch 2002.6788 ...presumably purely observational scatter --- V = 18.0 + 20.0 (the two sets of photometry rather scattered) --- spectral types M1 + M2 SDSS J033134.75+010651.9 3 31 34.75 +01 06 51.8 SDSS J033134.86+010651.8 --- separation 1".71 in pa 89.0, epoch 2001.8900 --- V = 18.4 + 19.3 --- spectral types M2 + M2 (three West et al spectra, but all could be for combined light) SDSS J033542.10+005038.9 3 35 42.11 +00 50 38.9 SDSS J033542.27+005037.4 --- separation 2".87 in pa 121.1, epoch 2002.6789 --- V = 15.7 + 18.9 --- G/K + M0 (estimate for primary, West et al for secondary, 2 obs) SDSS J034054.95-004258.5 3 40 54.95 -00 42 58.5 SDSS J034055.03-004259.1 --- separation 1".59 in pa 121.5, epoch 2002.6789 --- V = 17.5 + 17.7 --- spectral types M0 + M2 --- West et al radial velocities: 1.8 and 4.4 km/sec SDSS J034612.94-001238.6 3 46 12.94 -00 12 38.7 SDSS J034612.92-001239.5 --- separation 0".90 in pa 202.9, epoch 2002.6789 --- V = 18.4 + 20.5 --- spectral type M2, two consistent West et al spectra, almost certainly for combined type =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: aawest@bu.edu Subject: SDSS M dwarf doubles, batch 3 Date: Fri, 19 Mar 2010 00:01:09 -0700 This batch goes up to 12h RA in the West et al M dwarfs file. The stars with two entries are nearly absent now, so evidently the main SDSS survey coverage was reduced in a somewhat different way than the (mostly) equatorial strip across the south galactic cap. The present stars are mostly fairly close, rather than the wider pairs where the common motion is evident. SDSS M dwarf doubles, batch 3 SDSS J073957.24+220230.9 7 39 57.24 +22 02 30.8 SDSS J073957.18+220229.5 --- separation 1".53 in pa 214.0, epoch 2002.5 (mean of two obs in 2002) --- V = 17.9 + 18.0 (mean of two rather scattered meas) --- spectral types M1 + M1 (possibly contaminated?) --- West et al rv = -25.7 and -28.0 km/s, implying a physical pair or contam SDSS J074503.36+192117.0 7 45 03.32 +19 21 16.6 SDSS J074503.40+192117.2 --- separation 1".31 in pa 65.0, epoch 2003.076 (two obs) --- V = 18.5 + 19.2 (mean of two rather scattered meas) --- spectral types M3 + M3 (possibly contaminated?) --- West et al rv = +19.2 and +18.0 km/s, implying a physical pair or contam SDSS J090038.56+390326.8 9 00 38.57 +39 03 26.8 SDSS J090038.45+390326.2 --- separation 1".35 in pa 246.6, epoch 2001.9694 --- V = 18.6 + 20.2 --- spectral type M1 (probably for primary only) SDSS J101337.58+511616.5 10 13 37.58 +51 16 16.4 SDSS J101337.45+511615.6 --- separation 1".35 in pa 235.8, epoch 2002.2480 --- V = 18.4 + 19.3 --- spectral type M0 (two West et al spectra, primary only) SDSS J102157.94+544203.3 10 21 57.95 +54 42 03.3 SDSS J102157.79+544204.5 --- separation 1".75 in pa 311.9, epoch 2002.0241 --- V = 17.8 + 18.1 --- spectral types M3e + M3 SDSS J104712.25+475613.8 10 47 12.26 +47 56 13.6 --- single SDSS entry --- separation 0".7 in pa 38/218, epoch 2002.1063 (mean of estimates from SDSS r,i,z images via SkyView) --- V = 17.6 + 17.6 (SDSS r' = 16.14 is consistent with CMC14 r' = 15.9 +/- 0.3, so applies to combined light; 0.75 then added to derived V from the SDSS g+r/2) --- spectral type M2 (two West et al spectra, certainly for combined light) SDSS J113833.05+535629.6 11 38 33.05 +53 56 29.7 SDSS J113833.12+535630.4 --- separation 1".07 in pa 38.5, epoch 2001.9641 --- V = 17.6 + 17.7 --- spectral type M0 (two West et al spectra probably for combined light) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: aawest@bu.edu, jam@nofs.navy.mil Subject: Re: SDSS M dwarf doubles, batch 4 Date: Sun, 21 Mar 2010 19:47:39 -0700 Okay, this is the last batch of the obvious pairs from the 2008 M dwarfs list. This little project was an exercise in seeing how to prepare a big list for my comprehensive spectral types catalogue while still trying to "look at every star". The very high overall quality and consistency of the SDSS data meant this was more-or-less straightforward. The main thing I did was to scan through to look for double entries for the same star. There were about 120 of these, nearly all in the equatorial stripe across the south galactic cap. I also tried to identify the obvious pairs. Sometimes this was complicated by the fact that sometimes the SDSS selection included only the faint component of a pair, a few of which I noticed along the way. The brighter star is usually some sort of K dwarf. However, I discovered over the weekend that there remain a few thousand more pairs! It turns out that nearly all the moderately bright stars with r' < 19.5 or so (and some fainter), _and_ which are shown in the table without proper motions are close pairs (0".5 - 2"), similar to some that I've been sending. The majority have small/modest delta-magnitudes, so the 3" fibers in the SDSS spectrograph plates take in all the light from the pairs. That these stars are near-equal doubles was not accounted for in the derived distances shown by West et al, so evidently they didn't know about them at the time (which Andrew confirms). I'm not sure what to do about them. They appear as single entries in both West et al paper and in the SDSS DR7 catalogue. So in order for them to be useful, they have to be measured somehow. Those I've sent (such as in the present list) have been done manually simply by measuring large-scale cut-outs of the SDSS images using SkyView. Smart people could probably do something better. Among other things I learned: the quality of the Munn et al proper motions quoted by West et al decline steadily starting somewhere around r' = 19.5, and by 20.5 essentially all the "large" motion stars in fact have negligible motion (at least the ones visible on the POSS-I red plate-scans, which sometimes go as faint as r' ~21 for the plates taken in good seeing). Often you can see both the non-moving star at the threshold of the POSS-I image, and the "lump" that was matched to get the large motion. This will really influence the statistical distribution of the inferred kinematics! The few brighter stars without motions that are not double are superposed on small, faint galaxies or are in the halos of big ones. Of those that show H-alpha emission, there was a check to see that the velocity of the H-alpha was the same as the star, right? The typical faint galaxy would have a redshift of at least 0.1, so presumably this would be obvious. SDSS M dwarf doubles, batch 4 SDSS J131959.56+405039.7 13 19 59.56 +40 50 39.7 --- separation 1".55 in pa 95.6, epoch 2003.3134 (mean of estimates from SDSS r,i,z images via SkyView) --- V = 18.9 + 20.9 (estimated delta-mag 2.0 and SDSS g+r/2 assumed to be combined magnitude) --- spectral type M2 (primary only) SDSS J132011.33+022114.1 13 20 11.31 +02 21 14.6 --- separation 1".1 in pa 150, epoch 2000.3404 (mean of estimates from SDSS r,i,z images via SkyView) --- V = 17.8 + 18.1 (estimated delta-mag 0.3 and SDSS g+r/2 assumed to be combined magnitude; SDSS r' = 16.49, CMC14 r' = 16.41 +/- 0.08) --- spectral type M2 (probably combined light) SDSS J132013.53+611757.7 13 20 13.53 +61 17 57.6 --- separation 0".7 in pa 135, epoch 2001.3914 (mean of estimates from SDSS r,i,z images via SkyView) --- V = 18.9 + 19.4 (estimated delta-mag 0.5 and SDSS g+r/2 assumed to be combined magnitude) --- spectral type M4e (probably combined light) SDSS J132024.06+041325.4 13 20 24.05 +04 13 25.5 --- separation 1".1 in pa 304.6, epoch 2001.2138 (mean of estimates from SDSS r,i,z images via SkyView) --- V = 16.8 + 18.3 (estimated delta-mag 1.5 and SDSS g+r/2 assumed to be combined magnitude) --- spectral type M3 (primary only) SDSS J132230.10+150356.6 13 22 30.15 +15 03 56.6 --- separation 1".0 in pa 334, epoch 2003.4092 --- V = 17.8 + 18.8 (estimated delta-mag 1.0 and SDSS g+r/2 assumed to be combined magnitude) --- spectral type M4 (primary only) SDSS J133837.68+553226.2 13 38 37.68 +55 32 26.3 --- separation 0".8 in pa 18, 2003.1880 (estimate from SDSS z image) --- V = 21.5 + 22.5 (estimated delta-mag 1.0 and SDSS g+r/2 assumed to be combined magnitude) --- spectral type M6 (combined light?) SDSS J134802.86+485351.0 13 48 02.87 +48 53 51.0 SDSS J134803.03+485348.9 --- separation 2".59 in pa 141.4, epoch 2003.0870 --- V = 16.2 + 18.9 (SDSS g+r/2) --- spectral types K: + M2 (estimate for primary from J-K color, West et al for secondary) SDSS J141845.92+591554.8 14 18 45.92 +59 15 54.8 SDSS J141845.97+591555.7 --- separation 1".04 in pa 23.1, epoch 2001.3914 --- V = 17.5 + 18.6 --- spectral types M2 + M1 (yes the brighter one has the later type) SDSS J162027.55+364002.8 16 20 27.64 +36 40 03.0 SDSS J162027.66+364003.1 --- separation 1".50 in pa 83.4, epoch 2002.76 (mean of two) --- V = 18.5 + 18.5 (estimates based on delta-m = 0, and CMC14 combined r' = 16.9 and GSC-2.3 V = 17.7) --- spectral types M3e + M4e SDSS J170006.54+342525.8 17 00 06.55 +34 25 25.8 --- separation 1".15 in pa 244.9, epoch 2001.3949 --- V = 18.5 + 18.8 ("selected" SDSS g+r/2 from four detections to conform reasonably with combined r' = 17.3 from CMC14) --- spectral type M2/3 (two West et al spectra certainly for combined light) SDSS J210105.37-065633.0 21 01 05.37 -06 56 32.8 (J2000, 2MASS) SDSS J210105.44-065639.1 --- separation 6".13 in pa 170.9, epoch 2000.6741 --- V = 18.3 + 20.5 --- spectral types K: + M4 (estimate from J-K for primary, West et al for secondary) --- common motion evident from POSS-I/new image comparison; due to incorrect linkages, the primary is "new" large motion star SDSS J211945.79+002533.4 21 19 45.79 +00 25 33.5 SDSS J211946.84+002530.9 --- separation 15".81 in pa 99.0, epoch 2001.7201 (evidently the more reliable of two detections) 15".82 in pa 99.1, epoch 2000.7 (2MASS) 15".86 in pa 98.9, epoch 1991.538 (GSC-2.3) 15".92 in pa 98.2, epoch 1952.645 (USNO-A2.0) --- V = 17.6 + 18.3 --- spectral types M1 + M1, rv = -120.8, -122.2 SDSS J213213.34-000604.4 21 32 13.34 -00 06 04.3 SDSS J213215.02-000614.0 --- separation 27".08 in pa 111.0, epoch 2001.7884 27".19 in pa 111.0, epoch 1954.507 (POSS-I via APM-Cambridge) --- V = 18.0 + 20.6 --- spectral types M0 + M4, rv = 0.0, -16.6 SDSS J233116.08+145305.3 23 31 16.09 +14 53 05.7 SDSS J233116.13+145306.0 --- separation 0".7 in pa 41, epoch 2001.7146 (mean of estimates from SDSS r,i,z images via SkyView) --- V = 19.0 + 19.3 (assumes delta-m = 0.3 and SDSS g+r/2 is for combined light; SDSS DR7 r' = 17.64, CMC14 r' = 17.62) --- spectral type M3 (two West et al spectra, certainly for combined light) SDSS J234459.81+002750.2 23 44 59.80 +00 27 50.0 SDSS J234459.62+002750.0 --- separation 2".75 in pa 89.8, epoch 2002.6784 --- V = 18.9 + 19.1 --- spectral types M3 + M4e, rv = -20.7, -18.9 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: aawest@bu.edu, jam@nofs.navy.mil Subject: Re: SDSS M dwarf doubles, batch 5 (!) Date: Sun, 21 Mar 2010 22:17:27 -0700 To get a feeling for things, I went through the first 10m of RA for the West et al 2008 list, hunting specifically for doubles. Thirteen more systems were found (of 461 total entries ---> 2.8%, suggesting ~1250 pairs for the whole list), shown in the attached list, which is in a wider tabular format than previously. This results from examination of all the "blank motion" stars and those shown with 0,0 motion down to about r' mag 20.5. There is one trio, and one WD/MD pair. Most of this group have two entries in the SDSS photometric catalogue, even down close to an arcsecond, so most of the results are from that astrometry. For the single-entry pairs, the separation is given to 0".1 and the position angle to 1 deg from my estimates on SDSS images via SkyView. The delta-mags thus are also my estimates, but making use of the combined-light SDSS photometry. Name RA (J2000) Dec VA VB rho theta epoch spectral types SDSS J000204.85+145352.5 0 02 04.86 +14 53 52.6 18.6 19.6 0.7 73 2000.7401 M1 (combined light) SDSS J000228.66+000235.8 0 02 28.66 +00 02 35.9 18.3 20.7 1.43 208.0 2002.6785 K: + M0 SDSS J000228.61+000234.6 SDSS J000228.61+000231.8 AC: 18.3 22.8 4.07 189.3 2002.6785 SDSS J000327.34-005752.6 0 03 27.34 -00 57 52.7 19.0 20.0 4.88 146.0 2001.7887 M: + M3 SDSS J000327.52-005756.7 SDSS J000352.75+160334.1 0 03 52.75 +16 03 34.2 18.5 19.0 0.8 247 2000.7401 M3 (combined light) SDSS J000429.91-004451.6 0 04 29.93 -00 44 51.5 19.5 20.6 2.57 12.1 2002.6785 K: + M3 SDSS J000429.96-004449.1 SDSS J000451.21-010423.2 0 04 51.21 -01 04 23.2 18.7 19.0 2.67 331.2 2002.6785 M2 (primary only?) SDSS J000451.12-010420.8 SDSS J000612.47+154649.8 0 06 12.47 +15 46 49.8 18.0 18.6 1.14 256.8 2000.7401 M4 (combined light) SDSS J000612.39+154649.5 SDSS J000632.74-001753.3 0 06 32.74 -00 17 53.4 17.3 18.0 1.28 334.5 2002.6785 M3 (combined light) SDSS J000632.70-001752.1 SDSS J000747.97-002243.1 0 07 47.97 -00 22 43.1 18.6 19.6 2.52 347.9 2002.6785 M: + M2 SDSS J000747.93-002240.6 SDSS J000755.52+144327.6 0 07 55.52 +14 43 27.6 18.5 18.7 1.84 131.5 2001.7147 WD: + M0 SDSS J000755.61+144326.4 SDSS J000823.15+141921.1 0 08 23.16 +14 19 21.1 17.5 18.2 1.31 310.1 2001.7147 M3 (combined light) SDSS J000823.08+141921.9 SDSS J000823.22-005629.5 0 08 23.22 -00 56 29.5 20.5 21.3 3.63 37.3 2001.7887 M3 (primary only) SDSS J000823.37-005626.6 SDSS J000949.71-004133.1 0 09 49.71 -00 41 33.1 18.7 20.0 4.68 336.4 2002.6785 K: + M3 SDSS J000949.59-004128.8 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Note on WDS 10473+8638 = VVO 7 Date: Thu, 25 Mar 2010 19:08:23 -0700 Weis gives photometry for each component: V = 10.37 + 13.99 (1993AJ....105.1962W). The brighter star is variously classified as a dwarf or a giant. The UBVRI colors are somewhat equivocal, and while the ROSAT detection suggests an active dwarf, the small motion and (admittedly marginal) IRAS detection argue in favor of giant. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09002+1550 = Ald 115 coords Date: Thu, 25 Mar 2010 23:07:14 -0700 This guy is about an arcminute off: WDS 09002+1550 = BD+16 1877 = UCAC2 37360429 9 00 12.88 +15 49 30.8 (J2000, UCAC2) --- combined V = 10.33 +/- 0.04 (ASAS-3) 10.38 +/- 0.10 (TASS MkIV) 10.43 +/- 0.04 (Bordeaux meridian circle) ...all suggest the component magnitudes need to be adjusted fainter about a full magnitude. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD-08 535 cpm companion Date: Fri, 26 Mar 2010 14:49:19 -0700 I'm working through the Vyssotsky K/M dwarfs these days, and really trying not to look for pairs. This one was fairly obvious, however. BD-08 535 A = TYC 5286-0068-1 = 3UC 164-007600 2 51 44.45 -08 16 09.6 (J2000, UCAC3) FBS 0249-084 (B) = 3UC 164-007603 = 2MASS J02514820-0813422 = SDSS J025148.21-081342.3 2 51 48.22 -08 13 42.4 (J2000, SDSS DR7) --- separation 157".48 in pa 20.8, epoch 2000.0 (UCAC3/SDSS) --- V = 9.9 + 14.8 (published V for primary, SDSS g+r/2 for secondary) --- spectral types K4V + M5/6 (1986AJ.....92..139S for primary, 1998Ap.....41..356G for secondary) --- proper motions: A: +29.7 -13.3 UCAC3 B: +28 -10 USNO-B1.0 +34 -14 SDSS DR7 +34.5 -12.1 Gould, 2004ApJS..152..103G =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-50 9557 is double Date: Sat, 27 Mar 2010 14:19:36 -0700 This is a near-equal pair that appears in the AC and in the Cape 'faint' catalogue. Seems like this one would have been in the TDSC, too, but not there. Both stars have double-star flag '6' in UCAC3. CD-50 9557a = CPD-50 8197a = TYC 8307-0915-1 = 3UC 079-252195 15 33 41.12 -50 50 15.3 (J2000, Tycho-2) --- NW component assumed as 'A' simply because it is the Tycho star --- separation 5".9 in pa 74 , epoch 1903.506 (AC2000.2) 5".9 in pa 75 , epoch 1933.51 (Cape Faint) 5".66 in pa 77.6, epoch 2000.0 (UCAC3) 5".59 in pa 77.0, epoch 2000.4 (2MASS) --- V = 11.7 + 11.7 (delta-mag = 0 and ASAS-3 combined V = 10.95) --- spectral type A0 (Cannon via Cape faint catalogue) B8/A0 (1992JRASC..86..248R) --- essentially identical 2MASS magnitudes and colors =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-49 9556 is double Date: Sat, 27 Mar 2010 14:38:50 -0700 Another star identified from 1992JRASC..86..248R. This is a UCAC3 double, though the proper motions are likely wrong. Curiously, UCAC3 has the visually-brighter NW component shown fainter and as having 'radial' proper motion. The 2MASS color is for an unreddened K star, contradicting the objective-prism type. This component is very much the brighter one in 2MASS images. So either the SE component is the A0 star, or the NW component is itself a close K+A type binary. CD-49 9556a = CPD-49 8006a = TYC 8302-0177-1 = 3UC 080-230730 15 22 05.90 -50 26 42.9 (J2000, UCAC3) --- separation 3".19 in pa 152.0, epoch 2000.0 (UCAC3, could be in error due to spurious proper motion) --- V = 11.5 + 11.8 (assumes UCAC3 delta-mag and ASAS-3 combined V = 10.88); delta-mag in 2MASS J ~1.5 - 2) --- spectral type B8/A0 (1992JRASC..86..248R for combined light?) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 15452-3819 = LDS 539 comment Date: Sat, 27 Mar 2010 15:44:11 -0700 The secondary of this pair is a close WD+MD binary. For example, Silvestri et al 2005AJ....129.2428S give the types as DA + M3V. The primary is also a pair, but looking at the various DSS/2MASS images, I suspect it is an optical pair. The primary of the pair is superposed on the companion in the DSS1 blue plate, but separated in more recent images. An estimate from the 2MASS J image is: 2".7 in pa 332. From the same image I estimate coordinates 15 45 11.67 -38 18 46.9 for the secondary star, whereas USNO-A2.0 gives 15 45 11.70 -38 18 47.6 for the primary at epoch 1981.4. They are merged still on an overlapping pair of Whiteoak extension plates from 1964 and 1965, though the seeing of course is not great on these. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+73 186 cpm companion Date: Sat, 27 Mar 2010 19:43:30 -0700 This Vysstosky K/M dwarf has a co-moving companion. The various astrometric catalogues are a bit muddled, but from simple measurement on DSS/2MASS images, both stars move nearly due south about 3" between POSS-I and recent stuff. The PPMX catalogue has them nearly correct, and NOMAD has more-or-less the right idea. BD+73 186 = TYC 4338-0547-1 = 2MASS J03341233+7334311 = MCC 420 3 34 12.34 +73 34 31.1 (J2000, Tycho-2) --- separation 12".76 in pa 100.4, epoch 1999.1 (2MASS astrom) 12".60 in pa 99.8, epoch 1983.850 (GSC v1.2/GSC-ACT) --- V = 10.3 + 14.7, assumes Tycho-2 adjusted V for primary, and UCAC3 delta-mag --- spectral type K8V (1956AJ.....61..201V, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06496+3508 magnitudes Date: Sat, 27 Mar 2010 23:13:33 -0700 Looks as though you have the J-band magnitudes for this pair. Adjusting the UCAC3 magnitudes to V, better values are: V = 10.2 + 16.0. The primary is BD+35 1493 = G 87-9 = MCC 480. Mermilliod shows V = 10.18, B-V = 1.33, U-B = 1.27 for this star. Spectral types include K5V (1986AJ.....92..139S), and K6V 2003AJ....126.2048G, consistent with the quoted Kirkpatrick data. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 07271+2410 = Pou 2785 coords etc Date: Sat, 27 Mar 2010 23:54:40 -0700 At present the WDS assigns this pair to the large-proper-motion star Ross 877 = MCC 496. However, the pair is located somewhat to the north and not related to the motion star. WDS 07271+2410 = Pou 2785 A = 2MASS J07270390+2410041 = 3UC 229-088612 7 27 03.90 +24 10 04.2 (J2000, 2MASS) --- separation 7".39 in pa 357.5, epoch 2000.2 (2MASS) 7".31 in pa 357.5, epoch 2002.0 (CMC14) 7".37 in pa 357.9, epoch unknown (UCAC3) --- combined V = 12.69 +/- 0.10 (ASAS-3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: One less HDS pair Date: Sun, 28 Mar 2010 00:01:41 -0700 HDS 1065, nominally involved with the large motion pair Wor 27, is not visible on any of the DSS, 2MASS, or SDSS images. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, thenry@chara.gsu.edu, adric.riedel@gmail.com Subject: BD-08 2582 cpm companion Date: Sun, 28 Mar 2010 13:03:49 -0700 This one is marginally visible on various DSS images, but pops out nicely in 2MASS images. J-K color consistent with it being an M dwarf companion. Hip2 parallax = 68.7 mas. BD-08 2582 A = IRAS F09042-0836 = 1RSX J090646.1-084827 9 06 45.35 -08 48 24.6 (J2000, UCAC2) BD-08 2582 B = 2MASS J09064536-0848248 --- separation 8".23 in pa 263.9, epoch 1999.017 (2MASS) 8".04 in pa 264.7, epoch 1998.413 (DENIS) --- V = 9.5 + 14.5? (published V for primary, estimated delta-m = 5 for secondary; delta-J = 3.9) --- spectral type K7V (1986AJ.....92..139S, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+38 2037 faint companion Date: Sun, 28 Mar 2010 13:44:47 -0700 Here's a very faint companion that shows up only on the SDSS z' and 2MASS images. BD+38 2037 A = 3UC 257-100862 = 2MASS J09285709+3803576 9 28 57.11 +38 03 57.6 (J2000, UCAC3) BD+38 2037 B = SDSS J092856.77+380355.4 --- separation 4".79 in pa 244.1, epoch 2002.9498 (SDSS DR7, nominal separation, but primary is toasted so offset may not be reliable) --- separation 4".5 in pa 247, epoch 1998.25 (eyeball estimate from 2MASS K image via SkyView) --- V = 10.5 + 19? (published V for primary, very rough estimate for secondary assuming SDSS z mag is slightly bright and using approx g-z colors for similar stars from the West et al M dwarfs) --- spectral type K5V (1986AJ.....92..139S, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 82939 cpm companion Date: Sun, 28 Mar 2010 14:10:15 -0700 It seems not to have been noticed that the Vyssotsky star MCC 549 has common motion with HD 82939 about 2'.7 away. There are Hipparcos parallaxes for both stars (26 and 30 mas, resp) HD 82939 A = TYC 2992-0290-1 = 3UC 256-098479 9 36 04.28 +37 33 10.4 (J2000, UCAC3) HD 82939 B = MCC 549 = AC+38 28746 = 2MASS J09361593+3731456 --- separation 162".33 in pa 121.5, epoch 2000.0 (UCAC3, which includes Hip, Tyc2, and intermediate catalogues) --- V = 8.3 + 11.0 (published V for both stars) --- spectral types G5(V) + K5V (HD type for primary consistent with uvby colors as dwarf, 1986AJ.....92..139S for secondary) --- a very faint West et al M dwarf in the same field is not related =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11037+3253 = hj 493 third component Date: Sun, 28 Mar 2010 16:03:40 -0700 The brighter AB pair here are well-observed. There is a bright star about 37" NW that is unrelated. However, the DSS/SDSS/2MASS images show a third fainter star closer to A that becomes gradually brighter at longer wavelengths, and so is a likely M dwarf companion. WDS 11037+3253 A = BD+33 2071 WDS 11037+3253 C = 2MASS J11034133+3253166 = SDSS J110341.34+325316.7 --- separation 5".19 in pa 68.8, epoch 1998.219 (2MASS) 5".17 in pa 71.5, epoch 2004.2826 (SDSS DR7; primary saturated, so astrometry maybe not be reliable) --- V = 10.6 + 15? (published V for primary, estimate for secondary) --- spectral type K4V (1986AJ.....92..139S for primary, not in WDS) --- Ed Weis notes this as 'BC' in 1993AJ....105.1962W (entry for MCC 597), with the estimate of 4" in pa 60, delta-R mag 2 or 3. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SDSS J113002.09+542907.0 is double Date: Sun, 28 Mar 2010 19:02:13 -0700 Another of the thousands, which happened to be in the field of an unrelated Vyssotsky star. SDSS J113002.09+542907.0 = 2MASS J11300214+5429068 11 30 02.10 +54 29 07.0 (J2000, SDSS DR7) SDSS J113002.29+542906.4 --- separation 1".85 in pa 108.4, epoch 2002.2482 (SDSS DR7) --- V = 18.2 + 18.5 (SDSS g+r/2) --- spectral type M3e (2008AJ....135..785W, prob primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: MCC 625 cpm(?) companion Date: Sun, 28 Mar 2010 20:14:39 -0700 This star, whose motion falls below the limits of the classical catalogues, has a likely common-motion companion. Plenty bright and well-separated, so I dunno why Lepine didn't pick it up. MCC 625 = TYC 0868-0188-1 = UCAC2 35759071 11 56 20.31 +11 01 44.3 (J2000, UCAC2) --- separation 15".62 in pa 98.8, epoch 1955.281 (USNO-A2.0) 16".22 in pa 101.4, epoch 2000.173 (2MASS) 16".21 in pa 100.8, epoch 2001.277 (CMC14, n=1) 16".26 in pa 100.7, epoch 2002.9445 (SDSS DR7) --- V = 11.0 + 16.9 (published V for primary, SDSS g+r/2 for secondary) --- spectral type K4/5V (1986AJ.....92..139S, primary only) --- taking simple difference of USNO-A2.0 minus 2MASS coordinates for the secondary, I get motion of -160, -30 mas/year, versus -170, -13 from UCAC2 for the primary. the match isn't great, but is at least suggestive. the SuperCOSMOS coords from POSS-I red are rather poor, so they aren't any help. USNO-B1.0 shows an odd small motion for the secondary. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 12032+4751 = Vys 12 coords etc Date: Sun, 28 Mar 2010 20:38:52 -0700 This one is shown in the WDS with coordinates for the wrong star. WDS 12032+4751 = Vys 12 = BD+48 1994 = SDSS J120314.81+475033.3 = 2MASS J12031483+4750332 = UCAC2 47736994 12 03 14.85 +47 50 33.4 (J2000, UCAC2) SDSS J120314.79+475030.6 --- separation 2".73 in pa 182.9, epoch 2003.06 (SDSS DR7, two obs) --- V = 10.0 + 15.8 (published V for primary, SDSS g+r/2 for secondary; Vyssotsky delta-mag too small or caught during flare?) --- spectral type K8V (1956AJ.....61..201V, but colors are for about K4V, typical of systematic error in Vyssotsky's types) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 12505+4021 = LDS 4281 comment Date: Sun, 28 Mar 2010 23:28:55 -0700 Just noticed that this wide pair has separate entries in my spectral types file. Which means there are types for both stars. LDS 4281 A = MCC 677 = StKM 2-880: M0V (1986AJ.....92..139S) LDS 4281 B = SDSS J125041.14+402134.7: M6e (2008AJ....135..785W) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 111996 faint companion Date: Mon, 29 Mar 2010 13:39:27 -0700 This one appears nicely in SDSS and 2MASS images. HD 111996 A = BD+34 2366 = UCAC2 43621815 12 52 48.59 +33 44 15.3 (J2000, UCAC2) SDSS J125248.29+334412.4 --- separation 4".36 in pa 229.5, epoch 2004.2828 (SDSS DR7, primary toasted so may be unreliable) --- V = 9.5 + 15.5? (published V for primary, estimate for secondary since SDSS photometry is problematic) --- spectral types K5V (1966ArA.....3..535L) K4V (1986AJ.....92..139S) ...UBV colors perhaps slightly favor the K4V type =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+38 2445 faint companion Date: Mon, 29 Mar 2010 14:16:34 -0700 This one is fairly close, and so the sep/pa are from estimates off SDSS and 2MASS images. BD+38 2445 A = TYC 3025-0938-1 = UCAC2 45006056 13 25 28.34 +37 43 09.9 (J2000, UCAC2) --- separation 2".9 in pa 98, epoch 2003.3163 (estimates from SDSS images) --- V = 11.1 + 15? (published V for primary, estimate for secondary) --- spectral type K7V (1986AJ.....92..139S, primary only) --- Ed Weis (1993AJ....105.1962W) also noted this as double with estimated separation 3" in pa 90, delta-R ~2 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 13284+3005 modern observations Date: Mon, 29 Mar 2010 14:40:52 -0700 This is shown with only the original 1962 observation. rho theta epoch source LDS 1390: 52.56 51.4 1999.079 2MASS 52.65 51.2 2000.0 USNO-B1.0 52.50 51.4 2004.3896 SDSS DR7 52.22 51.7 1950.427 USNO-A2.0 for primary and APM-Cambridge for secondary (secondary is not in A2.0) 52.22 51.6 1950.427 USNO-A2.0 for primary and SuperCOSMOS POSS-I red for secondary =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 13514+2620 = YSC 50 comment Date: Mon, 29 Mar 2010 15:55:59 -0700 Not sure what's going on here, but I half suspect the companion here is optical. The main reason is that it appears to be visible several arcsec SW of the primary on the POSS-I images at a position within in an arcsec or so of its place on SDSS and 2MASS images. At some point the separation must have been very close. The latter catalogues show: 2MASS: 2".74 in pa 0.6, epoch 2000.277 SDSS : 3".22 in pa 2.4, epoch 2004.4467 Obviously this is much wider than the 2007 YSC observation, so if the close companion really exists, then I wonder if it would be good to add a note about the similarly-bright optical companion (delta-mag ~1 - 1.5). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 14174+4527 astrometric obs Date: Tue, 30 Mar 2010 20:43:25 -0700 Some additional observations from on-line catalogues: source rho theta epoch USNO-A2.0 59.14 204.0 1950.378 GSC-ACT 59.10 203.9 1983.125 CMC14 59.19 203.9 2002.282 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 15079+8545 third component Date: Tue, 30 Mar 2010 22:36:38 -0700 This wide cpm pair has a third star associated with the southwestern (slightly fainter?) component. It is fairly close and shows well only on the 2MASS images, from which I give an estimate. WDS 15079+8545 = VVO 1 BC: 3".5 in pa 240, epoch 1999.293 --- sep/pa estimate from 2MASS J & K images --- V = 11.1 + 15? (published V for comp B, estimate for C) In a really good early survey, Petersson 1927MeUpp..29....1P gave separate types of d:K2: for the A,B stars; Nassau & Seyfert 1946ApJ...103..117N gave a single uncertain type of d:K2:, I'm guessing for the pair. Even though N&S specifically described using MK criteria for their classifications, they didn't use the then-new-fangled Roman numeral notation for luminosity classes. Vyssotsky also gave a combined light type of dK8 (1956AJ.....61..201V) in a paper where the separate proper motions are given as well (the K8 type is consistent with about K5 on the MK scale). His note says 24" separation with delta-mag 0.1. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+14 2955 faint companion Date: Tue, 30 Mar 2010 23:43:24 -0700 This one is visible on the various DSS images and comes up nicely toward longer wavelengths. BD+14 2955 = TYC 0955-0241-1 = 3UC 209-126619 15 54 15.83 +14 16 27.0 (J2000, UCAC3) --- separation 7".84 in pa 280.1, epoch 1998.145 (2MASS astrom) --- V = 9.7 + 17.5? (published V for primary, estimate for secondary from SDSS photometry for similar-looking nearby stars) --- spectral type K5 Vyssotsky from 1951TOYal..23.....B I think; he gives K8V in 1956AJ.....61..201V, which is too late as usual =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+47 2298 companion confirmed Date: Wed, 31 Mar 2010 00:20:39 -0700 This mainly confirms that the faint companion to BD+47 2298, flagged correctly in UCAC3, is real. There's a problematic UCAC3 entry associated with the faint star, but presumably that will get linked at some point. Other observations via VizieR: source rho theta epoch CMC14 11.27 264.3 2002.364 SDSS 11.21 265.3 2001.3752 (bright star saturated etc...) 2MASS 11.35 264.6 1999.348 --- V = 9.9 + 15.3 (published V for primary, SDSS DR7 g+r/2 for secondary) --- spectral type K4V (1986AJ.....92..139S, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+34 2835 cpm companion Date: Wed, 31 Mar 2010 16:04:52 -0700 This is a straightforward one with clear common motion evident from POSS-I versus recent images. BD+34 2835 = TYC 2585-2021-1 = UCAC2 43629455 16 45 32.28 +33 49 48.3 (J2000, UCAC2) --- 8".02 in pa 146.5, epoch 1999.367 (2MASS astrom) --- V = 9.5 + 14? (published V for primary, estimate for secondary) --- spectral type K8V (1956AJ.....61..201V), but UBV colors are B-V = 0.96, U-B = 0.66, roughly K2/3V --- UCAC3 shows both stars, but possibly different non-2000.0 epoch for the secondary =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+37 2795 faint companion Date: Wed, 31 Mar 2010 16:21:23 -0700 There's an awful lot of these things that pop up at longer wavelengths. BD+37 2795 = TYC 2588-2178-1 = 3UC 254-117559 16 45 23.91 +36 51 02.4 (J2000, UCAC3) --- separation 5".87 in pa 12.6, epoch 1998.329 (2MASS astrom) 5."86 in pa 12.2, epoch 2001.908 (SDSS, n=2) --- V = 10.0 + 17.6 (published V for primary, SDSS g+r/2 for secondary) --- spectral type K8V (1956AJ.....61..201V), though colors suggest K4/5V, consistent with Vysstosky's usual offset =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+08 5036 cpm companion Date: Wed, 31 Mar 2010 23:22:18 -0700 Nearing the end of the Vyssotsky stars, here is an overlooked easy cpm companion. BD+08 5036 = TYC 1161-0037-1 = 3UC 200-318712 23 17 32.31 +09 41 36.4 (J2000, UCAC3) --- separation 20".15 in pa 5.8, epoch 1951.604 (USNO-A2.0, no good?) 20".71 in pa 7.3, epoch 2000.665 (CMC14) 20".71 in pa 7.0, epoch 2000.800 (2MASS) --- V = 9.7 + 16.3 (published V for primary, secondary V adjusted to mean delta-mag from CMC14 and UCAC3) --- spectral type K8V (1956AJ.....61..201V) but UBV colors imply ~K5V as usual =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 21078+2945 AB 2MASS obs Date: Thu, 01 Apr 2010 01:18:58 -0700 I notice that the Hip/Tycho-2/TDSC position angle (at least) appears to be in error. The 2MASS observation is closer to the 1931 observation. Mlb 715: 5".18 in pa 38.5, epoch 1998.742 (2MASS) The C component has long since been left behind by proper motion of the AB pair. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 00429+2240 AB spectral type Date: Thu, 01 Apr 2010 17:10:24 -0700 I've now moved onto Sang-Gak Lee's thesis paper, 1984AJ.....89..702L, where she gives new spectral types for several hundred Lowell proper-motion stars. I've come across G 69-14, which is Skf 229 AB. In my note from Feb 25, I suggested a type close to M0 for primary. Her objective-prism type is M1, rated as 'poor'. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 01352+0538 additional astrometry Date: Thu, 01 Apr 2010 20:22:34 -0700 source rho theta epoch CMC14 13.94 209.6 2000.706 2MASS 14.23 209.4 2000.646 ...the CMC14 has n=2, so ought to be okay; the faint star does show rms error of 0".22, however. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 01452+0331 = LDS 3306 is optical Date: Thu, 01 Apr 2010 21:24:00 -0700 The USNO-B1.0 proper motion for the secondary of this pair appears to be correct in showing a slightly slower eastward motion, and that it is moving north, whereas the primary is moving south. For what it's worth, USNO-A2.0 shows 87".74 in pa 153.5 for 1951.684. USNO-B1.0 shows motion of +184, +66 for the faint star, versus UCAC2 +227, -13 and Tycho-2 +224, -12 for the primary (UCAC3 and LSPM copy Tycho-2). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 02480+5611 = Sti 1940 disambiguation Date: Fri, 02 Apr 2010 00:19:31 -0700 This object involves a now-wide optical pair reported by Stein, and a new cpm pair shown by Lepine. Sti 1940 is now at: 30".6 in pa 270.9. For the "new" pair, 2MASS shows: 4".21 in pa 235.8, epoch 1999.780. Lepine shows: 4".10 in pa 236.9, nominally 2000.0 from Tycho-2 minus Superblink for the secondary. 2MASS shows delta-J of 2.6, but it's more like 4 in the visible, so something like V = 15.5 for 'C'. Lee 1984AJ.....89..702L gives spectral type K5 for the primary. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 95-19 is double Date: Fri, 02 Apr 2010 13:41:45 -0700 Readily visible but not well resolved on various images except SDSS u, from which estimates are shown below. G 95-19 = UCAC2 45774190 = SDSS J031527.51+402844.1 = 2MASS J03152749+4028458 3 15 27.49 +40 28 45.6 (J2000, UCAC2) --- separation 1".7 in pa 36, epoch 1994.1723 (SDSS DR7) --- V = 12.0 + 12.5 (from combined V = 11.5 [CMC11, TASS MkIV] and estimated delta-mag = 0.5 --- it's about 1.2-1.5 on the Sloan u, near-equal on Sloan z, something like 0.5 on Sloan g with much overexposed image, also near-equal on 2MASS J) --- spectral type K7 (1984AJ.....89..702L, 2004AJ....128..463R, probably combined light) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 6-13 is cpm pair Date: Fri, 02 Apr 2010 14:23:42 -0700 This one is in the realm where Luyten or Lepine should have found it --- ah, a little below their motion limit. UCAC3 has a double entry for the primary, and a single-epoch position for the secondary. G 6-13 = TYC 0656-1232-1 = UCAC2 36233199 = 2MASS J03293226+1248103 3 29 32.27 +12 48 10.0 (J2000, UCAC2) --- separation 11".14 in pa 129.6, epoch 1997.742 (2MASS) --- V = 11.5 + 15.4 (published V for primary, Bordeaux meridian circle [VizieR catalogue I/300] for secondary, which is roughly in the middle of several other rough determinations) --- spectral type G8 (1984AJ.....89..702L, primary only, marked as 'poor' quality); UBV colors suggest slightly later type (K0) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 03379+1950 = LDS 3515 observation Date: Fri, 02 Apr 2010 15:11:26 -0700 2MASS shows: 5".41 in pa 33.6, epoch 1998.750 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 79-56 cpm companion Date: Fri, 02 Apr 2010 15:35:17 -0700 Lepine shows this explcitly, but apparently he didn't flag it as a new pair. Also appears in UCAC2 and UCAC3. UCAC2 has discrepant motion for the faint star (so sep/pa are no good), and UCAC3 has unknown provenance. Note that on the POSS-I images there is an underlying background star near the primary. G 79-56 = TYC 0657-0279-1 = UCAC2 34958562 = 3UC 199-011800 = 2MASS J03414242+0923330 = SDSS J034142.51+092331.4 3 41 42.427 +09 23 33.2 (J2000, UCAC2) --- separation 7".27 in pa 302.2, epoch 2000.019 (2MASS) 7".20 in pa 304.3, epoch 1994.3251 (SDSS DR7) 7".11 in pa 300.5, epoch 2000.0 (LSPM, which is Tyc2-Superblink) 7".14 in pa 301.6, epoch 2000.904 (CMC14 n=4,3) --- V = 11.8 + 16.4 (published V for primary, SDSS g+r/2 for secondary) --- spectral type G8 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 84-33 is cpm pair Date: Fri, 02 Apr 2010 22:39:35 -0700 Stephenson (1986AJ.....92..139S) gave this as a resolved pair, and it appears as two entries in the LSPM, so not really a new pair. The motion is easy to see comparing POSS-I versus recent images. G 84-33 = StKM 2-400 = LSPM J0503+0505W/E 5 03 26.29 +05 05 49.7 (J2000, LSPM) --- separation 5".21 in pa 101.5, epoch 2000.537 (CMC14, n=3) 5".22 in pa 100.5, epoch 2000.055 (2MASS) --- V = 12.4 + 12.5 (published V = 11.69 and CMC14 delta-m = 0.1) --- spectral type M1 (1984AJ.....89..702L); Stephenson gave K4/5V for each, but this is too early wrt UBV colors =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, thenry@chara.gsu.edu, adric.riedel@gmail.com Subject: LHS 206 = G 99-10 cpm companion Date: Fri, 02 Apr 2010 23:39:27 -0700 This one is also shown as double by Lepine, so not new. Not in Hipparcos, but Yale parallax catalogue shows pi = 52 mas. G 99-10 = LSPM J0528+0258N/S = 2MASS J05281459+0258142 (primary) 5 28 14.60 +02 58 14.3 (J2000, LSPM) --- separation 4".44 in pa 185.0, epoch 2000.060 (2MASS) --- V = 12.8 + 17? (published V for primary, estimate for secondary); 2MASS delta-J = 2.7, but ~4 in the visible --- spectral type M3 (1984AJ.....89..702L, primary only); also M5V shown in the Gliese catalogue, quoted by van Altena, who gives the source as the GJ catalogue; there might be recent stuff I haven't got to yet. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 110-16 faint companion Date: Sat, 03 Apr 2010 12:24:57 -0700 A faint, close companion that comes up in 2MASS images (and just barely in DSS far-red). G 110-16 = TYC 0746-1403-1 = UCAC2 34432616 = 2MASS J06440073+0759367 6 44 00.73 +07 59 36.7 (J2000, UCAC2) --- separation 2".9 in pa 92, 1999.816 (estimates from 2MASS J,K) --- V = 11.4 + 19? (Tyc2/TASS MkIV for primary, estimate for secondary) --- spectral type K3 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 110-38 cpm companion Date: Sat, 03 Apr 2010 13:00:41 -0700 This one was listed by Lepine, but doesn't appear in the WDS. G 110-38 = TYC 1349-0233-1 = UCAC2 38239771 = 2MASS J07065413+1808114 7 06 54.13 +18 08 11.2 (J2000, UCAC2) --- separation 9".21 in pa 345.2, epoch 1997.873 (2MASS) --- V = 11.0 + 17? (TASS MkIV/Bordeaux meridian circle for primary, estimate for secondary) --- spectral type G8 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+40 2179 faint cpm companion Date: Sat, 03 Apr 2010 14:41:33 -0700 A faint companion visible on POSS-I and later images. BD+40 2179 = TYC 2987-0216-1 = UCAC2 45822417 = 2MASS J09155501+4014360 = SDSS J091554.98+401435.0 9 15 55.00 +40 14 35.6 (J2000, UCAC2) --- separation 10".68 in pa 289.5, epoch 1998.274 (2MASS) --- V = 10.4 + 20.0 (published V for primary, SDSS g+r/2 for secondary) --- spectral type G5 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 116-34 cpm companion Date: Sat, 03 Apr 2010 16:30:27 -0700 Another pair found by Lepine but not in the WDS. Easy to confirm on DSS/2MASS/SDSS images. G 116-34 = TYC 2994-1392-1 = UCAC2 45983649 = 2MASS 09305394+4054158 = SDSS J093054.03+405414.9 9 30 53.99 +40 54 15.4 (J2000, UCAC2) --- separation 7".23 in pa 54.8, epoch 1998.246 (2MASS) --- V = 11.1 + 19.6 (TASS MkIV V for primary, SDSS g+r/2 for secondary) --- spectral type M0 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 04019+2104 = LDS 5475 B comment Date: Sun, 04 Apr 2010 19:02:53 -0700 In the latest AJ (April 2010), Findeisen & Hillenbrand (2010AJ...139.1338F) note that the B component to this wide pair is a white dwarf/M-dwarf binary. They give it as 2MASS J04015065+2103495, and do not note the linkage with the brighter primary. Additional astrometry: source rho theta epoch USNO-A2.0 31.08 163.3 1950.936 APM 31.00 163.8 1950.936 GSC-2.3 31.15 163.7 1991.782 USNO-B1.0 31.15 163.8 2000.000 pm: +48,-46 and +48,-42 CMC14 31.05 163.8 2001.991 n=2 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Rst 5219 rediscovered Date: Sun, 04 Apr 2010 21:17:55 -0700 Again in the Apr 2010 issue of the AJ, Reipurth et al (2010AJ....139.1668R) show that what they call HBC 515 (= HD 288313 = BD+01 1156) is a close, nearly equal binary. The WDS shows that Rossiter mesaured it first in 1946. They flip in the position angle to pa 259, though the pair is likely to be variable. They obviously imply that it is new, and additional possibly-related components given as B,C,D will slightly mix the current WDS lettering scheme. The three more distant components are readily visible/measureable on the 2MASS K-band image. Another close binary is shown, 2MASS J05540455+0142587. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10418+5829 = LDS 2319 observations Date: Sun, 04 Apr 2010 22:30:02 -0700 Additional astrometry: source rho theta epoch GSC-2.3 40.44 314.2 1991.285 2MASS 40.41 314.1 2000.361 SDSS 40.41 314.9 2002.1202 Lee (1984AJ.....89..702L) gives type K5 for the primary. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 12416+4105 = LDS 5757 observations Date: Mon, 05 Apr 2010 21:10:37 -0700 I was a little worried that the LSPM (and hence UCAC3) proper motion for this wide pair were not the same, but evidently it's a problem with the LSPM motions. source rho theta epoch USNO-A2.0 150.43 150.2 1957.324 --- rather late for POSS-I UCAC2 150.27 150.3 2000.000 2MASS 150.38 150.3 2000.255 CMC14 150.33 150.3 2002.099 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 149-12 is cpm pair Date: Mon, 05 Apr 2010 21:52:03 -0700 This one becomes gradually better visible going from DSS to 2MASS to SDSS images. Available astrometry is relatively poor, so the nominal SDSS sep/pa is given along with two eyeball estimates. Looks like the SDSS measure is okay, and has the advantage of being reproducible! G 149-12 = TYC 1449-0603-1 = UCAC2 37545661 = SDSS J124942.29+161233.7 = 2MASS J12494231+1612355 2 49 42.31 +16 12 35.2 (J2000, UCAC2) --- 2".8 in pa 205, epoch 2005.4162 (SDSS DR7, primary saturated) 2".7 in pa 199, epoch 1998.058 (estimate from 2MASS J image) 2".6 in pa 209, epoch 2005.4 (estimate from SDSS u image) --- V = 11.4 + 14.2 (TASS MkIV/Bordeaux meridian circle for primary, SDSS g+r/2 for secondary) --- spectral type M2 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+42 2363 cpm companion Date: Tue, 06 Apr 2010 13:05:59 -0700 Another large-delta-mag case resolved more-or-less in recent images toward the red. The primary of course is saturated in SDSS, but I show that astrometry since it looks okay. 2MASS shows an entry at about 5" radius, but this appears to be spurious. BD+42 2363 = TYC 3024-0694-1 = UCAC2 46430963 = = SDSS J130045.45+421244.2 = 2MASS J13004557+4212442 13 00 45.56 +42 12 44.2 (J2000, UCAC2) --- separation 2".85 in pa 44.1, epoch 2003.2476 (SDSS DR7) --- V = 11.2 + 15.8 (Hip/CMC8/TASS MkIV for primary, SDSS g+r/2 for secondary) --- spectral type K6V (1986AJ.....92..139S, primary only) K5 (1984AJ.....89..702L, primary only) ...no particular preference As a slight distraction last night I looked through the Ramberg stars in Praesepe (1941StoAn..13i...1R), where I marked a bunch of pairs. All these were either known, present in UCAC3, or were clearly optical---so nothing to report! =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+35 2558 third comp Date: Tue, 06 Apr 2010 16:21:36 -0700 This is known to the WDS as WDS 14260+3422 = Gic 118. The distant co-moving B comp appears to be good, but the Pauwels C,D,E comps are all optical. However, A has a close companion visible in the SDSS z image and (less well) in the 2MASS images. BD+35 2558 AF: separation 2".50 in pa 298.7, epoch 2003.3164 (SDSS) V = 10.4 + 19? (estimate for secondary) spectral type K0 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 15368+3735 = LDS 4572 comment Date: Wed, 07 Apr 2010 14:05:56 -0700 Probably one less double star. I think I can see on the POSS-I images the thing about 10" E that is indicated by Luyten's measurement. But it does not show on later, deeper, higher-res images, notably the Sloan stuff, either at the 1960 location or at 10" E following the brighter star. Thus I suggest it does not exist, despite Lepine's including it in his catalogue. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+13 2984 faint hot comp Date: Wed, 07 Apr 2010 14:34:54 -0700 An unusual case where the companion is much brighter at shorter wavelengths than at longer ones, so presumably a white dwarf. A note in the Hipparcos catalogue indicates that the initial solution suggested an astrometric binary, but post-facto reprocessing results are given where it's taken as a single star. Probably not relevant in the present context. BD+13 2984 = TYC 0937-0378-1 = UCAC2 36482647 = SDSS J154200.37+130213.2 = 2MASS J15420035+1302146 15 42 00.36 +13 02 14.4 (J2000, UCAC2) --- separation 4".89 in pa 291.4, epoch 2005.3586 (SDSS DR7, n=2) --- V = 10.3 + 17.7 (ASAS-3 V for primary, SDSS g+r/2 for secondary) --- spectral type K2 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 138-5 cpm companion Date: Wed, 07 Apr 2010 15:01:19 -0700 A relatively easy one perhaps overlooked previously because at the epoch of the POSS-I plates the primary was superposed on a zero-motion background star. G 138-5 = TYC 1504-1316-1 = UCAC2 37729949 = 2MASS J16103372+1631408 16 10 33.72 +16 31 41.0 (J2000, UCAC2) --- separation 7".08 in pa 11.9, epoch 1998.334 (2MASS) --- V = 10.7 + 16.7 (published V for primary, SDSS g+r/2 for secondary) --- spectral type K2 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 225-50 cpm companion Date: Wed, 07 Apr 2010 15:14:14 -0700 This one is shown as double by Lepine, but is not in the WDS. G 225-50 = TYC 3880-1579-1 = 2MASS J16144492+5525494 16 14 44.90 +55 25 49.5 (J2000, Tycho-2) --- separation 3".85 in pa 203.3, epoch 1999.315 (2MASS) --- V = 11.2 + 15.7 (Tyc2/TASS MkIV for primary, SDSS g+r/2 for secondary) --- spectral type K3 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 180-49 faint companion Date: Wed, 07 Apr 2010 15:37:48 -0700 A pretty faint red companion not well recorded on the SDSS z or 2MASS images. The measurement is my estimate from the SDSS z image via SkyView. G 180-49 = 3UC 265-135027 = 2MASS J16201235+4212110 16 20 12.34 +42 12 10.9 (J2000, LSPM) --- separation 2".3 in pa 91, epoch 2002.4377 (SDSS z image) --- V = 11.7 + 18? (TASS MkIV for primary, estimate for secondary) --- spectral type G6 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 18534+1851 = LDS 5867 third comp Date: Wed, 07 Apr 2010 20:41:24 -0700 This primary of this very wide pair is a close common-motion pair. It is oval on DSS1 and DSS2, and resolved in 2MASS images. The 2MASS catalogue doesn't show separate entries, but SDSS does (even if no images appear in SkyView...). LDS 5867 A = G 184-40 = TYC 1592-0154-1 = UCAC2 38477079 18 53 22.91 +18 53 06.0 (J2000, Tycho-2) --- AC: separation 2".73 in pa 240.2, epoch 2004.7096 (SDSS DR7) --- V = 11.8 + 12.7, assumes WDS value for A (11.84) and delta-mag sufficient to bring combined light to V = 11.45 per ASAS-3 --- spectral type M1 (1984AJ.....89..702L, combined type for AC) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 19299+1618 = LDS 5878 observations Date: Wed, 07 Apr 2010 22:11:04 -0700 I'm guessing that Luyten's 1960 measure is an estimate since the pair don't seem to change between POSS-I and 2MASS, and the 2MASS separation is quite a bit smaller. LDS 5878: separation 2".62 in pa 331.1, epoch 2000.444 (2MASS) This is also in UCAC3, but the motion for the secondary is wrong due to crowding. The pair are currently passing another pair whose secondary shows up only in the near-IR, and is probably a background red star. If the POSS-I scans had better resolution it might be possible to convince oneself that it is a third red star in the motion pair, but can't see it. Interestingly, the pair (or group) shows up in the ASAS northern variables list with a 2.9-day period, ascribed to being a delta Cepheid, obviously wrong. The primary of the motion pair is a good x-ray source, consistent with Lee's type of M2. So if the period is real, it is the rotation period of the star. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 23-9 cpm companion Date: Wed, 07 Apr 2010 23:17:37 -0700 Luyten or Lepine shoulda picked this one up. Crowded field, so possibly the software got confused. UCAC3 shows the companion but with the pm field blank. None of the POSS-I scan sets that I know of have the fainter star (USNO-A2.0, APM, SuperCOSMOS); I give an estimate from the SkyView images mainly to show the common motion. Obviously the 2MASS value is the much preferred among the four below. G 23-09 = 3UC 191-227117 = LSPM J1943+0512 = 2MASS J19435729+0512068 19 43 57.28 +05 12 06.8 (J2000, LSPM) --- separation 13".75 in pa 243.9, epoch 2002.731 (CMC14, n=1) 13".78 in pa 244.1, epoch 1999.591 (2MASS) 13".91 in pa 245.7, epoch 1993.456 (GSC-2.3) 13".9 in pa 249 , epoch 1950.526 (POSS-I estimate) --- V = 11.3 + 17.1 (published V for primary, GSC-2.3 for secondary) --- spectral type K7 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 125-61 cpm companion Date: Fri, 09 Apr 2010 13:14:54 -0700 This one is shown by Lepine in the LSPM, but not in the WDS. G 125-61 = TYC 3150-1792-1 = 2MASS J20071851+3752435 20 07 18.55 +37 52 43.6 (J2000, Tycho-2) --- separation 22".19 in pa 155.7, epoch 1950.605 (USNO-A2.0) 22".90 in pa 156.7, epoch 1998.474 (2MASS) 22".93 in pa 157.0, epoch 2001.657 (CMC14 n=1,2) --- V = 11.7 + 16.2: (Carlsberg 11/TASS MkIV for primary, estimate for secondary) --- spectral type M0 (1984AJ.....89..702L, primary only) --- the primary is currently near a mag ~14.5 background star =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Pou 4348 cpm companion Date: Fri, 09 Apr 2010 16:37:10 -0700 The original Pourteau pair is optical, but there is a closer common motion companion that's been overlooked heretofore. Pou 4348 AC: 5".04 in pa 23.5, epoch 1999.493 (2MASS) V = 11.3 + 14: (WDS V, estimate for C comp) 2MASS shows the AB pair at: 25".04 in pa 161.1, epoch 1999.493 ...oh, Lee (1984AJ.....89..702L) calls the primary spectral type K3 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 21385+1902 = TDT 3077 third comp Date: Fri, 09 Apr 2010 20:48:28 -0700 This has a faint and relatively distant third component that is easy to see on various images. Shown by Lepine but not in WDS. The strong diffraction spike on the POSS-I images probably compromises the USNO-A2.0 position (plus the primary being overexposed). Overexposure certainly affects the SDSS position, too. TDT 3077 ABxC: 16".32 in pa 89.5, epoch 2004.7834 (SDSS DR7) 16".22 in pa 89.4, epoch 1999.750 (2MASS) 15".61 in pa 91.1, epoch 1951.725 (USNO-A2.0) --- V = 10.3 + 18.3 (published V for A+B, SDSS g+r/2 for C) --- spectral type G5 with weak uv CN (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 22050+0838 AC observations Date: Fri, 09 Apr 2010 22:29:46 -0700 Not quite sure what is going on, but the 1960 Luyten observation is in error or belongs to another pair. The impression is that the AC pair is optical, since there is a very large change in both pa and distance. But presumably the pair intended by Luyten is the one at 128" NE. And in fact the two stars have quite constant relative positions per these observations via VizieR: source rho theta epoch USNO-A2.0 127.93 40.2 1953.622 CMC14 128.18 40.2 2000.564 (n=4) 2MASS 128.19 40.2 2000.528 ...which makes it look like there's also a typo in the WDS pa for 2000, and the Luyten measure needs reconsideration. Another minor fix is to improve the V magnitude for the primary (Tycho-2 is a bit off). The Mermilliod UBV catalogue shows mean V = 12.038, the Geneva seven-color catalogue gives 12.022, and the Stromgren catalogue give 12.026. Lee (1984AJ.....89..702L) gives the spectral type as sdF8:, consistent with the UBV and uvby colors (metal poor). For the secondary V=16.5 looks okay. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 241-62 cpm companion Date: Sat, 10 Apr 2010 13:18:45 -0700 This close companion comes up at longer wavelengths, though the DSS images are noticeably oval. G 241-62 = TYC 4280-1547-1 = LSPM J2340+6041 23 40 07.69 +60 41 19.4 (J2000, Tycho-2) --- separation in 2".2 in pa 119, 1999.786 (estimate from 2MASS J,K images) --- V = 11.4 + 15? (published V for primary, estimate for secondary) --- spectral type M2 (1984AJ.....89..702L, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+41 2014 cpm companion Date: Sat, 10 Apr 2010 14:35:34 -0700 This is another one shown by Lepine but not in the WDS. His motion measurements are slightly divergent probably because the companion is well under the scattered light glow on the older plates, so he didn't pick it up in automatic mode. BD+41 2014 = TYC 2996-1029-1 = UCAC2 46142237 9 49 51.66 +41 11 06.6 (J2000, UCAC2) --- separation 11".36 in pa 122.5, epoch 1998.255 (2MASS) --- V = 9.9 + 16? (Tycho-2 V for primary, estimate for secondary) --- spectral type G3 (1984AJ.....89..702L, primary only from slit spectrogram) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+30 1962 faint companion Date: Sat, 10 Apr 2010 14:47:07 -0700 This is a poor case where the companion is visible only on the SDSS z image (slightly oval in 2MASS images). BD+30 1962 = TYC 1974-0966-1 = UCAC2 42060976 = SDSS J100710.19+292722.2 10 07 10.24 +29 27 22.7 (J2000, UCAC2) --- separation 3".32 in pa 102.9, epoch 2004.2881 (SDSS DR7) --- V = 9.4 + 18.6 (Tycho-2 V for primary, SDSS g+r/2 for secondary, which could be unreliable due to crowding) --- spectral type G2 (1984AJ.....89..702L, primary only from slit spectrum) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+26 2469 cpm companion Date: Sat, 10 Apr 2010 15:17:43 -0700 This faint companion appears on multiple images. BD+26 2469 = TYC 2000-0041-1 = UCAC2 41029155 13 33 21.11 +26 07 11.5 (J2000, UCAC2) --- separation 4".49 in pa 80.9, epoch 1997.455 (2MASS) --- V = 9.9 + 15.7 (published V for primary, SDSS g+r/2 for secondary, which could be unreliable due to crowding) --- spectral type K2 (1984AJ.....89..702L, primary only from slit spectrum) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+42 2466 cpm companion Date: Sat, 10 Apr 2010 17:53:06 -0700 This faint, distant companion has intermediate color, implying a degenerate well down to cooling curve. It is bright enough and far enough from the primary that I'm surprised that both Luyten and Lepine missed it. BD+42 2466 = TYC 3037-0029-1 = UCAC2 46292750 14 07 27.17 +41 35 01.8 (J2000, UCAC2) --- separation 30".37 in pa 103.1, epoch 1955.281 (USNO-A2.0) 30".33 in pa 103.7, epoch 2003.2258 (SDSS DR7) --- V = 9.9 + 19.7 (published V for primary, SDSS g+r/2 for secondary) --- spectral type G8 (1984AJ.....89..702L, primary only from slit spectrum) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 213996 cpm companion Date: Sun, 11 Apr 2010 00:00:56 -0700 Only a few entries left in the Lee motion-stars list (1984AJ.....89..702L), so this might be the last of the current batch. This faint companion is near a bright star, so the motion is evident only from the DSS2 and 2MASS images. Luckily there's a faint star nearly due west from which one can judge the motion (mostly southward) from the E-W diffraction spike of the primary star. HD 213996 = TYC 1154-0872-1 = UCAC2 36040546 22 35 05.67 +11 52 53.1 (J2000, UCAC2) --- separation 11".49 in pa 171.1, epoch 2000.591 (2MASS) --- V = 8.7 + 17? (published V for primary, estimate for secondary) --- spectral type K2 (1984AJ.....89..702L, primary only from slit spectrum) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 21305-0707 = LDS 6355 observation Date: Sun, 11 Apr 2010 13:37:11 -0700 SDSS DR7 has this nicely resolved: 2".12 in pa 92.7, epoch 2000.6741. V = 14.9 + 15.6 (SDSS g+r/2), consistent with combined V = 14.31 via Mermilliod UBV compilation. The latter also shows separate magnitudes: V = 14.96 and 15.36. In any case, about a full magnitude fainter than what the WDS shows at present. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD-01 1265 cpm companion Date: Sun, 11 Apr 2010 18:38:32 -0700 Giclas et al note this star to have similar motion as G 106-54 = LHS 6107. They found the motion vectors to differ by 12 deg in position angle. The proper motions available via VizieR for the faint star are a mixed bag. However, a naive difference of USNO-A2.0 minus 2MASS shows that its motion is essentially identical to the brighter BD star, and agrees with Salim & Gould, so it looks as though this is a very wide common-motion pair. BD-01 1265 = HD 291763 = Ross 615 = TYC 4798-0964-1 = UCAC2 31120005 6 31 23.11 -01 34 14.5 (J2000, UCAC2) --- separation 434".35 in pa 169.3, epoch 2001.025 (CMC14, n=2) 434".2 in pa 169.3, epoch 2000.0 (UCAC2/Salim & Gould) 434".4 in pa 169.3, epoch 1955.881 (USNO-A2.0) --- V = 10.1 + 13.9 (published V for primary, ASAS-3/Carlsberg/TASS for secondary) --- spectral type K2 (Kuiper via Bidelman 1985ApJS...59..197B, primary only) --- proper motion: A -249.1, -344.9 UCAC2 B -251 , -337 USNO-A2.0 minus 2MASS -252 , -336 Salim & Gould = UCAC3 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 14367-0830 = LDS 493 comment Date: Sun, 11 Apr 2010 20:42:42 -0700 I wonder if it is worth adding a note for this pair to say that around epoch 2000 and later it is the southeastern and fainter (in the visible) of two similar-looking pairs separated by roughly their own spacing. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 22367-1321 = LDS 2949 is double(!) Date: Sun, 11 Apr 2010 23:13:09 -0700 Since we don't have access to the list of positions, I wonder if the data for this has become mixed with the non-moving background star. In the NLTT Luyten reports the pair as 19".5 in pa 293. The WDS shows 16".9 in pa 281 for 1900, and 18".1 in pa 312 for 2000. But if these refer to the relatively bright non-moving companion, then at the early date the pa would have been in the second quadrant. On the other hand, I doubt there is such an early measure for the actual common-motion companion, which is way faint. From USNO-A2.0, I find: 19".25 in pa 290.2, epoch 1954.652. This is a reasonable match to Luyten's values, though it is probably compromised by the background companion, which was very close to the primary at that date. Later images show the co-moving companion very close to the background star, so it doesn't show up in recent catalogues. Okay, just barely in 2MASS, which gives: 19".81 in pa 294.1, epoch 2000.780; nominal errors on the coords for the secondary are 0".28 and 0".25 in RA/Dec, resp., i.e. 0".38 total. Pretty good match with Luyten's values. The 2000 date WDS measure must also be from 2MASS, but is for the non-moving star, so does not apply. The magnitude for primary is okay, and I would adopt for now Luyten's estimate for the secondary, which is 18.4 (photo-blue, but looks about right for V). Summary: --- the 1900 and 2000 observations in the WDS are wrong; the 1900 observation seems not to apply at all; the 2000 observation is for the wrong pair (A comp + non-moving background star) --- Luyten got it right in the 1954 measure, presumably from POSS-I --- correct but "soft" 2MASS observation for epoch 2000 shown above --- adjust magnitude for the faint component =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 08469+1753 coords typo Date: Mon, 12 Apr 2010 00:30:11 -0700 Probably as a result of my suggesting an improved position for this pair (central star of the PN Abell 30), the WDS now shows the coordinates with a +1m RA error. Should be at: 8 46 53.47 +17 52 46.3 (J2000, UCAC2) While I'm at it, SDSS DR7 shows: 5".25 in pa 145.1, epoch 2004.96, from the mean of two observations. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 00321-0511 = A 111 fourth component Date: Mon, 12 Apr 2010 21:19:00 -0700 In their notes to the Lowell proper motion survey, Giclas et al mention that their star G 158-97 "may share common proper motion" with the triple ADS 450 = G 158-98. From UCAC2 motions it appears this is indeed the case. The WDS shows an unrelated component D at 113", but this more distant true companion seems to have been overlooked. Some baseline measurements: WDS 00321-0511 AE: 431".02 in pa 351.4, epoch 2000.0 (UCAC2) 430".96 in pa 351.5, epoch 1951.599 (USNO-A2.0) --- the POSS-I result is surely ABCxE, but the UCAC2 values may be more properly ABxE, since they are heavily weighted by the Tycho-2 and UCAC astrograph data for the primary. the two are pretty consistent in any case! --- E component V = 14.53 (CMC10 ,n=4) 14.32 (ASAS-3, n=70) ...probably both similarly uncertain This and recent previous Giclas pairs result from keying-in the notes to the southern hemisphere stars from the Lowell proper motion survey. The printed summary catalogue that was used for the on-line files (I/112 in VizieR, the north = I/79) didn't include the notes --- for the southern stars they are scattered patchily among the whole series of publications. So even though there's a flag for the notes in VizieR, there's no link, as there is for the northern stars. Francois showed me how to do the mark-up so there'll be links for object-names into SIMBAD, bibcodes for citations, etc. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 00074-2936 = LDS 2088 observations Date: Tue, 13 Apr 2010 14:40:25 -0700 Just happened to notice the observations for this seem to show a significant positive position angle, whereas images suggest something darn close to zero from POSS-I up to 2MASS. Looks as though the separation might need some improvement, too, from modern astrometry. source rho theta epoch 2MASS 8.48 0.4 1998.849 DENIS 8.47 0.4 1998.687 GSC-2.3 8.67 359.7 1990.792 USNO-B1.0 7.81 356.3 2000.0 The USNO-B1.0 measure of the faint star includes only one second-epoch plate, so that one is clearly less good than the other three. USNO-A2.0 uses the UK Schmidt plates, and seems to skip the pair altogether. hmm....SuperCOSMOS shows: 8.06 0.4 1976.879 UK Schmidt blue 8.16 0.1 1981.749 ESO red 7.48 359.9 1990.793 UK Schmidt red 7.36 359.5 1990.896 UK Schmidt far-red ...obviously some problems in the scans here with the proximity of the two stars despite the 10-micron scan-pitch. Notice also the GSC-2.3 date nearly matches the UK Schmidt red plate, so the two results are from scans of the same exposure (presumably the original in Edinburgh, but a glass copy at STScI, which evidently worked better). So probably all of the Schmidt plate-based can be ignored except maybe the GSC-2.3 result, and just keep the 2MASS and DENIS figures. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr Subject: Coords for PS 2-31, a new double Date: Tue, 13 Apr 2010 15:40:48 -0700 This metal-poor blue star has approximate coordinates in SIMBAD, and I notice it seems to be a common-motion pair. The SIMBAD aliases appear to be complete. PS 2-31: 0 47 54.15 -32 53 48.5 (J2000, UCAC3) For the double star, the companion is resolved only in 2MASS: separation 4".02 in pa 153.4, epoch 2000.794. The common motion is clear from the DSS/2MASS images. V = 13.2 + 15.2, using the published V for the combined light (close to V=13.00) and estimated delta-mag of 2.0. Beers et al call this an extremely metal-poor main-sequence A star, but the UBV and Stromgren colors suggest a fairly ordinary but still metal-weak F dwarf (B-V = 0.40, U-B = -0.13). Indeed Graham & Slettebak call it sdF/G (1973AJ.....78..295G). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 271-77/76 cpm pair Date: Tue, 13 Apr 2010 22:00:37 -0700 This is mentioned as a cpm pair in the Lowell southern proper motion survey notes, but seems to have not made it into the WDS. G 271-77 = 2MASS J01295837-0038403 = SDSS J012958.39-003840.7 1 29 58.36 -00 38 40.5 (J2000, SDSS DR7) --- companion = G 271-76 = 2MASS J01295784-0038433 --- separation 8".61 in pa 249.5, epoch 1990.640 (GSC-2.3) 8".49 in pa 249.3, epoch 1998.717 (2MASS) 8".48 in pa 249.3, epoch 2000.652 (DENIS) 8".46 in pa 249.2, epoch 2001.598 (CMC14, n=3) 8".40 in pa 246.9, epoch 2002.6786 (SDSS DR7) --- Giclas gives 8" in pa 252 --- V = 14.1 + 15.4, assuming UCAC3 delta-mag (1.25) and combined V = 13.8 (ASAS-3) --- no spectral types available =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 271-94/99 is cpm pair Date: Tue, 13 Apr 2010 22:26:41 -0700 This is a very wide pair noted by Giclas et al in the Lowell proper motion survey. They give separation 7'.2 in pa 22. G 271-94 = BD-02 247 = TYC 4685-1476-1 = UCAC2 31097318 1 34 02.13 -01 41 10.0 (J2000, UCAC2) --- companion = G 271-99 = UCAC2 31097320 --- separation 431".90 in pa 20.8, epoch 2000.000 (UCAC2) 431".92 in pa 20.8, epoch 2000.904 (CMC14, n=4) 432".95 in pa 20.8, epoch 1951.684 (USNO-A2.0) ...also DENIS and 2MASS available ~1998 --- V = 9.8 + 14.8 (published V for primary, ASAS-3 for secondary) --- spectral type G0 (1958PMcCO..13b....V, primary only) --- Gould & Chaname' (2004ApJS..150..455G) seem to have this link also =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 23324-2155 = LDS 5098 observation Date: Wed, 14 Apr 2010 21:00:04 -0700 Nice catch on Luyten's part (or his machine); 2MASS shows 10".29 in pa 75.4, epoch 1998.657. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 00019-0952 = LDS 5157 observation Date: Wed, 14 Apr 2010 23:00:37 -0700 This one shows up nicely in the SDSS DR7: 2".77 in pa 73.9, epoch 2000.7373. V = 15.1 + 16.5 (SDSS g+r/2). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 158-35 + G 158-138 cpm pair Date: Wed, 14 Apr 2010 23:45:04 -0700 This one was pointed out as a possible cpm pair by Giclas et al in the very final Lowell proper motion survey paper. Both are recorded in UCAC2 with reasonably consistent motions. Also the POSS-I sep/pa are very close to the UCAC2 values. There is Sloan data, but the astrometry is a bit squirrely, so I've chosen the pair of mesaurements most consistent with UCAC2. G 158-35 = UCAC2 29386937 0 09 57.39 -06 36 14.9 (J2000, UCAC2) --- companion = G 158-138 --- separation 256".51 in pa 8.2, epoch 2000.0 (UCAC2) 256".53 in pa 8.2, epoch 1998.789 (2MASS) 256".57 in pa 8.4, epoch 1994.9524 (SDSS DR7) 256".54 in pa 8.2, epoch 1989.890 (GSC-2.3) 256".23 in pa 8.1, epoch 1954.676 (USNO-A2.0) --- V = 15.2 + 16.2 (estimates averaging various sources) --- spectral type for secondary M4.5Ve (2003AJ....126.3007R); the primary is surely an M dwarf also per the small delta-mag and 2MASS colors =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD-15 47 cpm companion Date: Thu, 15 Apr 2010 14:07:49 -0700 This star has a good common-motion companion visible on various images. BD-15 47 = TYC 5267-1055-1 = UCAC2 26364696 = 2MASS J00174828-1436235 0 17 48.32 -14 36 23.5 (J2000, UCAC2) --- separation 4".24 in pa 28.3, epoch 1998.479 (2MASS) --- V = 10.7 + 14.7 (published V for primary, SDSS g+r/2 for secondary) --- no spectral types available; UBV color for primary is consistent with an early-K dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 71-B5 cpm pair Date: Thu, 15 Apr 2010 19:59:43 -0700 While gathering the notes for the southern Lowell pm stars (now completed and sent to the CDS), I noticed that at least one of the 'Appendix' pairs was not shown in the WDS. These were pairs usually of contrasting color noticed in the course of the plate- blinking process that seemed to have parallel motion, but at a rate below the nominal cutoff of 0".27/year. Some may be optical, but I'll check that as I go through the series again. There are at least two good ones, since the very first one of the series is also not shown in the WDS: G 71-B5A = 3UC 199-005781 = 2MASS J01531029+0911266 = LSPM J0153+0911E 1 53 10.30 +09 11 26.8 (J2000, LSPM) --- separation 9".69 in pa 298.7, epoch 2000.0 (LSPM) 9".69 in pa 309.8, epoch 2000.0 (USNO-B1.0) 10".30 in pa 309.6, epoch 1999.257 (CMC14, n=1) 10".14 in pa 309.4, epoch 1991.689 (GSC-2.3) 9".64 in pa 308.6, epoch 1949.893 (USNO-A2.0) ...LSPM pa is clearly wrong from visual inspection, but the two wider separations from GSC-2.3 and CMC are not obviously in error --- V = 14.2 + 17.6 (assumes GSC-2.3 delta-m and combined V = 14.1 from ASAS-3); similar values shown by Lepine --- later literature confirms this as an M-dwarf/white dwarf pair (brighter comp is M dwarf) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 14784 cpm companion Date: Thu, 15 Apr 2010 20:23:15 -0700 This one is G 94-B5, and perhaps has been missed in automated surveys since the companion is right on the eastern diffraction spike of the bright primary. HD 14784 = TYC 1221-1534-1 = UCAC2 39608713 2 23 34.20 +22 27 28.8 (J2000, UCAC2) --- separation 25".51 in pa 88.6, epoch 1953.778 (USNO-A2.0) 26".09 in pa 89.3, epoch 1983.683 (GSC v1.2) 26".09 in pa 89.3, epoch 1983.683 (GSC-ACT) 25".88 in pa 89.9, epoch 2004.7236 (SDSS DR7) --- V = 8.3 + 15.9 (published V for primary, SDSS g+r/2 for secondary) --- spectral types G0 + DAn (HD for primary, 1965ApJ...141...83E for secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 105-B2 cpm pair Date: Thu, 15 Apr 2010 20:52:23 -0700 A fairly wide one in a semi-crowded field. G 105-B2A = USNO-B1.0 1000-0100402 = 2MASS J06274404+1000520 6 27 44.05 +10 00 52.1 (J2000, 2MASS) --- separation 125".93 in pa 310.7, epoch 1951.914 (USNO-A2.0) 125".63 in pa 310.5, epoch 1999.802 (2MASS) 125".96 in pa 310.6, epoch 2002.778 (CMC14) --- 2MASS coords for the faint, blue companion are relatively poor --- UCAC3 motion for the primary is incorrect; crowding of the primary probably caused Lepine to miss the star as well, but as can be seen by the specs above, the motion is parallel --- V = 13.3 + 16.6 (1965ApJ...142..925E) --- spectral types M2V + DF (1965ApJ...142..925E) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 111-B9 cpm pair Date: Thu, 15 Apr 2010 21:06:42 -0700 Another wide one. G 111-B9A = 3UC 256-094018 = 2MASS J08174984+3746102 = SDSS J081749.85+374610.1 --- separation 66".51 in pa 63.9, epoch 2000.0 (UCAC3) 66".52 in pa 63.8, epoch 1998.285 (2MASS) 66".58 in pa 63.8, epoch 1989.913 (GSC-2.3) --- V = 13.7 + 15.4 (1965ApJ...142..925E) --- spectral type K5V (1965ApJ...142..925E, primary only); 2MASS colors for companion imply cool degenerate =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 117-B11 cpm pair Date: Thu, 15 Apr 2010 21:29:28 -0700 I thought there would be just a few of these missing, but I'm still on the first group of them. G 117-B11A = 2MASS J09462113+3251176 = SDSS J094621.17+325116.9 = USNO-B1.0 1228-0229446 9 46 21.15 +32 51 17.7 (J2000, USNO-B1.0) --- separation 12".25 in pa 16.0, epoch 2004.1296 (SDSS DR7) 12".29 in pa 16.1, epoch 2001.715 (CMC14, n=4) 12".20 in pa 15.5, epoch 2000.0 (USNO-B1.0) 12".25 in pa 15.8, epoch 1998.291 (GSC-2.3) 11".80 in pa 15.4, epoch 1998.181 (2MASS) 12".27 in pa 13.7, epoch 1955.196 (USNO-A2.0) --- V = 15.3 + 17.2 (SDSS DR7 g+r/2) --- later papers shows MD + WD pair (M dwarf brighter) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 162867 cpm companion Date: Thu, 15 Apr 2010 22:01:50 -0700 Another good white dwarf companion found by Giclas et al.; also shown by Lepine. HD 162867 = TYC 1011-0534-1 = UCAC2 35240129 17 52 56.57 +09 48 13.7 (J2000, UCAC2) --- separation 24".73 in pa 209.1, epoch 2000.0 (LSPM, which is a combination of Tycho-2 and Superblink coords) 24".54 in pa 209.4, epoch 2000.394 (2MASS) 24".30 in pa 210.3, epoch 1956.204 (USNO-A2.0) --- V = 9.4 + 15.7 (Tycho-2 for primary, 1965ApJ...141...83E for secondary) --- spectral types K2V + DC (1965ApJ...141...83E for primary, 1983AJ.....88.1034W for secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Spectral types for LDS 1019 Date: Thu, 15 Apr 2010 22:05:30 -0700 A Giclas pair already known in the WDS, but Eggen & Greenstein gave types many moons ago: sdM2 + DAn (1965ApJ...141...83E); the M dwarf is the primary. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 129-D1 cpm pair Date: Thu, 15 Apr 2010 22:26:16 -0700 I had previously flagged these as possibly optical, but comparison of the USNO-A2.0 separation with new measurements shows they're a common motion pair. Notice for instance that the USNO-B1.0 motions are similar, but not quite close enough to be comfortable with. G 129-D1 = 2MASS J23432185+1447159 = SDSS J234321.85+144715.6 23 43 21.85 +14 47 15.9 (J2000, USNO-B1.0) --- separation 22".68 in pa 131.7, epoch 2000.7401 (SDSS DR7) 22".62 in pa 131.9, epoch 1997.745 (2MASS) 22".66 in pa 131.9, epoch 1995.817 (GSC-2.3) 22".61 in pa 135.4, epoch 1951.607 (USNO-A2.0) --- V = 14.1 + 14.4 (1965ApJ...142..925E) --- spectral types sdM0 + sdF5? (1965ApJ...142..925E) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 154-B5 cpm pair Date: Thu, 15 Apr 2010 22:42:13 -0700 Due to crowding and only modest motion, this one hasn't been noticed previously for the WDS. The primary is an Hipparcos star. G 154-B5 = TYC 5673-0297-1 = UCAC2 27137506 = 2MASS J17455334-1318223 17 45 53.35 -13 18 22.3 (J2000, UCAC2) --- separation 32".24 in pa 33.3, epoch 1998.320 (2MASS) 32".28 in pa 33.2, epoch 2002.520 (CMC14, n=1) --- V = 11.9 + 14.3 (published V for both stars, probably from 1965ApJ...142..925E) --- spectral types M3V + DA (1965ApJ...142..925E) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Lep 65 = G 165-B5 Date: Thu, 15 Apr 2010 22:55:40 -0700 This was also noticed by Giclas et al back in the 1960s, where they gave separation 58" in pa115. The USNO-A2.0 measurement is: 55".92 in pa 113.9, epoch 1950.364. Eggen & Greenstein gave a type for the white dwarf secondary as DA (1967ApJ...150..927E). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LDS 1288 additional observations Date: Thu, 15 Apr 2010 23:14:39 -0700 source rho theta epoch SDSS DR7 6.60 329.1 2004.34 n=2 CMC14 6.60 327.1 2000.364 n=1 GSC-2.3 6.42 329.6 1993.217 V = 15.2 + 17.0 (SDSS g+r/2) V = 16.95 from Mermiiliod compilation for secondary (probably Eggen) spectral types: M + DC/DF 1977ApJ...218L..21G =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+33 2834 cpm companion Date: Thu, 15 Apr 2010 23:40:27 -0700 This white dwarf comp has been overlooked since the 1960s. The companion is involved in diffraction spikes on the Schmidt plates. BD+33 2834 = TYC 2595-1467-1 = UCAC2 43456604 17 08 49.24 +33 12 55.4 (J2000, UCAC2) --- separation 36".64 in pa 83.3, epoch 1954.509 (USNO-A2.0) 35".42 in pa 85.3, epoch 1998.268 (2MASS) 35".62 in pa 84.5, epoch 2001.3946 (SDSS DR7) --- V = 8.6 + 15.9 (Tycho-2 for primary, published V for secondary) --- spectral types F8 + DA (Vyssotsky via 1952CoRut..32....1H for primary, 1967ApJ...150..927E for secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 216-B14 cpm pair Date: Fri, 16 Apr 2010 11:44:07 -0700 Another MD+WD pair found in the Lowell proper motion survey. The companion is faint enough that finding existing astrometry for both stars at the same epoch is a problem. G 216-B14A = TYC 3220-1119-1 = UCAC2 46061998 23 01 07.68 +40 56 19.6 (J2000, UCAC2) --- separation 25".02 in pa 257.7, epoch 2000.0 (UCAC2 for primary minus USNO-B1.0 for secondary) 25".21 in pa 256.9, epoch 2001.816 (CMC14, n=1) 24".82 in pa 256.0, epoch 1953.830 (USNO-A2.0) --- V = 11.7 + 16.8 (Tyc2/TASS MkIV for primary, estimate via GSC-2.3/CMC14 for secondary) --- spectral types sdK8 + DA (1969ApJ...158..281G) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 271-B4 cpm pair Date: Fri, 16 Apr 2010 12:47:40 -0700 After several that are not obviously pairs, here's a wide isolated one that looks good. G 271-B4A = USNO-B1.0 0889-0017379 = SDSS J014252.23-010318.9 1 42 52.22 -01 03 18.9 (J2000, USNO-B1.0) --- separation 65".29 in pa 149.3, epoch 1951.684 (USNO-A2.0) 65".33 in pa 149.2, epoch 1996.15 (ACR) 65".36 in pa 149.2, epoch 2002.6787 (SDSS DR7) 65".28 in pa 149.1, epoch 2002.734 (CMC14, n=1) --- V = 15.4 + 16.1 (SDSS DR7 g+r/2) --- no spectra; SDSS and 2MASS colors suggest these are K dwarfs --- for what it's worth, the ACR Flagstaff transit circle data show motions of 0.225, -5.40 and 0.249,-5.28 (timesec/century and arcsec per century); USNO-B1.0 shows +26,-46 and +34,-36 mas/year; Gould's SDSS/B1.0 match shows +32,-49 and +38,-45 mas/year =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 272-B2 cpm pair Date: Fri, 16 Apr 2010 13:41:15 -0700 This has clear common proper motion from DSS etc images. This is a red dwarf/white dwarf pair, and I'm taking the northern white dwarf (or maybe hot subdwarf) component as the primary since it is brighter in the SDSS g-band image. They switch of course at longer wavelengths. G 272-B2A = 3UC 149-004918 = USNO-B1.0 0742-0019772 = SDSS J020056.77-154609.5 2 00 56.71 -15 46 09.8 (J2000, 2MASS) --- separation 5".68 in pa 172.7, epoch 1953.863 (USNO-A2.0) 7".81 in pa 173.0, epoch 1995.1219 (SDSS DR7) 7".75 in pa 172.9, epoch 1999.649 (DENIS, n=2) 7".79 in pa 172.7, epoch 2000.887 (2MASS) 7".85 in pa 172.1, epoch 2005.014 (CMC14, n=1) ...the A2.0 separation is probably wrong due to proximty effects --- V = 14.8 + 15.6 (assumes UCAC3 delta-mag = 0.8 and ASAS-3 combined V = 14.4) --- Silvestri et al (2005AJ....129.2428S) shows types of DBA + M3V, but I don't know where they come from, if not from their own spectra =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 273-B15 cpm pair Date: Fri, 16 Apr 2010 14:06:55 -0700 A relatively close one with obvious common motion. G 273-B15A = 3UC 148-394704 = 2MASS J23442021-1610512 23 44 20.22 -16 10 51.3 (J2000, UCAC3) --- separation 5".58 in pa 3.0, epoch 1999.424 (2MASS) 6".39 in pa 2.1, epoch 2003.947 (CMC14, n=1) 6".7 in pa 1 , epoch 1951.665 (estimate from POSS-I blue plate via SkyView) ...the white dwarf component is so faint in the 2MASS images that I think the measurement is no good; only the single Carlsberg observation, but probably okay as an indicative measure; the POSS-I estimate mainly shows the CMC observation is more likely to be correct --- V = 14.4 + 15.4 (estimated delta-mag of 1.0 assumed with combined V = 14.05 +/- 0.20 from ASAS-3); CMC14 delta-r = 2.15, but ~0 on POSS-I blue --- red dwarf/white dwarf pair (northern star is the white dwarf) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 273-B1 cpm pair Date: Fri, 16 Apr 2010 14:45:13 -0700 Another large delta-mag pair with obvious common motion. G 273-B1A = BD-08 6206 = TYC 5831-0189-1 = UCAC2 29027111 23 53 28.65 -08 04 19.5 (J2000, UCAC2) --- separation 23".70 in pa 213.4, epoch 2003.780 (CMC14) 23".77 in pa 213.9, epoch 1999.627 (DENIS) 23".54 in pa 213.6, epoch 1998.797 (2MASS) 23".61 in pa 213.4, epoch 1954.0 (USNO-A2.0, but N.B separate epochs) ...faint white dwarf comp barely detected in 2MASS, so that measured certainly less good --- V = 11.1 + 15.4 (Tyc2/ASAS-3 for primary, Lick photo-V for secondary, also V=15.6 from NOMAD) --- McCook WD catalogue shows the secondary as type DA3; primary is likely early-K dwarf per 2MASS colors --- shown with (nearly) common motion in Lick NPM1 catalogue (1987AJ.....94..501K); that astrometry gives 23".39 in pa 212.0, presumably for mean epoch 1969.65 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: G 275-B8 cpm(?) pair Date: Fri, 16 Apr 2010 15:36:35 -0700 The motion is small here, but UCAC2 and UCAC3 agree is making them have very similar motion. Not far from the naked-eye star HR 8802. The southern component of the pair is slightly brighter in the blue, and taken as 'A' here. G 275-B8A = UCAC2 20057539 23 08 27.76 -28 48 20.0 (J2000, UCAC2) --- separation 14".08 in pa 0.9, epoch 2003.745 (CMC14, n=1) 14".10 in pa 0.9, epoch 2000.0 (UCAC2) 14".10 in pa 0.9, epoch 1998.542 (2MASS) 14".16 in pa 1.3, epoch 1983.562 (USNO-A2.0) --- V = 15.7 + 15.7 (the four USNO-B1.0 b+r values averaged for each component); no really good values exist --- southern component is relatively blue; the red(der) 2MASS colors result from the bright background from HR 8802 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 13 cpm companion Date: Fri, 16 Apr 2010 18:59:10 -0700 The final job from the Lowell proper motion survey is to deal with the GD stars, nominally white dwarf suspects. These are a mixed bag in SIMBAD, and need to be cleaned up for linking with later surveys where actual spectral types are provided. The first ~500 I think are pretty well studied thanks mostly to Jesse Greenstein, but after that they're pretty much unlinked in SIMBAD (1700 stars total). I think also many of the higher-numbered stars are F subdwarfs and A-type horizontal branch stars, and thus fairly distant compared to the WDs, so probably there won't be very many pairs among them. Very few are mentioned by Giclas et al. Most have only the original semiaccurate coordinates in SIMBAD. Anyway, GD 13 is an obvious pair with modest common motion, not previously noticed. GD 13 = 3UC 265-013871 = SDSS J012942.69+422817.8 = USNO-B1.0 1324-0032060 1 29 42.58 +42 28 17.2 (J2000, USNO-B1.0) --- separation 4".90 in pa 218.5, epoch 2004.7075 (SDSS DR7) 4".94 in pa 218.2, epoch 1999.701 (2MASS) --- V = 14.9 + 19.0 (SDSS DR7 g+r/2) --- spectral type DA (1969ApJ...158..281G, primary); the companion is an M dwarf per SDSS and 2MASS colors --- it is the brighter star from Sloan z redward =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: 3UC 195-006085/84 confirmed Date: Fri, 16 Apr 2010 19:29:40 -0700 This pair lies in the field of GD 20. It is a resolved 5,6 pair in UCAC3, but secondary has the usual 'radial' large proper motion. SDSS specs are: 2".93 in pa 216.9, epoch 2005.7807. V = 13.3 + 14.3, assuming delta-mag = 1.0 and ASAS-3/TASS MkIV combined V = 12.95. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 48 cpm pair Date: Fri, 16 Apr 2010 21:12:06 -0700 This is a fairly close WD/MD pair showing obvious common motion. 2MASS and DENIS show the position only of the red component, while the visible-light catalogues are probably giving a center-of-blob. The sep/pa is the average of two estimates from the DSS2 red and far-red plates. GD 48 = USNO-B1.0 0766-0035757 = 2MASS J03432892-1318163 3 43 28.9 -13 18 16 (J2000, 2MASS rounded coords) --- separation 3".2 in pa 77, estimates from DSS2 red/far-red images, red epoch 1984.9733, far-red unknown but similar --- V = 16.5 + 16.5, assumes delta-mag = 0 and GSC-2.3 b+r/2 for combined light --- SW comp is the white dwarf, NE comp is M dwarf; 2MASS J-K = 0.85, consistent with M dwarf --- CMC14 minus USNO-A2.0 proper motion: +85, -103 mas/year; might be off a bit if the CMC observation favors the red comp more than A2.0 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 60 cpm companion Date: Fri, 16 Apr 2010 21:56:40 -0700 A wide pair shown by Lepine but not in the WDS. GD 60 = LSPM J0420+3335 4 20 11.20 +33 35 37.0 (J2000, LSPM) --- separation 70".30 in pa 134.4, epoch 2000.0 (LSPM) 70".57 in pa 134.6, epoch 1955.810 (USNO-A2.0) --- V = 15.3 + 17.8 (published V for primary, GSC-2.3 for secondary) --- spectral type DA (1975ApJ...202..191W, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 122 cpm pair Date: Sat, 17 Apr 2010 13:10:16 -0700 This is another pair shown as having common motion by Lepine, but not in the WDS. GD 122 = LSPM J1032+3240E = USNO-B1.0 1226-0231837 10 32 05.85 +32 40 07.6 (J2000, SDSS DR7) --- B component = LSPM J1032+3240W --- separation 33".96 in pa 278.6, epoch 2004.2882 (SDSS DR7) 33".86 in pa 278.6, epoch 2000.099 (CMC14, n=2) 34".42 in pa 278.1, epoch 2000.0 (LSPM) 33".95 in pa 279.0, epoch 2000.0 (USNO-B1.0) 34".43 in pa 280.1, epoch 1998.928 (2MASS) 33".89 in pa 278.6, epoch 1989.176 (GSC-2.3) 33".86 in pa 278.4, epoch 1954.255 (USNO-A2.0) ...the primary is very faint for 2MASS, which probably explains both 2MASS and LSPM poor sep/pa in this list --- V = 16.1 + 17.5 (published V for primary, SDSS g+r/2 for secondary) --- spectral type DB (1983AJ.....88.1034W, primary only); secondary is an M dwarf per 2MASS colors =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 14247+0917 = Skf 44 comment Date: Sat, 17 Apr 2010 15:01:53 -0700 Looking at the SDSS photometry for this pair, a reasonable V magnitude for the secondary is 20.8, just taking g+r/2. The WDS presently shows 15.3, which seems to be somewhere between I and J. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LDS 1145 error ? Date: Sun, 18 Apr 2010 21:12:29 -0700 This pair nominally lies in the field of the blue star GD 285. The star at the WDS position, however, seems to have near-zero motion, and certainly not the +225 mas/year indicated. (USNO-B1.0 motion for the star is -4, -6 mas/year.) In addition there is no star 57" east, as indicated. GD 285 has modest motion of +94, -62 mas/year per B1.0, and I don't see any other stars with that motion in a 3'x3' field. It is at: 3 26 42.78 +69 24 17.2 (J2000, USNO-B1.0). Perhaps LDS 1145 has been misidentified at some point. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: RX J112524.9+542221 M dwarf pair Date: Sun, 18 Apr 2010 22:24:09 -0700 Happened to notice this in my spectral-types file near one of the GD stars. There are certainly a bunch more of these with types observed in the same paper (2000MNRAS.311..456M). RX J112524.9+542221 A = 2MASS J11252509+5422196 = SDSS J112525.08+542219.8 11 25 25.10 +54 22 19.7 (J2000, 2MASS) --- separation 5".24 in pa 101.0, epoch 2000.238 (2MASS) 5".19 in pa 101.4, epoch 2002.2482 (SDSS DR7) --- V = 15.5 + 15.7 (SDSS g+r/2) --- spectral types M4e + M4e (2000MNRAS.311..456M) --- no motion obvious for either star, but of course the odds of an identical pair of M dwarfs so close together at high galactic latitude being optical is zilch. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 325 is cpm pair Date: Mon, 19 Apr 2010 15:02:48 -0700 This one was given as spectral type DB + M by Greenstein (1975ApJ...196L.117G), and is resolved in the DSS images/catalogue. I take the DB star as the primary below (again they flip delta-mags in the near-IR). GD 375 A = SDSS J133601.78+482846.0 13 36 01.781 +48 28 46.1 (J2000, SDSS DR7) --- separation 3".01 in pa 71.8, epoch 2003.0870 (SDSS DR7) --- V = 14.0 + 16.6 (published V for primary, SDSS g+r/2 for secondary) --- spectral types DB4 + M (1986ApJS...61..305G for primary, 1975ApJ...196L.117G for secondary) --- the red companion is visible on the POSS-I red plate, and can be seen to follow the DB star in later images; the pair was passing just north of a very faint background star (mag 21 in SDSS) at the epoch of the POSS-I and -II images --- the M dwarf comp = 2MASS J13360209+4828472 From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: GD 325 is cpm pair Date: Mon, 19 Apr 2010 15:22:11 -0700 Just looked at this in SIMBAD to find that it's been reported previously. Greenstein apparently did not resolve it in a later paper of his (1986AJ.....92..867G), so perhaps the earliest mention is by Wachter et al (2003ApJ...586.1356W) from 2MASS data, or by van den Besselaar et al (2005A&A...434L..13V) from SDSS data. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Faint pair near GD 377 Date: Mon, 19 Apr 2010 20:34:25 -0700 Happened to notice this only ~15" from the unrelated GD star. Nicely resolved on SDSS images, but single in the photometric catalogue. SDSS J182242.17+415955.5 = 2MASS J18224214+4159558 18 22 42.15 +41 59 55.8 (J2000, SDSS/2MASS) --- coords are for photocenter, essentially identical in both catalogues (small delta-mag) --- separation 1".6 in pa 194, epoch 2005.4439 (mean of estimates from SDSS g,r,i images via SkyView) --- 15.5 + 15.8 combined V = 14.9 from SDSS g+r/2, and estimated delta-mag = 0.3 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 392 cpm companion Date: Mon, 19 Apr 2010 21:52:02 -0700 This is another common motion pair found by Lepine, but not in the WDS. The primary is GD 392. The companion is evidently a spectroscopic binary. GD 392 = LSPM J2100+3426W = 2MASS J21002150+3426209 21 00 21.51 +34 26 21.0 (J2000, LSPM) --- companion = LSPM J2100+3426E --- separation 46".34 in pa 102.7, epoch 2000.0 (LSPM) 46".6 in pa 103.8, epoch 1951.517 (POSS-I, involving USNO-A2.0 coords for primary and mean of estimates from red+blue plates via SkyView (plate solutions somewhat different, giving discrepant positions from each plate) --- V = 16.0 + 19.2 (LSPM) --- spectral types DB5 + (DC14.4 + DB) (McCook WD catalogue) --- substantial SIMBAD biblio for the companion from 2004 onward, so it is already pretty well studied =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 400 cpm companion Date: Mon, 19 Apr 2010 22:06:47 -0700 This is a faint WD/MD pair. The GD star is the northwestern component, taken as the primary here. GD 400 = CMC14 220335.0+361130 22 03 35.09 +36 11 30.2 (J2000, CMC14, epoch 2001.643) --- red companion = 2MASS J22033516+3611267 (epoch 2000.383) --- separation 3".5 in pa 166 (CMC14-2MASS, good enough as a placeholder despite slightly different epochs) 3".6 in pa 165 (estimate from POSS-II red plate) --- V = 17.6 + 17.6 (assumes delta-mag = 0 and GSC-2.3 combined V = 16.9) --- probably WD + M though no spectra available; primary disappears in 2MASS images, and 2MASS color for secondary consistent with M dwarf --- USNO-B1.0 motion is +140, -16 mas/year =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 422 cpm companion Date: Tue, 20 Apr 2010 13:40:16 -0700 This one appears in the LSPM without a WDS entry. Looks like another WD+MD combination per colors. GD 422 = LSPM J0204+7538S = USNO-B1.0 1656-0021200 2 04 39.04 +75 38 19.0 (J2000, LSPM) --- companion = LSPM J0204+7538N = USNO-B1.0 1656-0021209 --- separation 33".87 in pa 25.9, epoch 1999.126 (2MASS) 33".86 in pa 26.0, epoch 1993.640 (GSC-2.3) 33".55 in pa 25.6, epoch 1954.723 (USNO-A2.0) --- V = 15.6 + 18.9 (GSC-2.3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GSC 4388-0085 cpm companion Date: Tue, 20 Apr 2010 15:44:47 -0700 Another adventitious one in the field of a GD star. The common motion is easy to see between POSS-I and later images; NOMAD also shows common motion for the two stars. GSC 4388-0085 = 3UC 323-044055 = 2MASS J10522570+7116281 10 52 25.71 +71 16 28.1 (J2000, 2MASS) --- separation 7".11 in pa 354.9, epoch 1999.203 (2MASS) --- V = 14.1 + 15.8 (assumes UCAC3 delta-mag and TASS MkIV combined V = 13.9) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Eggen doubles Date: Tue, 20 Apr 2010 21:41:52 -0700 After checking the ID for a Henize star in the ApJ Supplements, I was scanning Eggen's paper in the same volume (1976ApJS...30..351E), which contains UBVRI for proper motion stars at the SGP. He mentions several "new" double stars, so I looked at one to see if it was in the WDS. It looks as though this will be another source of candidate pairs. The one I happened to look at is: BPM 46644 A = 3UC 114-001976 = 2MASS J00483817-3317171 0 48 38.18 -33 17 17.1 (J2000, 2MASS) --- separation 5".13 in pa 70.1, epoch 1998.868 (2MASS) --- assumes UCAC3 relative magnitudes are exact; 2MASS has them reversed, but both catalogues have them equally bright within their errors, so first quadrant position angle taken by default --- V = 14.7 + 14.7 (delta-mag = 0, Eggen shows V = 14.59 for one star [he doesn't specify which]; also Eggen combined V = 13.94 and V = 13.93 from ASAS-3: Eggen says sometimes the photometry was done under non-photometric conditions, but this one seems to be okay; I assume the combined light values are more accurate, so make each component 0.1 fainter than Eggen has for the one) --- UCAC3 motion for NE component is possibly correct, but the motion for the other star is 'radial' (i.e. wrong) --- Eggen B-V = 0.93 for the one component, and 0.95 for the pair, consistent with K2 dwarf pair Recovering this involved looking in the printed BPM catalogue for coordinates, then finding the pair on wide-field DSS images, then going to VizieR as usual for the rest. Eggen calls this "EDS 21" (Eggen Double Star) in the notes, but the next such new pair is assigned the same number, so clearly there is a bookkeeping problem that might carry over from earlier papers. (You may know that Eggen's papers are loaded with typos. Wayne Warren, retired catalogue guru from Goddard, once told me that Eggen confessed to him that he never proofread the tables of his papers.) A search on the BPM acronym in SIMBAD shows about 1700 stars, many of which have either approximate coordinates or no positions at all. Yet another little janitorial project for SIMBAD.... =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 553 faint companion Date: Wed, 21 Apr 2010 15:14:35 -0700 This one pops up at SDSS z and in 2MASS images. GD 553 = TYC 4286-0905-1 = 3UC 311-111928 = 2MASS J22515299+6503591 22 51 53.015 +65 03 59.2 (J2000, UCAC3) --- separation 2".2 in pa 87, epoch 2003.7376 (estimate from SDSS DR7 z-band image) --- V = 11.9 + 18? (published V for primary, estimate for secondary) --- UBV and 2MASS colors are consistent with K dwarf primary, secondary obviously very red) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 23213+6927 = LDS 5078 observations Date: Wed, 21 Apr 2010 15:49:28 -0700 source rho theta epoch USNO-A2.0 28.71 179.9 1952.628 GSC-2.3 28.86 179.8 1992.597 USNO-B1.0 28.73 179.7 2000.0 ...this is mainly to suggest that the WDS epoch 2000 observation has some error involved in both separation and position angle. Maybe a typo in the separation, viz 28".7 instead of 26".7. The source is listed as 2MASS in 2006AJ....132...50W, but the fainter component does not appear in 2MASS. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 674 cpm companion Date: Wed, 21 Apr 2010 23:45:06 -0700 This star has a faint M dwarf companion that seems to have common proper motion. GD 674 = USNO-B1.0 0652-0011683 = 2MASS J01033932-2444563 = DENIS J010339.3-244456 = NSV 15232 1 03 39.35 -24 44 56.6 (J2000, USNO-B1.0) source rho theta epoch USNO-A2.0 9.05 137.3 1985.260 GSC-2.3 9.08 137.9 1996.863 2MASS 9.55 137.1 1999.556 A coords poor DENIS 9.17 137.8 1999.608 mean of n=2 on consecutive nights USNO-B1.0 8.91 138.0 2000.0 --- probably 2MASS and B1.0 measurements are relatively poor --- V = 16.7 + 20.5 (GSC-2.3 b+r/2) --- spectral type DC6 (McCook WD catalogue); 2MASS J-K = 0.92 for secondary, so late-M type implied =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 683 cpm companion Date: Thu, 22 Apr 2010 13:05:01 -0700 This one was given as a "candidate" companion by Farihi et al 2005ApJS..161..394F. I noticed it from common motion in UCAC3, which seems to be okay here. This is a WD + MD pair. Interestingly, the ROSAT x-ray detection is squarely on the white dwarf rather than the M dwarf, so there may be other stuff going on here. GD 683 A = GSC 7001-1744 = USNO-B1.0 0544-0009712 = 3UC 109-002586 = 2MASS J01082074-3534416 1 08 20.77 -35 34 41.7 (J2000, UCAC3) --- B comp = 3UC 109-002589 --- separation 111".01 in pa 174.8, epoch 1985.136 (USNO-A2.0) 111".44 in pa 174.6, epoch 1996.786 (DENIS) 111".19 in pa 174.9, epoch 1997.918 (GSC-2.3) 111".23 in pa 174.6, epoch 1999.994 (2MASS) 111".07 in pa 174.9, epoch 2000.0 (UCAC3) --- V = 14.7 + 15.9 (published V for primary, GSC-2.3 b+r/2 for secondary) --- spectral type DA1.5 (2000AJ....119..241L, primary only); colors for secondary consistent with M dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 694 red companion Date: Thu, 22 Apr 2010 13:56:57 -0700 Can't say this one is a physical companion, but seems likely. The companion is red and comes up on the DSS far-red and 2MASS images. Estimates from the 2MASS images shown below. GD 694 A = USNO-B1.0 0728-0021319 1 18 18.75 -17 10 37.0 (J2000, USNO-B1.0) --- separation 2".1 in pa 136, epoch 1998.512 (estimates from 2MASS J&K images via SkyView) --- V = 16.6 + 16.6 (assumes delta-mag = 0 and GSC b+r/2 as combined V; the visible-light astrometry seems not far from mid-point, so delta-mag taken as zero) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10044+5023 = Reb 1 new obs Date: Thu, 22 Apr 2010 19:35:34 -0700 Tonight's astro-ph has a nice paper on this pair, with new photometry and astrometry. The naive SDSS astrometry shows: 16".23 in pa 209.3 for epoch 2002.2480; the very poor detections at g and r give: V = 23.6 from a straight average, which might be in the right ballpark even if the g magnitude is actually a non-detection. The new paper is: http://arxiv.org/abs/1004.3965 ...and from additional recent ground-based and Spitzer images, they provide: 15".99 in pa 209.2 with tiny errors, and say there is no orbital motion obvious in the 1998 - 2010 interval. They also derive an improved proper motion for the companion independent of the primary. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 706 cpm? companion Date: Thu, 22 Apr 2010 20:26:18 -0700 The motion is small here, but the sep/pa seems to be fixed. GD 706 = 3UC 166-001823 = 2MASS J00372194-0714101 = USNO-B1.0 0827-0008660 0 37 21.94 -07 14 10.2 (J2000, 2MASS) --- B comp = USNO-B1.0 0827-0008665 source rho theta epoch USNO-A2.0 35.94 49.5 1951.599 GSC-2.3 35.97 49.5 1989.827 2MASS 35.97 49.9 1998.827 DENIS 35.95 49.9 1999.852 USNO-B1.0 35.88 49.5 2000.0 CMC14 36.14 49.5 2003.827 n=2 --- V = 14.8 + 17.9 (GSC-2.3 b+r/2) --- 2MASS colors for the B comp are consistent with an M dwarf, in which case the primary must be a cool degenerate =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Coords for WDS 23285-2306 = LDS 6399 Date: Fri, 23 Apr 2010 21:19:13 -0700 This faint pair is GD 1575 + 1576. The WDS position is approximate, and about 1' off. Modern catalogues don't do very well by it (close, faint), but the primary is: 2MASS J23283131-2304567 at: 23 28 31.32 -23 04 56.7 (J2000, 2MASS). Luyten's position angle needs to be flipped 180 deg. An estimate from the 2MASS J image is: 4".9 in pa 222, epoch 1998.515. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 1088 cool companion Date: Sat, 01 May 2010 14:40:35 -0700 More of the Lowell GD stars are turning out to be F/G dwarfs and subdwarfs than I thought originally. As such they are rather more distant, and so there aren't many doubles. Finally caught one, however, which turns out to have been noticed from 2MASS color previously. GD 1088 A = MCT 0130-1937 = UCAC2 24259871 = SDSS J013239.35-192140.7 1 32 39.35 -19 21 40.4 (J2000, UCAC2) --- GD 1088 B = 2MASS J01323935-1921394 --- separation 1".0 in pa 189 (UCAC2 for primary minus 2MASS for secondary, both maybe slightly skewed by crowding) 1".1 in pa 180 (estimates from SDSS i and z images, nominally epoch 1995.1218) --- V = 15.7 + 19? (SDSS g+r/2 for primary, estimate for secondary; secondary somewhat fainter at i, distinctly brighter at z) --- spectral type given as a PG 1159 star (pre-white dwarf), also as DO.5 in McCook WD catalogue; given as DOQZ1 (the type-name for PG 1159 stars) by Wesemael et al in their WD spectral atlas (1993PASP..105..761W); the companion has to be an M dwarf --- cool companion noticed by Wachter (2003ApJ...586.1356W) --- apparently no associated planetary nebula =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 20568-0449 = LDS 6420 observations Date: Sun, 02 May 2010 15:14:05 -0700 source rho theta epoch USNO-A2.0 13.80 314.7 1953.628 2MASS 14.65 310.4 1998.717 CMC14 14.78 309.9 2003.181 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Faint pair UCAC2 25230127 Date: Sun, 02 May 2010 22:06:23 -0700 This marginal case lies near GD 1178, but is not related to it. UCAC2 25230127 = 2MASS J23322908-1741360 23 32 29.10 -17 41 36.0 (J2000, UCAC2) --- separation 2".1 in pa 222, epoch 1998.474 (estimates from 2MASS J and K images via SkyView) --- 14.3 + 16.3 (GSC-2.3 b+r/2 taken as V, estimated delta-m = 2) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: GD 1401 is cpm pair Date: Sun, 09 May 2010 20:45:47 -0700 This one is oval on DSS images, and also noticeable from the visible and near-IR catalogues showing a slight position offset. Though the companion has been recognized from the Balmer emission some time back per the SIMBAD biblio, it looks as though it wasn't resolved with actual measurement specs until recently. Farihi et al (2006ApJ...646..480F) give 2".295 in pa 154.11 from HST images. Looks as though other pairs from this paper are missing from the WDS as well. The pair are nearly equal in the visible, and the ASAS-3 combined V = 14.4. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-24 638 cpm companion Date: Thu, 13 May 2010 21:09:03 -0700 UCAC2 and NOMAD seem to agree (I think based on a somewhat different astrometric mix) that this star has a common motion companion. PPMX also gives similar motion. CD-24 638 A = TYC 6426-1055-1 = UCAC2 21908500 = 2MASS J01290758-2410240 1 29 07.59 -24 10 24.1 (J2000, UCAC2) CD-24 638 B = UCAC2 21908499 --- separation 20".11 in pa 249.3, epoch 2004.652 (CMC14, n=2) 20".12 in pa 249.3, epoch 2000.000 (UCAC2) 20".10 in pa 249.3, epoch 1998.823 (2MASS) 20".20 in pa 250.7, epoch 1987.372 (USNO-A2.0) --- the GSC plates from epoch ~1983 seem to have a problem in the position for the bright star, which might be messing up the A2.0 position a bit, too; astrom from the POSS-I plates not available in this area --- V = 11.0 + 13.8 (ASAS-3 V for primary, GSC-2.3 V for secondary, the latter consistent with CMC14 delta-r etc) --- third star ~27" NW = GD 1462 (V ~15.2) is optical I've been distracted from the GD list by some observing etc. We're also having a round of candidates for tenure-track jobs visiting, which is another minor disruption. Being at the bottom of the totem pole, I'm not involved in the interview process, though I do want to find out if these are people I might be able to work for. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 05124+4248 = J1253 ID error Date: Sun, 23 May 2010 00:40:13 -0700 This pair is not BD+42 1199 but instead the observations belong to the star ~1' W. Obvious on DSS/2MASS images. WDS 5124+4248 = GSC 2904-0257 = LF 7 +42 379 = 2MASS J05122236+4248080 = UCAC2 46536688 5 12 22.51 +42 48 08.2 (J2000, UCAC2) --- combined V = 11.4 (TASS MkIV) --- combined spectral type G5 (1958ApJS....4....1M) --- UCAC3 a bit of a muddle, WDS mags will need downward adjustment =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Putney 2 Date: Sun, 23 May 2010 22:12:14 -0700 This pair was reported by Angela Putney in what reads like a thesis paper (1997ApJS..112..527P) concerning white dwarfs. Putney 2 = GSC 3337-0193 = 3UC 281-068158 = 2MASS J04230990+5007431 4 23 09.90 +50 07 43.1 (J2000, 2MASS) --- separation 4".01 in pa 143.7, epoch --- V = 12.6 + 13.2, assumes UCAC3 delta-mag and combined V = 12.1 from TASS MkIV, which happens to match UCAC3 individual magnitudes within errors --- UCAC3 "5,6" double, but 'radial' motion for the secondary --- spectral type 'late A or early F' (1997ApJS..112..527P, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CLS 11A,B cpm pair Date: Wed, 02 Jun 2010 14:30:15 -0700 This pair was reported by Sanduleak & Pesch in 1988ApJS...66..387S. Comparison of POSS-I with later images shows they have common motion. They are listed as a "5,6" pair in UCAC3. CLS 11A = 2MASS J09163295+3020402 = SDSS J091632.98+302040.2 9 16 32.99 +30 20 40.3 (J2000, SDSS DR7) CLS 11B = 2MASS J09163332+3020409 = SDSS J091633.34+302041.0 --- separation 4".74 in pa 81.1, epoch 2003.3159 (SDSS DR7) 4".80 in pa 82.1, epoch 1998.214 (2MASS) --- V = 15.2 + 15.8 (SDSS g+r/2) --- spectral types M5 or later (1988ApJS...66..387S) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CLS 15A,B cpm? pair Date: Wed, 02 Jun 2010 15:02:30 -0700 Another pair reported by Sanduleak & Pesch in 1988ApJS...66..387S. I can't quite tell for sure whether they have common motion. There is some shift wrt a galaxy a few arcsec east, but the motion is small. It is consistent however with the motion shown for the primary in UCAC3 and SDSS DR7 (though they differ by 2x in RA motion). CLS 15 A = 2MASS J09442815+3255237 = SDSS J094428.15+325523.8 9 44 28.16 +32 55 23.8 (J2000, SDSS DR7) CLS 15 B = 2MASS J09442859+3255230 = SDSS J094428.58+325523.0 --- separation 5".48 in pa 99.4, epoch 2003.7 (SDSS DR7, n=2) 5".59 in pa 97.4, epoch 1998.181 (2MASS) --- V = 16.3 + 18.4 (SDSS g+r/2) --- spectral type M5 or later (1988ApJS...66..387S, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CLS 33AB cpm? pair Date: Wed, 02 Jun 2010 22:10:55 -0700 This is another pair reported by Sanduleak & Pesch in 1988ApJS...66..387S. The two stars are not obviously _optical_, but motions are small. The northeast component is significantly brighter in the near-IR, so doesn't seem faint enough in the visible to fit the usual delta-mag/absolute-mag relation. CLS 33A = 2MASS J11012923+3118407 = SDSS J110129.23+311840.6 11 01 29.24 +31 18 40.7 (J2000, SDSS DR7) CLS 33B = 2MASS J11012965+3118427 = SDSS J110129.64+311842.6 --- separation 5".69 in pa 69.3, epoch 2004.3674 (SDSS DR7) --- V = 17.4 + 17.6 (SDSS g+r/2) --- both type M5 or later (1988ApJS...66..387S) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CLS 41AB cpm? pair Date: Wed, 02 Jun 2010 22:50:43 -0700 Another ambiguous case from the Sanduleak & Pesch list (1988ApJS...66..387S). CLS 41 A = 2MASS J11365443+3408061 = SDSS J113654.40+340806.3 = UCAC2 43792469 11 36 54.41 +34 08 06.3 (J2000, SDSS DR7) CLS 41 B = 2MASS J11365389+3408048 = SDSS J113653.86+340804.9 --- separation 6".87 in pa 259.1, epoch 2004.2910 (SDSS DR7) --- V = 15.9 + 18.3 (SDSS g+r/2) --- spectral type M5 or later (1988ApJS...66..387S, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CLS 62AB cpm? trio Date: Thu, 03 Jun 2010 12:23:02 -0700 Another one from the Sanduleak & Pesch survey paper (1988ApJS...66..387S). USNO-B1.0 and SDSS show fairly similar motions for the two stars, so they could be related. Various red images show a third star close to the northern component, which is much redder and seems likely to be physical. I'll call this 'C' below. The USNO-A2.0 positions for AB might be affected by flaws on the plates (per DSS images), which makes the physical link uncertain. CLS 62 A = 2MASS J12540176+3243005 = SDSS J125401.77+324300.7 12 54 01.781 +32 43 00.8 (J2000, SDSS DR7) CLS 62 B = 2MASS J12540177+3242461 = SDSS J125401.77+324246.1 CLS 62 C = SDSS J125401.71+324258.9 --- separation AB: 14".53 in pa 179.8, epoch 2004.3622 (SDSS DR7) 14".47 in pa 179.3, epoch 1989.242 (GSC-2.3) 15".05 in pa 179.0, epoch 1950.364 (USNO-A2.0) AC: 1".87 in pa 203.7, epoch 2004.3622 (SDSS DR7) --- V = 17.3 + 17.4 + 22. ? (SDSS g+r/2, but pretty much an upper limit on the g mag for comp C, so may be brighter) --- spectral types M5 or later for A and B (1988ApJS...66..387S) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CLS 77AB cpm pair Date: Thu, 03 Jun 2010 13:47:00 -0700 Another Sanduleak & Pesch pair from 1988ApJS...66..387S. This one has obvious common motion. CLS 77A = 2MASS J14104528+3641497 = SDSS J141045.36+364149.6 14 10 45.38 +36 41 49.6 (J2000, SDSS DR7) CLS 77B = SDSS J141045.11+364149.9 --- separation 2".97 in pa 277.0, epoch 2003.3164 (SDSS DR7) --- V = 14.2 + 15.9, assumes SDSS delta-mag = 1.7 and TASS MkIV combined V = 13.9 --- USNO-B1.0 and SDSS motion for primary looks about right, UCAC3 motion has wrong sign in RA --- spectral types M5 or later (1988ApJS...66..387S) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CLS 101AB pair Date: Thu, 03 Jun 2010 15:16:00 -0700 This is another ambiguous-motion pair from the Sanduleak & Pesch list (1988ApJS...66..387S). CLS 101 B = 2MASS J16264864+3148026 = SDSS J162648.64+314802.6 16 26 48.64 +31 48 02.7 (J2000, SDSS DR7) --- this is the brighter component CLS 101 A = 2MASS J16264825+3148009 = SDSS J162648.25+314800.9 --- separation 5".29 in pa 251.0, epoch 2003.4065 (SDSS DR7) 5".29 in pa 250.9, epoch 1998.257 (2MASS) --- V = 16.2 + 16.6 (SDSS g+r/2) --- spectral types both M5 or later (1988ApJS...66..387S) From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: CLS 101AB pair (bis) Date: Thu, 03 Jun 2010 15:18:47 -0700 ...looks like the GSC-2.3 astrometry is okay as well: > --- separation 5".29 in pa 251.0, epoch 2003.4065 (SDSS DR7) > 5".29 in pa 250.9, epoch 1998.257 (2MASS) 5".30 in pa 250.0, epoch 1989.349 (GSC-2.3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06445-2834 = LDS 848 observations Date: Thu, 03 Jun 2010 22:38:15 -0700 The primary of this pair is CD-28 3358 (not 3361 per Luyten etc) and is also CPD-28 1428. The Tycho-2 and UCAC2 motion is somewhat smaller than shown in the WDS. More recent astrometry: source rho theta epoch GSC v1.2 16.25 72.7 1978.917 GSC-ACT 16.04 72.9 1978.917 DENIS 15.98 73.3 1999.055 2MASS 15.96 73.1 1999.058 UCAC3 15.89 73.0 2000.0 (provenance for secondary?) Due to the early ID error, SIMBAD has this all screwed up, so there'll be a note to them after this. From: Brian Skiff Reply-To: bas@lowell.edu To: question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr, george.mccook@villanova.edu Subject: ID error for LP 895-41 and bright companion Date: Thu, 03 Jun 2010 23:15:59 -0700 Due to an error in the CD name by Luyten for this common-motion pair, SIMBAD is mixed-up. Luyten gave the ID of the bright star as CD-28 3361, but it is actually CD-28 3358. This error was followed by Oswalt et al in 1988ApJS...66..391O, and perhaps elsewhere. In SIMBAD the faint WD companion has been incorrectly assigned to this designation. The 2008 WD catalogue also has the error. The Oswalt paper just cited (which includes Luyten as co-author) provides a chart for the pair, so the identification is unambiguous. CD-28 3361 = TYC 6533-1136-1 = UCAC2 19829813 (not CCDM J06446-2836A = IDS 06406-2828 A = LP 895-41 = WD 0642-285 = WD 0642-28) 6 44 34.83 -28 35 43.2 (J2000, UCAC2) --- V = 12.06 (Geneva photometry, which applies to this star, not to the motion pair; ASAS-3 mean V = 12.07) --- Geneva and 2MASS colors suggest mid-A/early-F star, not K dwarf --- all biblio, radial velocity, proper motion etc belong to LP 895-41 (see below) CD-28 3358 = CPD-28 1428 = CCDM J06446-2836A = IDS 06406-2828 A = TYC 6533-0994-1 = UCAC2 19829786 6 44 27.57 -28 32 42.6 (J2000, UCAC2) --- V = 10.62 +/- 0.03 (ASAS-3) --- spectral type K3V (1988ApJS...66..391O) LP 895-41 = WD 0642-285 = WD 0642-28 = 3UC 123-029571 = ** LDS 848B = IDS 06406-2828 B = CCDM J06446-2836B = 2MASS J06442874-2832380 = DENIS J064428.7-283238 6 44 28.73 -28 32 38.0 (J2000, UCAC3) --- provenance of UCAC3 astrometry is uncertain, but motion looks okay --- V = 16.8 (GSC-2.3 b+r/2) --- spectral type DA5+ (1988ApJS...66..391O); others may be published as well The WDS shows only Luyten's 1933 observation for the pair; I have submitted several more recent astrometric observations to Brian Mason. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr, bdm@usno.navy.mil Subject: LDS 235 AB etc mix-up Date: Fri, 04 Jun 2010 14:32:27 -0700 This mix-up involves two known pairs in the same field which are garbled in both SIMBAD and the WDS. BD-18 2482 = WDS 08477-1856 = J 2647 = TYC 6020-1841-1 = 2MASS J08473294-1857466 8 47 32.94 -18 57 46.7 (J2000, 2MASS) --- WDS has the pair misattributed to another (single) star elsewhere in the field --- the Dommanget CCDM assigns this pair incorrectly to LDS 235 --- notice early AC astrometry for this pair; UCAC3 shows this as a "5,6" double, but the proper motion for the fainter component is 'radial' (i.e. spurious) --- SIMBAD has a bogus entry called CD-18 2492 assigned to the mag 15 white dwarf (see below), which of course is wrong both since the CD has a northern limit of -22 Dec, and doesn't go nearly faint enough to record the WD star The other pair in a wider common-motion pair of disparate magnitudes: LDS 235 A (etc, but not BD-18 2482) = NLTT 20261 = UCAC2 24576245 = TYC 6020-1448-1 = 2MASS 08473125-1859335 8 47 31.24 -18 59 33.5 (J2000, UCAC2) --- two entries in SIMBAD, one with the wrong position LDS 235B (etc, but not CD-18 2482) --- okay in SIMBAD apart from erroneous CD name =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LDS 1406 B is optical + new Date: Fri, 04 Jun 2010 17:06:51 -0700 This pair seems to be an optical one. I was able to reproduce the 1963 Luyten offset (24"; 158deg) approximately using USNO-A2.0 (where it is roughly 24".8 in pa 160). Looking at later images, however, there's no motion for the secondary star. BUT --- the SDSS and 2MASS images show a faint, very red companion apparently with common motion that lies about 12" west: HD 124066 AC: separation 12".58 in pa 274.3, epoch 2000.126 (2MASS) 12".65 in pa 272.9, epoch 2005.3643 (SDSS DR7) --- both astrometric datasets are problematic due to the relatively very bright primary; the annual motion of the primary is 0".11, so the fixed position with a 5-year baseline looks suggestive if not utterly convincing --- V = 8.3 + 25. ? (published V for primary, rough limit via SDSS for secondary; Sloan i' = 20.0 and z' = 15.0) --- if it is physically connected, the companion has absolute Mv ~20, so it is well into the brown dwarf category. the Hip2 parallax puts it at around 60pc, so not really exciting. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 14263-1543 = LDS 5817 observations Date: Fri, 04 Jun 2010 23:07:36 -0700 Oswalt et al (including Luyten) in 1988ApJS...66..391O suggest this pair is not a physical one. Indeed their spectral types seem to exclude that. The various published proper motions are merely similar, but not compelling. However, looking at straight sep/pa, I find: source rho theta epoch USNO-A2.0 558.8 26.4 1956.270 GSC-2.3 558.6 26.4 1993.392 2MASS 558.6 26.4 1999.298 UCAC2/3 558.5 26.4 2000.0 CMC14 558.6 26.4 2003.446 Oswalt et al give the types as F7V + F4V. Could still be a chance alignment I suppose. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 16270-5412 = LDS 559 comment Date: Sat, 05 Jun 2010 19:48:42 -0700 I wonder if it is worth noting that the original Luyten position angle started out (presumably) as "north-following", which got made into pa 45 in the SDS/IDS/WDS, but which is actually surely essentially fixed at pa 6. Showing pa45 in the WDS for the early measure is misleading, que no? Oswalt et al in 1988ApJS...66..391O give the spectral types as M1V and DA5+. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 23541-3317 = LDS 826 third comp Date: Sat, 05 Jun 2010 21:01:45 -0700 The WDS doesn't seem to know yet about the faint third component to this large-motion pair. It seems to have been known at least since 2001, but perhaps no specs reported anywhere. About the only reliable single-epoch offset I can find in VizieR is from GSC-2.3: LDS 826 BC: 102".52 in pa 90.1, epoch 1996.609 ...where I'm taking 'B' to be the brighter northern M-type component of the well-known pair. V mag ~21 or 22. This component is also 2MASS J23540928-3316266 = DENIS J235409.2-331627. Spectral types given as: M8.5Ve 2004MNRAS.347..685S M8.5e 2005A&A...440.1061L M9 2008AJ....136.1290R The WDS has a flag saying the ID for the brighter AB pair is uncertain, but what's there is correct modulo proper motion. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: DO 306 is cpm pair Date: Sat, 12 Jun 2010 14:12:42 -0700 This is a star from the old Dearborn red stars catalogue that appears to be a common-motion pair. The Dearborn type is K5, which normally I'd shift to K2 due to this catalogue's systematic error. But I suspect the duplicity caused the spectrum to look redder than it actually is --- the 2MASS colors suggest a ~G0 dwarf for the primary. UCAC3 has them resolved as a 5,6 pair, but the proper motion of the primary is spuriously 'radial'. The UCAC2 motion looks about right. DO 306 A = UCAC2 35508758 = 2MASS J01495163+1055546 1 49 51.64 +10 55 54.9 (J2000, UCAC2) DO 306 B = 2MASS J01495176+1055598 --- separation 5".50 in pa 21.0, epoch 2000.720 (2MASS) --- V = 11.7 + 13.1 (assumes UCAC3/CMC14 delta-mag and combined V = 11.50 from ASAS-3, which happen to nearly match UCAC3 and CMC14 magnitudes directly) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, stauffer@ipac.caltech.edu, thenry@chara.gsu.edu Subject: GJ 4224 cpm pair Date: Mon, 14 Jun 2010 21:51:45 -0700 On tonight's astro-ph is a paper by Stauffer et al presenting coordinates for nearly all the Gliese stars: http://arxiv.org/abs/1006.2441 Accurate Coordinates and 2MASS Cross-IDs for (Almost) All Gliese Catalog Stars They mention what seems to be a new companion for the southern star GJ 4224, but give no details. These are estimated below from the 2MASS J image via the Goddard SkyView utility. Stauffer et al note that the pair was apparently recognized visually by Donna Weistrop (1980AJ.....85..738W). That Reyle et al observed the spectral types separately indicates the pair has been noticed at other times as well. CD-42 15640 A = GJ 4224 = TYC 7989-1091-1 = UCAC3 097-412323 = 2MASS J21491134-4133295 = IRAS F21460-4147 21 49 11.32 -41 33 28.9 (J2000, UCAC3) --- separation 2".8 in pa 151 (estimate via UCAC3 coords for primary and 2MASS J image estimate for secondary, ignoring the slight difference to epoch 1999.5 for the latter) --- V = 12.0 + 12.7, assumes UCAC3 delta-mag and combined V = 11.51 (published UBVRI, Geneva 7-color, ASAS-3) --- spectral types M0 + M0 (2006MNRAS.373..705R) --- Hip2 parallax = 48.9 + 28.2(!) mas --- kinda faint to expect the Hipparcos parallax to be any good --- 2MASS coords are for the photocenter; UCAC3 has two entries lacking proper motion for the companion, though the position for the primary is surprisingly correct; not resolved in other catalogues shown in VizieR In reading this paper, it was interesting to see that what I think of as rather primitive star-cataloguing techniques I've stumbled upon for building my large file are basically the same as those used by smart folks with a lot of resources. Alas, there's no automating much of this work! =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 07114-0130 = Bal 437 comment Date: Thu, 17 Jun 2010 23:37:36 -0700 This is an unconfirmed AC pair that seems to be real, though no recent observations are readily available via VizieR. It may be worth noting that the brighter component (even in the blue) is the red variable BW Mon. It was classified as spectral type M1 in the early Dearborn survey, but M5: by Jack MacConnell. The strong variability and very bright 2MASS magnitudes suggest the latter is more nearly correct. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 240917 cpm(?) pair Date: Tue, 22 Jun 2010 13:08:23 -0700 I can't quite show from catalogue stuff alone that this is a common-motion pair, but it looks convincing from images and the near-identical star magnitudes/colors. HD 240917 A = TYC 0698-0084-1 = UCAC2 34965778 5 07 45.75 +09 04 18.2 (J2000, UCAC2) --- separation 17".79 in pa 199.0, epoch 2000.00 (UCAC2) 17".76 in pa 199.0, epoch 1983.89 (GSC-ACT, n=4) --- V = 12.2 + 12.5 (assumes UCAC3 delta-mag and ASAS-3 combined V = 11.53 --- spectral type K7 (HDE, probably for combined light) --- colors/motion imply these are dwarfs ~k5v =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 241166/65 cpm(?) pair Date: Tue, 22 Jun 2010 13:28:24 -0700 Another wide pair with slow motion but near-identical magnitudes and spectral types. HD 241166 = TYC 2389-1381-1 = UCAC2 42891526 5 10 31.42 +31 39 28.7 (J2000, UCAC2) HD 241165 = TYC 2389-1275-1 = UCAC2 42891532 --- separation 45".06 in pa 26.9, epoch 2000.00 (UCAC2) 44".99 in pa 27.0, epoch 1910.466 (AC2000) --- V = 11.2 + 11.2 (TASS MkIV) --- spectral types A2 + A0 (HDE, 1931AnHar.100...61C) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 241457 cpm(?) pair Date: Tue, 22 Jun 2010 13:48:01 -0700 I flagged this as a likely cpm pair while going over this chunk of the HDE. But the motion is small, so it's merely presumed. UCAC3 has three entries, one of which has substantial motion that is not evident in images. UCAC2 has the same problem for its single entry, presumably from some shift in the photo-center. 2MASS is not helpful here. The UCAC3 astrometry is probably okay as a placeholder: HD 241457 A = TYC 0107-1480-1 = UCAC3 191-020970 5 11 29.47 +05 27 15.4 (J2000, UCAC3) --- 2".36 in pa 227.7, epoch 2000.11 (UCAC3) --- V = 11.4 + 12.2 (assumes UCAC3 delta-mag [a little large?] and ASAS-3 combined V = 11.0) --- spectral type K0 (HDE, 1931AnHar.100...61C) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 241610 in cpm pair Date: Tue, 22 Jun 2010 14:10:42 -0700 This one is much more certain. HD 241610 A = BD+03 805 = TYC 0103-1799-1 = UCAC2 32820468 --- separation 39".36 in pa 208.6, epoch 2000.00 (UCAC2) 39".25 in pa 208.6, epoch 1910.102 (AC2000) --- V = 11.4 + 12.3 (ASAS-3) --- spectral type F0 (HDE, 1931AnHar.100...61C, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 08465+0419 = STF 1267 comment Date: Tue, 22 Jun 2010 23:49:15 -0700 The WDS shows recent (2004) separation for this pair as 10".9. But similarly-recent independent astrometric catalogues put it at around 8". To wit: source rho theta epoch UCAC3 8".09 63.2 2000.00 (2000.19 for secondary) 2MASS 8".07 62.6 2000.175 ...using the UCAC3 position for the primary, CMC14 gives an offset of 7".98. A complete look at VizieR shows the 2006 Wycoff et al paper with three observations (AC + 2MASS) in the 8" range. Was Struve's 1830 measurement that poor, and the 2004 observation also off? From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Re: WDS 08465+0419 = STF 1267 comment Date: Wed, 30 Jun 2010 11:32:43 -0700 It was my mistake for assuming that anything from 1830 had to come from Struve! > Oddly enough, we don't have the first measure from Struve. His was not a > compiled catalog and all known pairs at that time got an "STF" number, > so it is possible that he didn't make one. Are you suggesting that if I look in our copy of the 'Mensurae Micrometricae' for STF 1267, it might not be there? > The full data pull on this pair is attached. How far are we from having these data more readily available with a link from VizieR? I see that Francois Ochsenbein added some bibcodes for the references, which is something I could help with if desired. From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Re: WDS 08465+0419 = STF 1267 comment Date: Wed, 30 Jun 2010 13:09:12 -0700 On Wed, 2010-06-30 at 10:42 -0400, Brian D. Mason wrote: > The full data pull on this pair is attached. > > Oddly enough, we don't have the first measure from Struve. His was not a > compiled catalog and all known pairs at that time got an "STF" number, > so it is possible that he didn't make one. I got into our vault to look at the Struve volume, and he shows STF 1267 only in the index in the back as 'rej', so evidently he didn't measure it himself. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+10 2284 cpm pair Date: Wed, 23 Jun 2010 16:55:20 -0700 These seem to have common proper motion, mainly on evidence of the near-fixed relative position between the AC and recent stuff despite several arcsec motion on the sky. They are nearly equal in brightness and color. They are a "5,6" pair in UCAC3; the PPMX shows them with common motion. BD+10 2284 A = 3UC 201-119842 = 2MASS J11253179+1004280 11 25 31.78 +10 04 28.1 (J2000, UCAC3) BD+10 2284 B = 3UC 201-119841 = 2MASS J11253167+1004210 --- separation 7".26 in pa 194.1, epoch 2000.00 (UCAC3) 7".18 in pa 194.3, epoch 2000.164 (2MASS) 7".21 in pa 194.1, epoch 2000.879 (CMC14, n=3) 7".45 in pa 191.1, epoch 1912.411 (AC2000) --- V = 11.0 + 11.2, assumes CMC14 delta-mag and ASAS-3 combined V = 10.29 --- spectral type K5 (1947AnDea...5....1L, combined type), which looks okay if these are dwarfs, as seems likely =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 19317+5300 comment Date: Wed, 30 Jun 2010 00:14:22 -0700 On Tuesday night's astro-ph is a paper with some data for Kepler stars: http://arxiv.org/abs/1006.5577 Characterization of Kepler early-type targets This contains some spectroscopy of some ~A0 stars that I'm adding to my file. Some of the types are wrong. Among the targets is HIP 96066 + 96061, which is Struve 2542 = WDS 19317+5300 AB. They show that the radial velocities are similar at least, and come to the startling conclusion that this is a physical pair. They give the spectral types as A1: + A3:, which appear to be correct. The WDS shows the type as G0, but this applies instead to HD 184424, about 2' NE, not to the double. The double is HD 184468, which the HD catalogue shows as type A0. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 44291 + CD-23 3720 cpm(?) pair Date: Sun, 11 Jul 2010 19:14:21 -0700 This wide pair seems to be fixed, though the motion is small. The delta-mag is consistent with the color difference if both stars are on the main sequence. HD 44291: 6 20 05.45 -23 06 19.2 (J2000, Tycho-2) --- companion = SD-23 96 = CD-23 3720 = CPD-23 1179 --- separation 51".75 in pa 39.1, epoch 1917.144 (AC2000) 51".86 in pa 39.3, epoch 1991.25 (Tycho-2 epoch) --- V = 7.9 + 9.8 (Tycho-2) --- spectral type A9V (Houk, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: 2MASS obs for WDS 06528-2315 AC Date: Sun, 11 Jul 2010 19:25:40 -0700 Looks as though the AB pair have significant motion, while C is fixed in the background. WDS 06528-2315 AC: 2".62 in pa 268.9, epoch 1999.068 (2MASS) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 19325+1026 = J2975 misidentified? Date: Sun, 18 Jul 2010 22:28:50 -0700 I'm pretty sure the intended star here is about 50" NE of the one given in the WDS. The WDS star is not double with the specs shown. The primary of the pair NE is UCAC2 35461570 at: 19 32 36.52 +10 26 11.6 (J2000). It is also a "5,6" pair in UCAC3. source rho theta epoch 2MASS 5".26 40.4 1999.550 CMC14 5".18 40.7 2001.468 The magnitudes will need to be adjusted to something like the UCAC3 values. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 19341-0025 = J2269 comment Date: Thu, 22 Jul 2010 12:26:18 -0700 This pair is rather fainter than advertised. Combined V from TASS MkIII and IV and from ASAS-3 is V = 11.2, so the component magnitudes need to be run down about 2 mags. The pair is also DO 5894, which shows spectral type M0. This is certainly the combined type since the plates were taken in the yellow-red region, where the pair are nearly equal in brightness. The TASS V-I = 1.5 or so, which is consistent with an unreddened K5 giant, which is consistent with the usual systematic offset of the Dearborn types (about 1 MK step too late). =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+50 3041 and BD+51 2810 cpm pair Date: Thu, 22 Jul 2010 23:35:03 -0700 These two stars, which appear in adjacent BD zones despite their proximity, seem to have common motion per Tycho-2 and UCAC3. Colors are consistent with the spectral type and delta-mag. BD+50 3041 = TYC 3584-0656-1 = 3UC 283-159763 20 16 13.822 +51 25 49.5 (J2000, Tyc2/UCAC3) --- comp = BD+51 2810 --- separation 26".11 in pa 28.9, epoch 2000.361 (2MASS) 26".11 in pa 27.4, epoch 2000.0 (UCAC3) 25".96 in pa 25.1, epoch 1983.5 (GSC-ACT) 26".13 in pa 25.0, epoch 1900.249 (AC2000, n=2) --- V = 10.0 + 11.0 (Tycho-2) --- spectral type F8 (1939UppAn...1a...1V, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 203046 and cpm companion Date: Thu, 29 Jul 2010 00:21:19 -0700 These two stars seem to have very similar motion and colors consistent with their being a physical pair. HD 203046 = BD+51 3035 = TYC 3601-1053-1 21 17 50.98 +52 28 33.1 (J2000, Tycho-2) --- companion = TYC 3601-0775-1 --- separation 55".36 in pa 325.1, epoch 1900.925 (AC2000, n=3) 55".83 in pa 324.8, epoch 1991.25 (Tycho-2 at epoch) 55".89 in pa 324.6, epoch 1998.860 (2MASS) 55".90 in pa 324.7, epoch 2000.0 (UCAC3, taking mean of two obs for primary) --- about 4" sky-motion since 1900 --- V = 7.7 + 11.1 (Tycho-2) --- spectral type F2 (1939UppAn...1a...1V, primary only); the HD type of A3 is too early per colors; 2MASS J-K = 0.46 for secondary, consistent with late-G dwarf From: Brian Skiff Reply-To: bas@lowell.edu To: Brian Mason Subject: Re: HD 203046 and cpm companion Date: Mon, 02 Aug 2010 10:42:08 -0700 On Mon, 2010-08-02 at 10:09 -0400, Brian Mason wrote: > It looks a lot closer to ~305 deg to me. Is it a typo? Not typo, but adding the arctan complement-angles (or whatever that's called) incorrectly, so they need to be flipped around the 315 deg line. So the four values below should instead be: 304.9 305.2 305.4 305.3 > > --- separation 55".36 in pa 325.1, epoch 1900.925 (AC2000, n=3) > > 55".83 in pa 324.8, epoch 1991.25 (Tycho-2 at epoch) > > 55".89 in pa 324.6, epoch 1998.860 (2MASS) > > 55".90 in pa 324.7, epoch 2000.0 (UCAC3, taking > > =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06031+1248 coords error ? Date: Sun, 01 Aug 2010 00:05:47 -0700 Not sure of your protocol in such cases, but the close Barton trio is centered about 1'.2 north of the WDS position. The ABH 35 components do indeed seem to be referred to the brighter star at the WDS location. ABH 35 E is in fact Brt 1192 A. It seems the close trio and the wider ABH 35 components might be more clear if they had separate WDS entries. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09133-0219 A is double Date: Sun, 01 Aug 2010 23:22:16 -0700 ...at least what I'm interpreting as component A, viz. the K dwarf with modest proper motion that is now SW of the slightly brighter K giant. It is visible as an equal pair on 2MASS images, confirmed with SDSS u and z as well. It is single in the SDSS DR7 catalogue, but resolved in UCAC3, where there are three entries, two of which are flagged as code 6 "companions". They are dead equal on both SDSS u and z-band images (also 2MASS J), so I'm arbitrarily taking the companion to be in the first quadrant (UCAC3 has the NE component slightly brighter, but surely identical within its errors). Switch them if you prefer. Comparing SDSS coordinates via SkyView, I identify them in UCAC3 as given below. BD-01 2219 A = 3UC 176-109861 9 13 16.32 -02 18 44.2 (J2000, UCAC3) B comp = 3UC 176-109863 --- separation 2".39 in pa 55.3, epoch 2000 (roughly: UCAC3 shows 2000.13 for the primary, and nominal 2000.0 for the secondary via proper motion; the coordinates match the SDSS DR7 images pretty well) --- V = 11.6 + 11.6, assuming delta-mag = 0.0 and Abt & Corbally combined V = 10.86 --- spectral type K2V (2000ApJ...541..841A, already in WDS) --- given their image scale and the fact that they were actually doing astrometry, it's surprising Abt & Corbally did not notice this =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+52 2767 and cpm? companion Date: Mon, 09 Aug 2010 22:46:24 -0700 Though the primary is an unconfirmed close Tycho double star, the somewhat fainter companion about 20" south appears to have common motion per UCAC3, and also color just slightly redder, consistent with being a physical companion. Somewhat surprisingly, the fainter star is not in the AC. The UCAC3 coords/motion are probably preferred here since there are several intermediate catalogues included; Tycho-2 lacks a motion for the secondary. Here's what I can find from VizieR: BD+52 2767 = TYC 3950-0609-1 = 3UC 286-166350 20 38 24.75 +52 48 04.8 (J2000, UCAC3) B = TYC 3950-0071-1 = 3UC 286-166351 source rho theta epoch GSC v1.2 19.90 1.3 1983.516 (n=2) GSC-ACT 19.79 1.5 1983.516 (n=2) Tyc2 19.99 1.2 1992.25 UCAC3 19.96 1.4 2000.0 2MASS 19.93 1.5 2000.430 --- V = 10.5 + 11.7 (Tycho-2) --- spectral type F5 (1939UppAn...1a...1V, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+52 3004 wide cpm companion Date: Sun, 15 Aug 2010 13:50:41 -0700 This wide pair seems to show common motion, and the 2MASS J-K colors are consistent with it being physical. BD+52 3004 = TYC 3967-0215-1 = 3UC 286-182034 21 39 24.27 +52 55 12.7 (J2000, Tycho-2) --- B comp = TYC 3967-3291-1 = 3UC 286-182006 --- separation 13".93 in pa 267.4, epoch 1901.875 (AC2000, n=3) 13".88 in pa 266.3, epoch 2000.0 (UCAC3) 13".86 in pa 266.2, epoch 2000.449 (2MASS) --- V = 10.8 + 11.9 (Tycho-2) --- spectral type A5 (1939UppAn...1a...1V, primary only) --- in UCAC3 the primary is flagged as code '5' double component; both stars have intermediate-epoch Hamburg astrometry =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: USNO-A2.0 obs of WDS 21092+5421 = Lep 99 Date: Tue, 17 Aug 2010 19:41:01 -0700 Just to add an earlier epoch observation to this wide common- motion pair: separation 113".64 in pa 26.8, epoch 1952.710, from POSS-I via USNO-A2.0. The primary is HD 235451 = BD+53 2562. The HDE type is K7, which is about right if it is a dwarf (obviously so per the large motion); maybe closer to K5 per 2MASS color. The companion is then an early-M dwarf. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 21200+5436 = TDT 2908 third comp Date: Sun, 22 Aug 2010 00:42:16 -0700 The TDSC catalogue fails to notice that the similarly bright nearby star is a common-motion companion, obvious in Tycho-2 and UCAC3. TDT 2908 ABxC = BD+53 2602 = TYC 3957-1530-1 etc --- separation 31".69 in pa 298.2, epoch 1902.371 (AC2000) 31".59 in pa 298.5, epoch 1999.474 (2MASS) 31".58 in pa 298.6, epoch 2000.0 (UCAC3) --- V = 10.3 + 10.5 (Tycho-2 for ABxC) --- spectral types G0: + F5: (1939UppAn...1a...1V for AB + C) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10379+4407 B is double Date: Sun, 22 Aug 2010 13:07:29 -0700 Looking again at the Abt & Corbally trapezium paper, I note that the B component of WDS 10379+4407 = hj 2538 is a pair. Contrary to what A&C note, the trio have common proper motion, so are related. WDS 10379+4407 Bb: 10 37 57.51 +44 07 13.6 (J2000, SDSS DR7) --- separation 1".68 in pa 102.2, epoch 2003.06 (SDSS DR7, n=2) --- V = 12.3 + 15.0, adopting Abt & Corbally combined V and delta-mag from SDSS =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+30 2381 and 2380 Date: Sun, 22 Aug 2010 22:18:42 -0700 Happened to notice this in my large file on entries added some years ago. BD+30 2381 = UCAC2 42413720 = TYC 2535-0052-1 13 13 33.55 +30 12 36.8 (J2000, UCAC2) --- B comp = BD+30 2380 = TYC 2535-0102-1 = UCAC2 42413717 --- separation 123".42 in pa 281.1, epoch 2002.088 (CMC14, n=1) 123".45 in pa 281.1, epoch 2000.0 (UCAC2) 123".41 in pa 280.9, epoch 1982.384 (GSC-ACT) 123".40 in pa 281.3, epoch 1902.972 (AC2000) --- V = 11.27 + 11.79 (published V) --- spectral types G1V + G8 (1993AJ....106.2301G for primary, 1984ApJ...281L..41L for secondary) --- radial velocities: 10.52 km/s for primary (2006PASP..118.1656S); 4.41 km/s for secondary (1984ApJ...281L..41L), and which is an SB2, and velocity is systemic velocity...hmmm, the Pourbaix file shows v-naught = 3.6 km/s, so maybe there is/is not a heliocentric correction applied; SB9 catalogue says 14.345-day period....either way the CfA group velocities seem to imply the stars are not related despite the very good match in sep/pa over the 100-year astrometric baseline =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 13098-3531 = HDS 1841 observations Date: Sun, 22 Aug 2010 23:18:08 -0700 Despite their small formal error, the Hipparcos observations for this pair are significantly in error. source rho theta epoch AC2000 12.64 352.4 1914.0 n=3,2; slightly different mean epochs DENIS 12.25 352.3 1998.427 2MASS 12.17 352.6 1999.241 --- the Tycho-2 motion for the primary and UCAC3 motion for the secondary also nearly parallel motion --- Stock & Wroblewski (1972POAN....2...59S) call this a weak-lined M star, but probably the overlapping spectra led to this conclusion (numerous similar cases in the S&W catalogue); the primary does appear to be an M0 giant per 2MASS colors From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Re: WDS 13098-3531 = HDS 1841 observations Date: Mon, 23 Aug 2010 11:07:41 -0700 On Mon, 2010-08-23 at 08:04 -0400, Brian D. Mason wrote: > Others before this mail added. > > This one is odd. I've added your measures and zero weighted the others, > but it is a puzzle. Both Hipparcos and Tycho got approximately the same > value, but looking at various images with Aladin it is very apparent > that they are wrong. When I saw how wrong it was, I expected to find an > additional solution in the notes to Volume 10 of the Hipparcos > Catalogue, but there was nothing there. The HIP&TYC solution is really a > puzzle. I've noticed this sort of thing before in the Tycho-2 data, especially when there's a pair that has nominal specs such that it should be visible on ordinary DSS/2MASS images (few arcsecs), but there's no companion at all, or there's another star at some larger distance (~1'). I've read that these can result from two or more stars crossing the coded-mask apertures at the same time (either in the near field or from the two separated fields that were imaged simultaneously) in such a way that the software couldn't disentangle them. Another thing that seems to happen is that the Tycho position for a single star is simply wrong by 2"-5". Both these things happen a lot in the areas of bright open clusters such as NGC 3532 down south. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 18134-2302 lettering mix-up ? Date: Mon, 23 Aug 2010 13:38:25 -0700 The AB pair of this trio is given as pa 37, indicating that the southwestern component is 'A'. But then the AC pair is given as pa 126, which seems to indicate that the northernmost star (i.e. B of AB) is the A component. So which should be A? The Abt & Corbally photometry indicates the northern star is the brightest in both V and B, the latter of which is presumably more relevant for the AC-based Aravamudan listing. The star Abt & Corbally classified as type G9IIIa is clearly the northern star, from their own reckoning (they give the pa as 217 and color of a slightly reddened K giant), but also because the southwestern star is quite red (B-V = 1.93), evident also on various images, so is almost certainly a rather later type. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: francois@cdsarc.u-strasbg.fr, bdm@usno.navy.mil, abt@noao.edu, corbally@as.arizona.edu Subject: Coords for Trap 630 Date: Mon, 23 Aug 2010 14:28:47 -0700 There is a typo in the Declination coordinates for the object called Trap 630 in the Abt & Corbally trapezium paper (2000ApJ...541..841A). The on-line file shows the equinox 1900 position as: 18 27.6 -06 49. The Declination should instead be -08 49. The brightest of the star-group is BD-08 4628, and the system appears in the WDS with designation WDS 18331-0845 = hj 5498. Abt & Corbally's type for the primary star is B8III. After searching the same RA position at +06 Dec without success, I then looked at the Salukvadze trapezium catalogue in VizieR and found an entry with the same eq 1900 position, but at -08 Dec that matches the Abt & Corbally description. Salukvadze makes no link with the "mystical" Allen catalogue. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: francois@cdsarc.u-strasbg.fr Cc: bdm@usno.navy.mil, abt@noao.edu, corbally@as.arizona.edu Subject: Re: Coords for Trap 864 Date: Mon, 23 Aug 2010 20:33:17 -0700 This group has a similar problem as with Trap 630 sent previously. The group appears in the Abt & Corbally trapezium paper (2000ApJ...541..841A = J/ApJ/541/841 in VizieR) with a typo in the Declination. The equinox 1900 position is shown as: 21 41.7 29 49, but should be 21 41.7 27 49. The correction links the group with WDS 21462+2817 = Mlb 540, with precise coordinates for the primary: 21 46 00.73 +28 17 43.1 for J2000 from UCAC2. This ID appears to have already been made in the WDS. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 14378-6756 additional observations Date: Sun, 19 Sep 2010 13:05:41 -0700 This is a wide optical pair, with the primary moving fast toward the southwest. Perhaps because of lack of proper motion for the secondary, and relatively poor observations in recent surveys, there are no modern observations in the WDS. The secondary appears in AC2000, which should help tie things together. I note also that the two stars are HD 128020 (primary) and HD 127999 (secondary). source rho theta epoch AC2000 56".81 238.8 1895.0 N.B. slightly different mean epochs; large uncertainty on the primary presumably results from multiple epochs being averaged in AC2000, and not from measurement error --- perhaps you can parse them out Tycho-2 16".28 261.4 1991.25 HipTyc mean epoch DENIS 13".37 266.2 1999.0 mean of two dates =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LDS 842 coords, photometry Date: Fri, 08 Oct 2010 11:09:20 -0700 This one has an early-epoch (~1950?) position in the WDS, but which is readily identifiable on DSS and 2MASS images. WDS 04256-0651 = LDS 842 = LHS 189 + 190 = GSC 4733-0269 = USNO-B1.0 0831-0072069 = GSC2.3 S2AG013067 = 3UC 167-013814 = 2MASS J04253829-0652357 = DENIS J042538.3-065236 4 25 38.28 -06 52 36.8 (J2000, USNO-B1.0) 4 25 38.37 -06 52 37.0 (UCAC3, epoch 1999.99) 4 25 38.30 -06 52 36.9 (GSC-2.3, epoch 2000.003) ...photocenters probably weighted slightly differently between the three. UCAC3 shows the epoch position only; I'd take USNO-B1.0 for now, since it shows a correct proper motion as well (+656, -980 mas/year). No obvious relative motion since POSS-I, but the pair are near the resolution limit, so you really can't say much, and none of the recent catalogues has them resolved. Dawson & Forbes give BVRI photometry for the combined light: V = 14.238, B-V = 1.672, V-R = 1.106, R-I = 1.247, V-I = 2.353 If we assume the Luyten delta-mag of 0.6, this makes the components V = 14.7 and 15.3. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 10561 + CD-42 587 cpm pair Date: Sun, 24 Oct 2010 15:14:50 -0700 I noticed several catalogue-trawling lists of common-motion pairs that appeared recently. This may be among them, but isn't in the current copy of the WDS at VizieR. HD 10561 A: 1 42 02.99 -42 13 09.5 (J2000, UCAC2) B = CD-42 587 = TYC 7545-1208-1 = UCAC2 13686421 --- 47".53 in pa 2.5, epoch 2000.0 (UCAC2) 47".37 in pa 2.4, epoch 1900.436 (AC2000) --- V = 10.3 + 10.9 (1993A&AS...99..437D, CCD photometry) --- HD spectral type G0 is probably better than Houk's K0/2: + A/F: due to overlapping images; the Demers et al B-V values are 0.49 and 0.55, suggesting late-F dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: TYC 5281-0710-1 pair Date: Sun, 24 Oct 2010 18:44:03 -0700 Another pair noticed in the big Demers et al southern CCD photometric sequences papers. This is resolved as a "5,6" pair in UCAC, and it appears also in 2MASS. TYC 5281-0710-1 = UCAC2 27952196 = 3UC 159-005759 2 11 34.98 -10 49 08.6 (J2000, 2MASS) B comp = 3UC 159-005760 --- separation 4".57 in pa 76.1, epoch 2000.797 (2MASS) 4".54 in pa 75.6, epoch ~1999 (UCAC3) ...UCAC3 proper motion for primary, but not secondary, so there's a slight epoch difference between the two positions, not sure how you treat such cases. --- V = 11.59 + 12.27 (1993A&AS...99..437D); B-V = 0.64, 0.68 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 118558 cpm companion Date: Tue, 09 Nov 2010 12:12:58 -0700 This mainly confirms the UCAC3 "5,6" pair here, which I presume will end up in the WDS eventually. HD 118558 = BD+13 2692 = TYC 0899-0660-1 = UCAC2 36303387 --- B comp = UCAC2 36303384 --- separation 9".96 in pa 326.5, epoch 1907.3 (N.B. slight epoch difference for the two stars 10".15 in pa 327.0, epoch 2000.0 (UCAC2) --- UCAC2, UCAC3, and Bordeaux meridian circle show consistent and similar motions for the two stars --- probably combined V = 9.39, B-V = 0.33, U-B = -0.06 (Oja, 1985A&AS...61..331O); delta-mag ~2.5 - 2.7, so V ~12.0 for the secondary; 2MASS J-K color difference consistent with their being a physical pair (comp has G dwarf color) --- HD type F2 for primary only =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LP 920-40, overlooked pair Date: Fri, 19 Nov 2010 23:34:45 -0700 Perhaps because the identifications are a little mixed-up in the literature, this large-common-motion pair does not appear in the WDS. LP 920-40 A = [TBF80] 10B = 3UC 121-279675 = 2MASS J17192033-2949233 17 19 20.33 -29 49 23.3 (J2000, 2MASS) LP 920-40 B = [TBF80] 10A = 3UC 121-279655 = 2MASS J17191970-2949147 --- separation 11".80 in pa 316.4, epoch 1998.526 (2MASS) 11".79 in pa 316.6, epoch 1998.821 (DENIS) 11".80 in pa 316.5, epoch 2002.591 (CMC14, n=1) --- sorry no older measurements available in VizieR; the motion is more than 0".5 per year, so even the short baseline above is enough to show they're linked --- V = 14.13 + 14.64 (photoelectric UBV data, 1981A&AS...46...49T) --- UBV colors are of early-M dwarfs --- the pair were presumably noted by Luyten, but also recovered by Terzan in 1980CRB...290..321T, and more recently by Lepine in 2002AJ....124.1190L --- Lepine mentions third component, but this is clearly a zero-motion field star =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: NLTT 44585/6 cpm pair Date: Fri, 19 Nov 2010 23:55:13 -0700 Another case that seems to have been overlooked for no obvious reason. NLTT 44585 = [TBF80] 12A = 3UC 120-271987 = 2MASS J17201812-3011448 17 20 18.12 -30 11 44.8 (J2000, 2MASS) NLTT 44586 = [TBF80] 12A = 2MASS J17201841-3011515 --- separation 7".77 in pa 150.3, epoch 1998.605 (2MASS) 7".61 in pa 152.6, epoch 1998.824 (DENIS) 7".61 in pa 152.1, epoch 1999.553 (DENIS) --- V = 14.71 + 17.6 (primary is photoelectric V from Terzan 1981A&AS...46...49T; secondary mv from GSC-2.3) --- again presumably noted by Luyten, but also by Terzan in 1980CRB...290..321T, and more recently by Lepine in 2002AJ....124.1190L =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, thenry@chara.gsu.edu Subject: LP 920-69 is double Date: Sat, 20 Nov 2010 00:23:00 -0700 Looks as though this pair was missed by folks looking at the star as a nearby candidate. Aliases include Gliese 4013 = 2MASS J17380361-3000571. It is clearly elongated on the 2MASS images, from which I estimate: separation 2" in pa 15. Terzan (1981A&AS...46...49T) gives combined V = 10.94, B-V = 1.47, U-B = 1.22, consistent with the reported spectral type of K7. Reid et al (2004AJ....128..463R) give the distance modulus as 2.13 = 27 pc. From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: thenry@chara.gsu.edu Subject: Re: LP 920-69 is double Date: Sat, 20 Nov 2010 00:24:51 -0700 I neglected to mention that the pair are nearly equal in brightness on the 2MASS images. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, thenry@chara.gsu.edu, winters@chara.gsu.edu Subject: FBS 1542+493 is cpm pair Date: Thu, 25 Nov 2010 12:54:06 -0700 In the recent list of red stars from the Byurakan faint 'blue' stars survey (2010Ap.....53..123G), I notice that FBS 1542+493 is a nearly-equal small-proper-motion binary. Though only oval on DSS/2MASS images, they are clearly resolved in all SDSS images. The Gigoyan et al spectral type is M6/7, which may not be too late if the 2MASS colors are also correct. The combined brightness of the pair is about V = 14.5, perhaps slightly fainter, making each component about 15.5 reckoning conservatively. Even if they are type M5 (Mv ~14.7), then the pair are at only ~15pc. FBS 1542+493 = GSC 3486-0255 = 2MASS J15442922+4910284 = SDSS J154429.21+491028.5 15 44 29.22 +49 10 28.5 (J2000, 2MASS for photo-center) --- separation 1".5 in pa 28, epoch 2001.375 (SDSS estimates < 0".1 uncertainty from g,r, and z-band images via SkyView) --- V = 15.5 + 15.5, assumed equal --- 2MASS J-K = 0.96 --- proper motion is small but clearly visible between POSS-I and recent images (USNO-B1.0, UCAC3, or SDSS motions are okay) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-39 3486 is cpm pair Date: Sat, 27 Nov 2010 22:30:41 -0700 While checking a list of H-alpha emission stars, I matched against another list in the same area, and noticed an entry in that second list that I flagged as a likely moderate-proper-motion K dwarf. A quick look at DSS/2MASS images shows it is in fact a common-motion binary. This appears in UCAC3 as a "5,6" pair with an intervening spurious entry. CD-39 3486 = CPD-39 1570 = 3UC 102-040398 = 2MASS J07403792-3924582 = [M81] I-136 7 40 37.94 -39 24 58.1 (J2000, UCAC3) --- separation 8".17 in pa 32.0, epoch 2000.0 (UCAC3) 8".35 in pa 31.5, epoch 1999.112 (2MASS) 8".17 in pa 32.0, epoch 1999.945 (DENIS) ...2MASS almost certainly to be preferred --- V = 10.0 + 13.2, assuming ASAS-3 combined V = 9.95 and UCAC3 delta-mag --- modest proper motion (cf UCAC3) and 2MASS J-K = 0.47 + 0.80 suggest roughly K0 + K5 dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, question@simbad.u-strasbg.fr, arnaud.siebert@astro.unistra.fr Subject: Terz V 856 proper motion Date: Fri, 03 Dec 2010 21:19:41 -0700 Not sure that there is anything to be done here. This star was reported by Terzan (1988A&AS...76..205T) in a list of variable stars. But I'm pretty sure the star was _not_ intended to be noted as variable, but instead simply given to list it as having significant proper motion. Terzan's coordinates and chart are good enough. The star is present in UCAC3, but the motion there is incorrect, though coordinates are okay. It is flagged as part of a "5,6" double with a similarly-bright star about 3".5 southwest. This is an optical pair, however. Looking at the overlapping POSS-I scans from USNO-Flagstaff, I estimate the position at about epoch 1958 as 17 13 39.0 -29 12 59. Differencing with the 2MASS position (epoch 1998) gives total motion of about 7" in 40 years = ~0".175 per year in pa ~225, i.e. about -120 and -120 mas/year in RA/Dec, respectively. The 2MASS and DENIS colors are uncertain, but are consistent with an ordinary K dwarf. I see no moving companion nearby. Various IDs and coordinates are shown below. Terz V 856 = NSV 8333 = 3UC 122-268450 = 2MASS J17133868-2913046 = DENIS J171338.6-291304 17 13 38.68 -29 13 04.7 (J2000, 2MASS) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: css_fuors@Safe-mail.net Cc: terry.girard@yale.edu, bdm@usno.navy.mil, wih@usno.navy.mil, patrickwils@yahoo.com, varsao@hotmail.com, mmorel7@bigpond.com Subject: Re: rho Octantis has a common proper motion companion Date: Sun, 12 Dec 2010 11:25:09 -0700 Some rho/theta details about rho Oct extracted from VizieR: source rho theta epoch AC2000 65.70 152.6 1896.778 Yale zone 65.48 155.0 1956.24 Tycho-2 65.52 151.1 1991. (mean epoch 1990.9 for primary) 2MASS 65.88 152.7 2000.219 The values from the Yale zone catalogue are presumably in the FK3(?) system, so need to be rotated to the current reference frame... dunno how to do that. UCAC3 excludes Hipparcos/Tycho-2 from its solution for the primary, so has relatively low weight (nominal uncertainty is 270 mas, which simply can't be, given that it's been a 'Fundamental' star for a century). The delta-mag of about 5.0 is consistent with the various photometric colors, making the companion a dwarf near K0. It is interesting that the primary is evidently both an IRAS and an x-ray source. From: Brian Skiff Reply-To: bas@lowell.edu To: css_fuors@Safe-mail.net Cc: terry.girard@yale.edu, bdm@usno.navy.mil, wih@usno.navy.mil, patrickwils@yahoo.com, varsao@hotmail.com, mmorel7@bigpond.com Subject: Re: rho Octantis has a common proper motion companion Date: Sun, 12 Dec 2010 11:52:12 -0700 ...not enough coffee today... add 180 deg of course to all the position angles. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Additional astrometry for LDS 748 Date: Wed, 15 Dec 2010 20:43:56 -0700 This one seems to have only the early BPM measurement in the WDS. source rho theta epoch GSC-ACT 27.20 155.6 1974.635 UCAC3 27.54 155.8 1998.73 2MASS 27.43 156.0 1999.627 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WT doubles Date: Thu, 16 Dec 2010 16:52:34 -0700 I got distracted by the list of southern motion stars published by Wroblewski & Torres (1994A&AS..105..179W). As expected, about 5% of them are doubles, as outlined in the attached plain-text list. Some were obviously overlooked because they used blue plates (nearly all the primaries are K/M dwarfs), but others have small separation probably below their resolution limit. In a few cases W&T show both stars, but there are no comments in the paper about common-motion pairs. In other cases they have purposely not listed a known Luyten star, but give the common-motion companion without noting that they are linked. The relatively small epoch difference among the various digitized sky surveys and astrometric catalogues means there is not the usual range of measurements available in VizieR. I used Aladin in several cases to verify the motion via RGB overlays or blinking. (My first use of Aladin, which seems inconvenient for this sort of thing after all.) It is usually the case that GSC-2.3, USNO-B1.0, UCAC3, PPMXL etc are garbled to some degree, usually with mixed/missing proper motions, so usually data from these catalogues are passed over. The DENIS differential astrometry doesn't seem to be all that great either, though I do show it sometimes. (DENIS astrometry is linked to the GSC-2.x, so external errors a little soft, but it is disappointing that the differential coords are not any better.) A couple of the systems lie just outside the 25 parsec "nearby stars" radius, but there are no obviously noteworthy objects here. source list: 1994A&AS..105..179W WT 529 16 49 38.20 -58 40 57.0 (2MASS) 1".2 in pa 25, epoch 1999.575 (2MASS estimate) V = 14.9 + 15.9 (assumes delta-mag = 1.0 and UCAC3 mag as V) LTT 6751 + WT 531 16 57 20.18 -61 54 49.2 (2MASS) 12".07 in pa 4.7, epoch 2000.298 (2MASS) 12".03 in pa 4.6, epoch 1993.247 (GSC-2.3) V = 15.1 + 17.6 (GSC-2.3) --- omitted from USNO-A2.0 due to motion between blue/red plates WT 535 17 05 46.06 -63 25 14.4 (2MASS) 2".7 in pa 165, epoch 2000.342 (2MASS estimate) V = 15.9 + 17.9 (assumes delta-mag = 2.0 and UCAC3 as V) --- no obvious change in orientation between earliest DSS and 2MASS WT 574 18 39 03.83 -65 23 04.5 (2MASS) 6".84 in pa 69.8, epoch 2000.405 (2MASS) 6".89 in pa 70.7, epoch 1996.641 (DENIS) V = 10.6 + 15.5 (Tyc2, UCAC3 adjusted per Tyc2) --- this is L 113-10, which is not a CD or CPD star --- AC and Tyc2 astrom misattributed in UCAC3 --- no obvious change in orientation between earliest DSS and 2MASS LTT 7451 + WT 593 18 49 16.16 -53 53 52.6 (2MASS) 8".42 in pa 268.8, epoch 2000.649 (2MASS) 8".54 in pa 269.9, epoch 1991.668 (GSC-2.3) V = 15.5 + 16.5 (GSC-2.3 b+r/2) --- no obvious change in orientation between earliest DSS (1982.9) and 2MASS WT 608 + 609 18 57 33.23 -63 21 02.3 (2MASS) 24".52 in pa 8.6, epoch 2000.405 (2MASS) 24".50 in pa 8.7, epoch 1998.780 (DENIS) 24".54 in pa 8.2, epoch 1995.655 (GSC-2.3) 24".49 in pa 8.4, epoch 1979.889 (USNO-A2.0) V = 14.6 + 17.7 (GSC-2.3 b+r/2) WT 612 18 59 33.46 -55 29 09.5 (PPMXL) 7".18 in pa 105.0, epoch 1991.668 (GSC-2.3) V = 18. + 19. (estimates via GSC-2.3 and USNO-B1.0) --- too faint, so no other meas of both stars, but cpm obvious --- blue stars WT 616 19 01 29.93 -58 40 02.0 (2MASS) 21".25 in pa 16.5, epoch 2000.0 (USNO-B1.0) 21".34 in pa 18.2, epoch 1999.819 (2MASS) 21".34 in pa 18.2, epoch 1998.348 (DENIS) 21".26 in pa 17.1, epoch 1989.658 (GSC-2.3) V = 14.8 + 18.2 (GSC-2.3 b+r/2) WT 639 + 640 19 15 00.56 -62 38 35.1 (2MASS) 5".86 in pa 136.2, epoch 2000.764 (2MASS) 5".87 in pa 136.0, epoch 1996.654 (DENIS) V = 15.5 + 17.5 (estimates) HD 193307 + WT 703 20 21 41.04 -49 59 57.8 (Tycho-2) 21".27 in pa 299.4, epoch 1999.783 (2MASS) V = 6.27 + 12.8 (published V for primary, UCAC3 for comp) --- cf UCAC3 common motion --- link a little sketchy but seems likely WT 710 = NLTT 210- 28 20 28 20.05 -55 19 23.6 (2MASS) 1".8 in pa 332, epoch 2000.786 (est from 2MASS images) V = 14.8 + 16.8 (GSC-2.3 b+r/2 for combined light, estimated delta-mag) --- oval on DSS/2MASS images WT 730 + 729 20 45 14.92 -69 01 52.8 (2MASS) 41".85 in pa 245.2, epoch 2000.430 (2MASS) 42".02 in pa 244.8, epoch 1999.567 (DENIS) 41".97 in pa 244.9, epoch 1993.690 (GSC-2.3) V = 15.5 + 15.7 (UCAC3 mag taken as V) WT 767 + 768 21 01 21.06 -50 18 49.2 (2MASS) 12".83 in pa 158.0, epoch 1999.646 (2MASS) 12".80 in pa 15.79, epoch 1998.68 (UCAC3) V = 13.6 + 13.9 (ASAS-3 combined V, UCAC3 delta-mag) WT 813 21 47 16.46 -40 34 03.7 (2MASS) 7".64 in pa 247.3, epoch 1999.745 (DENIS) 7".58 in pa 247.0, epoch 1999.507 (2MASS) 7".84 in pa 247.5, epoch 1998.72 (UCAC3) V = 12.8 + 14.3 (ASAS-3 combined V, UCAC3 delta-mag) WT 823 + 824 21 51 52.05 -43 24 33.0 (2MASS) 5".66 in pa 32.1, epoch 1999.717 (2MASS) 5".55 in pa 31.6, epoch 1998.753 (DENIS, n=2) V = 15.5 + 15.5 (ASAS-3 combined V, delta-m = 0) WT 828 + 829 21 54 41.84 -48 32 05.9 (2MASS) 3".55 in pa 265.6, epoch 2000.602 (DENIS) 3".80 in pa 265.8, epoch 1999.715 (2MASS) 3".66 in pa 267.0, epoch 1998.68 (UCAC3) V = 17.0 + 17.5 (estimates) --- this is LDS 6366, additional measurements WT 858 22 01 58.14 -49 55 12.8 2MASS) 4".10 in pa 222.6, epoch 1999.715 (2MASS) V = 13.8 + 14.7 (ASAS-3 combined V, UCAC3 delta-mag) WT 940 22 31 58.32 -45 15 14.5 (2MASS) 6".12 in pa 178.7, epoch 1998.895 (2MASS) 6".11 in pa 177.9, epoch 1990.781 (GSC-2.3) V = 15.0 + 16.5 (ASAS-3 combined V, DENIS delta-I mag) WT 946 = CD-46 14373 = CPD-46 10424 22 37 22.21 -45 50 10.1 (UCAC2) 6".99 in pa 349.2, epoch 1998.898 (2MASS) V = 10.1 + 14.8 (ASAS-3 combined V, UCAC3 delta-mag) spectral type K3V (1972AJ.....77..486U, primary only) WT 966 = CD-43 15280 = CF 20232 23 09 39.46 -42 22 51.3 (2MASS) 9".29 in pa 115.1, epoch 1999.706 (2MASS) V = 10.8 + 15.2 (ASAS-3 combined V, UCAC3 delta-mag) spec K0 (Cape Faint) WT 968 23 10 32.01 -41 09 15.4 (2MASS) 8".72 in pa 89.8, epoch 1998.745 (DENIS) 8".73 in pa 85.4, epoch 1999.600 (2MASS) V = 13.2 + 15.7 (ASAS-3 combined V, UCAC3 delta-mag) WT 979 = HD 219630 23 17 38.02 -42 11 30.0 (UCAC2) 10".91 in pa 173.2, epoch 1999.706 (2MASS) V = 10.4 + 14.4 (published V for primary, estimated delta-mag) WT 995 + 996 23 28 52.43 -54 27 59.6 (2MASS) 15".86 in pa 140.8, epoch 1999.852 (2MASS) 15".87 in pa 140.8, epoch 1998.62 (UCAC3) 15".92 in pa 140.6, epoch 1996.616 (DENIS) V = 14.3 + 16.0 (UCAC3 taken as V) --- not related to nearby HD 221019 WT 1025 + 1024 23 45 57.69 -56 20 40.8 (2MASS) 8".29 in pa 277.6, epoch 1999.862 (2MASS) V = 14.4 + 14.6 (ASAS-3 combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jfaherty@amnh.org Subject: NLTT 20346 is cpm binary Date: Mon, 20 Dec 2010 21:41:07 -0700 Brian, In a paper in tonight's astro-ph listing, Faherty et al show that the Luyten star NLTT 20346 is a common-motion pair (http://arxiv.org/abs/1012.4232). Unless I skipped over it, the authors do not give accurate relative astrometry. A single observation is available in SDSS DR7: NLTT 20346 = UCAC2 35573092 = 2MASS J08501918+1056436 = SDSS J085019.06+105643.3 8 50 19.15 +10 56 43.7 (J2000, UCAC2) --- separation 1".88 in pa 130.7, epoch 1994.2572 (SDSS DR7) --- V = 16.0 + 18.4 (SDSS g+r/2) --- spectral types M5e + M6e (Faherty et al) The pair are oval on DSS1,2 and 2MASS images in the same orientation as the SDSS images, so they are obviously linked. The authors also argue that the pair have common motion with the L-dwarf system 2MASS J08503593+1057156 = WDS 08506+1057, about 4' away. This is not obvious to me. The proper motion of NLTT 20346 is given variously as: -172, -50 +/- 8,6 mas/year (Faherty et al) -179, -59 +/- 4,4 (UCAC2) -179, -52 +/-10,10 (LSPM) -175, -62 +/- 6,6 (Salim & Gould) (188 mas/year total motion per UCAC2) ...whereas for the L-dwarf system, the authors show: -144, -38 +/- 6,6 (Faherty et al) -143, -20 +/- 6,3 (Vrba 2004) -142, -8 +/- 2,2 (Dahn 2002) (149 mas/year total motion per Faherty) For reasons they describe, Faherty et al indicate that the motions from the USNO parallax-program are probably skewed, and their own determination is better. The total motion difference is nearly 40 mas/year, compared to uncertainties of ~5 mas/year. Despite this, the authors conclude from Monte Carlo tests that the odds of a chance coincidence is less than 1 percent (see their section 3.3). Even though the stars are probably at a similar distance, unless I am missing something, it seems the motions are too dissimilar for them to be related. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StM 185 is cpm pair Date: Wed, 22 Dec 2010 21:54:20 -0700 Looking over a list prepared a couple years ago, I noticed some common-motion pairs that seem not to be in the WDS. All involve fairly nearby M dwarfs from a list by Stephenson (1986ApJ...301..927S), which is supposed to include only giants, but in fact has a number of late-type dwarfs in it. The first of these is: StM 185 = 3UC 282-115602 = 2MASS J13350945+5039167 = SDSS J133509.59+503920.1 13 35 09.46 +50 39 16.8 (J2000, 2MASS) --- B comp = 3UC 282-115603, proper motion discordant --- separation 3".94 in pa 25.0, epoch 2000.183 (2MASS) --- V = 12.9 + 14.7 (TASS MkIV combined V, UCAC3 delta-mag) --- spectral type M8 (1986ApJ...301..927S, probably primary only, but apparently this is too late: V-K color suggests something more like M2 or M3) --- implied distance ~30 pc =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StM 219 is cpm pair Date: Wed, 22 Dec 2010 22:12:34 -0700 Here is the second of the Stephenson M-dwarf pairs. StM 219 = 3UC 299-109586 = 2MASS J15090808+5904258 = SDSS J150908.17+590425.6 --- B = 3UC 299-109585 --- separation 8".99 in pa 285.1, epoch 1999.277 (2MASS) --- V = 12.9 + 16.5 (TASS MkIV combined V, UCAC3 delta-mag) --- spectral types M7 (1986ApJ...301..927S, probably wrong) M2.5 + M4 (2006AJ....132..866R) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: StM 336 is a cpm pair Date: Wed, 22 Dec 2010 22:37:15 -0700 This is the last of the Stephenson stars that I've found to be a common-motion pair. This one is quite wide, so has earlier- epoch astrometry that clinches the link. StM 336 = 3UC 236-126229 = 2MASS J17102546+2758400 = SDSS J171025.45+275839.8 --- separation 48".11 in pa 128.8, epoch 2001.348 (CMC14, n=2) 47".99 in pa 128.9, epoch 1999.424 (2MASS) 48".20 in pa 128.8, epoch 1993.455 (GSC-2.3) 48".12 in pa 128.9, epoch 1950.383 (USNO-A2.0) --- V = 12.6 + 17.3 (ASAS-3 V for primary, CMC14 delta-mag) --- spectral types M6 (1986ApJ...301..927S, primary, wrong; probably more like M2 or M3) M5.5V (1994ApJS...94..749K, secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: ID error for WDS 14139-5803 Date: Tue, 28 Dec 2010 20:03:45 -0700 This is a "one night stand" (borrowing from asteroid discovery lingo...) that seems to have been misidentified. A search nearby on images suggest it is instead a star not far northeast. WDS 14139-5803 = Jsp 618 = CD-57 5472 = TYC 8686-0620-1 14 14 13.03 -58 00 35.8 (J2000, UCAC2) --- not CD-57 5471 --- combined V = 10.73, B-V = 1.35, U-B = 1.32 (1979A&AS...38..355L) --- spectral type K5 (1979A&AS...38..355L) --- not resolved in any modern catalogues, so I can't give you any new relative astrometry from VizieR =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: AG+50 184 red companion Date: Sun, 02 Jan 2011 22:17:52 -0700 This is a K dwarf with proper motion a little over the 0".15/year large-motion threshold. On SDSS and 2MASS images, a companion comes up strongly at longer wavelengths, suggesting it is a lower-mass companion (but not definite). Since the primary is overexposed on the SDSS images, the following are estimates. AG+50 184 = TYC 3290-0182-1 = UCAC2 48141827 1 36 19.51 +50 43 35.5 (J2000, UCAC2) --- UCAC3 cribs from Lepine LSPM, but could use AC2000, AGK2 et seq --- separation 2".0 in pa 38, epoch 1994.2348 (SDSS DR7) --- V = 10.7 + 18? (Tycho-2 for primary, mere guess for secondary) --- spectral type K (1956PMcCO..13a....B); 2MASS J-K and large motion consistent with K0 dwarf for primary =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 24776, BD+49 1074 cpm pair Date: Sun, 02 Jan 2011 23:24:50 -0700 These two have very similar motion in available catalogues, and the spectral types are consistent with their being physical. UCAC3 has a good dataset. HD 24776 = BD+49 1073 = TYC 3335-0753-1 = 3UC 281-062480 3 58 42.39 +50 12 58.7 (J2000, UCAC3) --- B comp = BD+49 1074 = TYC 3335-0483-1 = 3UC 281-062485 --- separation 32".75 in pa 137.1, epoch 2000.0 (UCAC3) 32".82 in pa 137.1, epoch 1904.171 (AC2000) --- V = 9.2 + 9.7 (Tycho-2) --- spectral types F0 + G0 (1956PMcCO..13a....B) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+49 3484, 83 cpm? pair Date: Mon, 03 Jan 2011 13:09:38 -0700 These are fairly far apart, but the (small) motions, magnitudes, and spectral types are consistent with a physical pair. Good astrometric history shown in UCAC3. BD+49 3484 = TYC 3597-1502-1 = 3UC 281-188383 21 14 21.63 +50 14 52.5 (J2000, UCAC3) --- B comp = BD+49 3483 --- separation 44".36 in pa 206.1, epoch 2000.0 (UCAC3) 44".44 in pa 205.6, epoch 1903.1 (AC2000, slightly different mean epochs) --- V = 9.4 + 10.2 (Tycho-2) --- spectral types A0 + A2 (1956PMcCO..13a....B) A0V (1939UppAn...1a...1V, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 232676, AG+51 243 cpm pair Date: Mon, 03 Jan 2011 17:58:56 -0700 Another very wide but more certain common-motion pair. HD 232676 = TYC 3307-1745-1 = 3UC 284-045845 2 34 30.50 +51 58 19.2 (J2000, UCAC3) --- B comp = AG+51 243 = TYC 3307-1548-1 = 3UC 284-045882 --- separation 77".59 in pa 44.9, epoch 2000.0 (UCAC3) 77".45 in pa 45.0, epoch 1903.438 (AC2000) --- V = 9.3 + 10.3 (Tycho-2) --- spectral types: F2 (1927AnHar.100...33C, primary) G0 (1956PMcCO..13a....B, secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+84 183 is cpm pair Date: Tue, 04 Jan 2011 21:59:14 -0700 This confirms a UCAC3 5,6 pair. Looks as though UCAC3 also picked up the AC2000 measure for the companion. BD+84 183 = TYC 4631-1710-1 = 3UC 349-009476 8 46 02.13 +84 06 55.1 (J2000, Tycho-2) --- B comp = AC2000 1998434 = 3UC 349-009479 --- separation 7".40 in pa 129.6, epoch 2000.0 (UCAC3) 7".17 in pa 129.2, epoch 1900.141 (AC2000) --- V = 9.5 + 12.0 (Tycho-2 for primary, UCAC3 delta-mag) --- spectral type F8 (1956PMcCO..13a....B, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+84 249 is cpm pair Date: Tue, 04 Jan 2011 22:44:19 -0700 These two stars have motion and spectral types/colors consistent with their being physical. BD+84 249 = TYC 4632-0190-1 = 3UC 348-012123 11 10 23.90 +83 46 34.2 (J2000, Tycho-2) --- B comp = TYC 4632-0007-1 = 3UC 348-012126 --- separation 27".62 in pa 158.3, epoch 2000.0 (UCAC3) 27".61 in pa 158.3, epoch 1984.10 (GSC-ACT, n=2) 27".38 in pa 158.4, epoch 1900.278 (AC2000) --- V = 10.2 + 12.4 (Tycho-2) --- spectral type F5 (1956PMcCO..13a....B, primary only); secondary J-K = 0.34 implies G dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD+83 612 is optical double Date: Wed, 05 Jan 2011 21:38:23 -0700 This UCAC3 5,6,7 pair appears to be an optical double. The relative motion is in the same sense as indicated by the UCAC3 proper-motions. Not sure this is worth a WDS entry. BD+83 612 = TYC 4649-0978-1 = 3UC 349-018333 21 23 32.60 +84 16 59.6 (J2000, Tycho-2) --- B comp = AC2000 2081781 = 3UC 349-018331; 3UC 349-018332 is a mixed entry via SuperCOSMOS --- separation 3".90 in pa 151.2, epoch 1899.125 (AC2000) 3".55 in pa 193.8, epoch 1998.720 (2MASS) 3".52 in pa 193.0, epoch 2000.0 (UCAC3) --- POSS-I images suggest pa ~170, consistent with intermediate epoch --- V = 11.6 + 12.7 (Tycho-2 for primary, adjusted UCAC3 for comp) --- spectral type G5 (1956PMcCO..13a....B, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Es 2242 = TDT 1620 ? Date: Wed, 05 Jan 2011 22:59:30 -0700 These are shown together in the WDS with the Espin WDS name differing by -1m in RA, but at the same coords. There seems to be just the one pair here. The pair is resolved in SDSS DR7, but the coordinates yield discrepant relative positions (southern star west of the northern star). Well into the saturated regime for SDSS of course. WDS 19393+3441 = WDS 19404+3441 19 40 22.24 +34 41 20.2 (Tycho-2 for A comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 241341 faint cpm comp Date: Thu, 06 Jan 2011 01:02:38 -0700 This HDE star has a faint common-motion companion clearly visible from comparison of the POSS-I with recent images. HD 241341 = TYC 2389-1549-1 = UCAC2 42545311 5 11 51.78 +30 54 44.9 (J2000, UCAC2) --- separation 28".76 in pa 118.5, epoch 1955.807 (USNO-A2.0) 28".93 in pa 118.5, epoch 1999.907 (2MASS) 28".69 in pa 118.0, epoch 2003.438 (CMC14, slight epoch difference) --- V = 10.8 + 18.2 (Tycho-2 for primary, GSC-2.3 V for secondary) --- spectral type K0 (HDE, but J-K indicates ~K2 or so; delta-mag implies mid-M comp) --- USNO-B1.0, NOMAD, and PPMXn all miss the companion due to crowding on POSS-I plates =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 241063 is double Date: Thu, 06 Jan 2011 11:18:34 -0700 This star is lopsided on DSS images and partially resolved in 2MASS images. It is a distant (~100pc) Hipparcos star with large proper motion. HD 241063 = TYC 1845-3879-1 = UCAC2 40308823 = NLTT 14567 5 09 34.68 +24 19 31.1 (J2000, UCAC2) --- separation 2".5 in pa 280, epoch 1997.923 (estimate from 2MASS) --- V = 10.3 + 14? (Tycho-2 for primary, estimate for comp) --- spectral type K2 (HDE, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 241511 cpm companion Date: Thu, 06 Jan 2011 11:42:59 -0700 This one is fairly subtle on available images, but the epoch difference between the POSS-II red, far-red, and 2MASS is enough to spot the faint companion. Another distant (~65pc) Hipparcos star with large motion. HD 241511 = G 85-51 = TYC 1846-1070-1 = UCAC2 40145145 5 12 42.01 +23 53 35.8 (J2000, UCAC2) --- separation 8".94 in pa 119.8, epoch 2000.854 (2MASS) --- V = 10.3 + 19? (published V for primary, a guess for secondary) --- spectral type K (HDE for primary, UBV colors suggest ~k1v) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 242500 cpm companion Date: Sat, 08 Jan 2011 21:52:32 -0700 This K-dwarf star appears to have a white dwarf companion sharing common proper motion. The Schmidt-plate based surveys "almost" show the companion correctly. HD 242500 = TYC 1847-1042-1 = UCAC2 39804780 5 19 12.58 +22 56 18.9 (J2000, UCAC2) --- separation 12".80 in pa 46.3, epoch 2001.879 (CMC14, n=1) 12".63 in pa 46.1, epoch 1997.843 (2MASS, BCU) 13".1 in pa 45.6, epoch 1951.985 (est from POSS-I) ...all sets of differential astrometry less good than usual --- V = 10.6 + 16.8 (Tycho-2 for primary, GSC-2.3 for secondary) --- spectral type K0 (HDE) --- companion is quite blue, presumably a white dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CPD-49 1 is cpm pair Date: Sun, 09 Jan 2011 21:44:06 -0700 I realized this evening that the classic "Cape Faint" catalogue of 1939 was posted at VizieR (item I/6). A couple years ago I got a copy through the Japanese data center because it had been de-listed at the Strasborug VizieR. But it has been made available again for some reason, which means I now have a copy with equinox 2000 positions with the (Cape) motions applied --- which eases the work of getting coordinates considerably. I am interested in it since it has ~12,000 spectral types by Annie Cannon that are not in the HD/HDE. In looking this over very cursorily, I noticed right away the double entry CF 6 + 7, linked with CPD-49 1. The Cape Faint catalogue shows this as having moderately large common-motion, so it is surprising that it is not in the WDS. Only the primary is shown in Tycho-2, and it is omitted altogether in UCAC2, but UCAC3 shows it as a 5,6 pair. The 1930s-epoch Cape position is off by only an arcsecond even when the motion is applied to epoch 2000. CPD-49 1 = CD-49 1 = TYC 8025-0547-1 = 3UC 082-000228 0 06 27.33 -49 10 55.9 (J2000, Tycho-2) --- separation 10".50 in pa 86.1, epoch 1904.241 (AC2000) 10".29 in pa 85.9, epoch 2000.0 (UCAC3) 10".31 in pa 86.1, epoch 2000.564 (2MASS) --- V = 10.1 + 10.9 (Tycho-2 for primary, adjusted UCAC3 for comp) --- spectral type K0 (Cannon via 'Cape Faint' catalogue, probably for combined light) The 'Cape Faint' catalogue is not in the observatory series, so there's no volume/page-number, as with the Cape photographic catalogues, for instance. The CDS shows the bibcode as 1939HMSO..C......0S (HMSO = Her/His Majesty's Stationery Office, i.e. the publisher!); the ADS goes with an acronym based on the title (Carolyn Stern Grant says she's to blame for these): 1939cfsc.book.....S. Presumably there'll be more of these, plus identifying and omitting all the HD stars for my purposes, but this at least should be straightforward, if tedious. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD-02 356 cpm companion Date: Tue, 11 Jan 2011 15:14:42 -0700 This is a clear common-motion pair from DSS1/2 and 2MASS images. BD-02 356 = TYC 4689-0306-1 = UCAC2 31098262 = 3UC 177-005982 2 05 05.15 -01 58 56.2 (J2000, UCAC2) --- B comp = 3UC 177-005980 --- separation 9".95 in pa 207.6, epoch 1998.742 (2MASS) 9".93 in pa 206.6, epoch 2000.682 (CMC14) --- V = 9.8 + 16.1 (Tycho-2 for primary, adjusted UCAC3 for comp) --- spectral type G5: (Yale zone via 1945AJ.....51..187G for primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06110-0331 = hj 2299 mis-ID Date: Tue, 11 Jan 2011 20:44:12 -0700 The WDS coords for this trio are for BD-03 1325, not BD-03 1323, as specified. BD-03 1325 is single, while 1323 lies about 75" west. The primary is not in Tycho-2, but appears elsewhere. The star-group in the general area is NGC 2184. BD-03 1323 = HD 294709 = UCAC2 30479203 6 10 58.25 -03 30 58.6 (J2000, UCAC2) --- spectral type A2 (HDE, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 06405-0331 comment Date: Tue, 11 Jan 2011 22:11:59 -0700 This recent pair is actually a trio in a roughly equilateral triangle. The astrometry catalogues are partly confused because the position for the star east has been linked with the star NE to produce a spurious large proper motion in Tycho-2. Curiously, AC2000 misses the star NE, which has caused the problem. UCAC3 has only two of the stars as well. I think the WDS ought to be rejiggered to show the three components and omit the false large motion of the B component. HD 47840 = BD-03 1542 = TYC 4803-2200-1 6 40 29.98 -03 31 28.2 (J2000, UCAC2) --- AB: separation 17".61 in pa 16.1, epoch 1992.25 (Tycho-2 epoch) --- V = 8.7 + 10.2 --- AC: separation 19".02 in pa 83.4, epoch 1998.802 (2MASS) 14".93 in pa 89.5, epoch 1894.19 (AC2000) --- V = 8.7 + 11.0 --- Houk shows spectral types F2/3 + K0:III:, which apply to A and C, resp. VizieR shows there's the revised Hipparcos astrometry by Fabricius et al; there is also CMC14, 2MASS, and DENIS astrometry available. While AC is clearly optical, the J-K color of C does not rule out it being linked with the primary. You may be able to piece together differential measures from the single observations in various sources. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 07106-0250, 07109-0251 separated at birth? Date: Wed, 12 Jan 2011 13:15:42 -0700 Just a "maybe", but I wasn't able to see the companion to WDS 07106-0250 on various images, though I attributed it to the delta-m being larger than Aitken shows. But I notice 15s due east is WDS 07109-0251 with TDS specs suspiciously similar to the Aitken pair. Could this be the intended pair? N.B. the TDS pair is HD 296557 = BD-02 1966. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 07528-0355 problem Date: Wed, 12 Jan 2011 13:53:37 -0700 This pair might be misidentified. The pair at the WDS position seems to be fixed between POSS-I and "recent", so the early pa 116 might apply elsewhere, or results from some other error. There is no other likely pair within a few arcminutes radius, but I didn't look any farther than that. ASAS-3 shows the combined light of the pair at the WDS position as 11.55, so the magnitudes will need to be adjusted if you decide to keep this pair. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 13301-0413 comment Date: Thu, 13 Jan 2011 01:04:00 -0700 This is one of the large number of BVD pairs. I want to complain that all (or nearly all) their spectral types are derived from photometry, and thus are not legitimately expressed in MK notation. I would agree that you could say this pair (for instance) are "likely to be dwarfs near G0", but that's about it. Neither the 2MASS nor the Tycho-2 photometry is accurate enough to be any more specific. And of course spectral types must be found from spectra, not colors as is done here. For this pair the formal errors taken in quadrature are: source color uncertainty Tycho-2 BT-VT 0.078 (comp A) 0.120 (comp B) 2MASS J-Ks 0.039 (comp A) 0.036 (comp B) ...taking the combined uncertainties on the 2MASS data. If you have a look at Figure 6 of the Tycho-2 construction paper (2000A&A...357..367H), you can see that below about mag 9.5 or so, i.e. for the bulk of the Tycho-2 stars, the errors on the BT and VT magnitudes are underestimated by 50% --- so one needs to increase the errors shown above to 0.118 and 0.180 mag, which makes the color error at least half a spectral type in this part of the HR diagram. The derived spectral type error for the 2MASS data is ~1/3 of a class. The trouble with promulgating this sort of thing in the WDS is that people start quoting the types as though someone determined full-up MK types from spectra of the proper dispersion. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: BD-04 4564 cpm? companion Date: Thu, 13 Jan 2011 21:24:36 -0700 Can't quite be sure about this one due to crowding in the Scutum starcloud, but it looks as though this star has a common-motion companion. BD-04 4564 = TYC 5121-0443-1 = UCAC2 30406809 18 43 42.17 -04 12 42.2 (J2000, UCAC2) --- separation 14".73 in pa 23.0, epoch 1999.315 (DENIS) 14".82 in pa 23.1, epoch 1999.364 (2MASS) 14".77 in pa 22.8, epoch 2000.0 (UCAC3, 2000.57 for secondary) 14".94 in pa 22.7, epoch 2003.110 (CMC14) --- V = 10.0 + 13.2 (Tycho-2 for primary, adjusted UCAC3 for comp) --- spectral type G2V (1965ApJS...12..215H for primary); photometric colors for secondary are consistent with an early-K dwarf, consistent with delta-mag On Thu, 2011-01-13 at 21:24 -0700, Brian Skiff wrote: an addendum: 14".95 in pa 23.2, epoch 2006.0 (GLIMPSE/Spitzer) ...dunno how good the Spitzer astrometry is, but a little previous experience suggests it is in the ~0".1 - 0".2 range. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CPD-53 6997 trio Date: Fri, 14 Jan 2011 00:07:38 -0700 In a preprint on tonight's astro-ph, DePew et al (MASH planetary nebulae group) note that this is a new Wolf-Rayet star in a trio with a surrounding emission nebula. The two companions are almost certainly related. Details in the appendix of: http://arxiv.org/abs/1101.2468 (accepted for MNRAS) CPD-53 6997 = CD-53 6376 = UCAC2 08349688 16 03 42.08 -54 02 00.6 (J2000, UCAC2) --- AB: 4".36 in pa 358.1, epoch 2000.145 (2MASS) V = 10.9 + 15 (ASAS-3 for primary, estimate for B comp) --- AC: 7".07 in pa 232.5, epoch 2000.145 (2MASS) 7".04 in pa 234.7, epoch 1999.32 (DENIS, n=2) 6".99 in pa 225.3, epoch 1927.70 (2005AJ....130.2701F) 7".08 in pa 224.0, epoch 1897.570 (2007A&A...469.1221F) V = 10.9 + 12.5 (ASAS-3 for primary, UCAC3 for C comp) The Fresneau et al scans of the Sydney AC plates may not be all that good, so perhaps can be ignored. The C comp is also recorded on various Schmidt plates, UCAC3, and GLIMPSE, but the results aren't necessarily any more reliable. Not expecting any proper motion or relative change here in any case, so the 2MASS data are probably good enough for now. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: LDS 5998 recovered Date: Sat, 15 Jan 2011 22:00:58 -0700 Happened to notice this one is a bit off in the WDS. WDS 22591-0213 = LDS 5998 = 2MASS J22591396-0213417 22 59 13.96 -02 13 41.7 (J2000, 2MASS) --- separation 7".39 in pa 111.5, epoch 1953.912 (USNO-A2.0) 7".51 in pa 111.5, epoch 1985.550 (SuperCOSMOS) 7".37 in pa 111.5, epoch 1991.679 (GSC-2.3) 7".52 in pa 110.9, epoch 2000.674 (2MASS) --- the SuperCOSMOS datum is from the UK Schmidt IIIa-J plate --- the Luyten blue mags are okay for now =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-48 36 cpm? companion Date: Sun, 16 Jan 2011 20:40:58 -0700 This is a "definite maybe", but needs another epoch to be sure the two stars are linked. CD-48 36 = TYC 8023-0061-1 = UCAC2 11454352 = 2MASS J00173025-4726002 0 17 30.25 -47 26 00.3 (J2000, UCAC2) --- separation 7".61 in pa 85.7, epoch 1999.723 (2MASS) 7".53 in pa 85.9, epoch 1996.69 (DENIS, n=2) --- V = 11.3 + 16 (ASAS-3 for primary, estimate for secondary) --- spectral type K (Cape Faint catalogue, primary only; J-K suggests late-K dwarf) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-47 365 cpm pair Date: Sun, 16 Jan 2011 23:35:48 -0700 This is a certain pair of moderate proper motion that confirms a UCAC3 5,6 pair. CD-47 365 = TYC 8033-0106-1 = UCAC2 11455787 = 3UC 086-002611 1 15 04.46 -47 06 54.6 (J2000, UCAC3) --- B comp = 3UC 086-002612 --- separation 2".85 in pa 29.4, epoch 2000.0 (UCAC3) --- V = 11.5 + 12.5 (ASAS-3 combined V and UCAC3 delta-mag) --- spectral type K0 (Cape Faint catalogue, probably mainly for primary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 03005-4325 pa flip Date: Mon, 17 Jan 2011 11:51:16 -0700 This pair needs to have 180 deg added to the position angle. The fainter component is clearly the southern one across the visible/near-IR. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 03290-4909 follow-up obs Date: Mon, 17 Jan 2011 15:36:13 -0700 This one seems to have only the original Luyten observation, evidently with the position-angle as 'sp', since correct direction is quite a bit different from pa225. WDS 03290-4909 = LDS 98 source rho theta epoch GSC-ACT 39.67 255.2 1977.712 2MASS 39.16 258.5 1999.791 USNO-B1.0 39.49 258.7 2000.0 (n=3 only for companion, so maybe uncertain) --- maybe a hint here that the pair are optical, but have similar but not identical motion =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 03300-4912 follow-up obs Date: Mon, 17 Jan 2011 15:50:22 -0700 This appears to be an optical pair whose separation is increasing steadily since the last Barton observation. Just one example shown here. WDS 03300-4912 = Brt 654 UCAC2: 9".01 in pa 88.0, epoch 2000.0 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-47 1087 cpm? companion Date: Mon, 17 Jan 2011 19:10:12 -0700 This is another "likely" case that needs another epoch to decide whether or not it has common motion. This pair was also reported by Rousseau. CD-47 1087 = CPD-47 360 = TYC 8060-2012-1 = UCAC2 11459415 3 34 44.47 -47 16 12.1 (J2000, UCAC2) --- separation 6".55 in pa 202.0, epoch 1999.646 (2MASS) --- V = 10.3 + 14 (published V for primary, estimate for secondary) --- spectral type G0 (Cape Faint catalogue; the VizieR report suggests the star is somewhat metal-poor) --- N.B. the large proper motion =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-44 1590 cpm(?) companion Date: Mon, 17 Jan 2011 21:16:07 -0700 This one is a little more certain than the previous uncertain ones, but still needs another epoch to be sure. The companion lies just off the diffraction spikes on the Schmidt plates, so USNO-B1.0 seems to be catching it with a bit of an error in the motion. The USNO-A2.0 offset is probably somewhat off for the same reason. GSC-2.3 unfortunately has a J2000 position for the primary, and the secondary from an earlier Schmidt plate epoch. Even the 0.8-year epoch difference between 2MASS and DENIS might be enough to be convincing, given the substantial motion of the primary. CD-44 1590 = CPD-44 492 = TYC 7585-0458-1 = UCAC2 12826450 = 2MASS J04303334-4400036 4 30 33.35 -44 00 03.7 (J2000, UCAC2) --- separation 18".72 in pa 349.4, epoch 1999.739 (2MASS) 18".74 in pa 349.2, epoch 1998.917 (DENIS) 18".16 in pa 350.5, epoch 1983.370 (USNO-A2.0) --- V = 10.1 + 16.7 (ASAS-3 V for primary, NOMAD V for secondary) --- spectral type K (Cape Faint catalogue, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 272456 cpm companion Date: Mon, 17 Jan 2011 22:12:32 -0700 This one is quite certain, and appears correctly in UCAC3. HD 272456 = CD-44 1726 = CPD-44 544 = TYC 7592-0163-1 = UCAC2 13054577 = 2MASS J04493356-4351338 --- separation 16".67 in pa 156.8, epoch 2000.0 (UCAC3) 16".66 in pa 156.7, epoch 1999.775 (2MASS) 16".76 in pa 156.7, epoch 1996.003 (DENIS, n=2) --- V = 10.3 + 16.1 (ASAS-3 V for primary, adjusted UCAC3 for secondary) --- spectral type K0 (HDE for primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 31242 cpm companion Date: Mon, 17 Jan 2011 22:36:59 -0700 I noted this one some time ago in my spectral types file, but it does not appear to be in the WDS. Good common motion shown in UCAC2. HD 31242 = CD-46 1587 = CPD-46 500 = TYC 8007-0657-1 = UCAC2 11686781 4 51 53.54 -46 47 13.3 (J2000, UCAC2) --- separation 18".43 in pa 196.6, epoch 2000.0 (UCAC2) 18".28 in pa 196.5, epoch 1999.720 (2MASS) 18".40 in pa 196.6, epoch 1996.934 (DENIS) 18".24 in pa 194.3, epoch 1975.909 (GSC-ACT) 18".16 in pa 195.6, epoch 1902.8 (AC2000, slightly different epochs) --- V = 9.7 + 12.9 (Tycho-2 for primary, adjusted UCAC3 for comp) --- spectral types G5V + M0Ve (2006A&A...460..695T) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 273806 is cpm pair Date: Tue, 18 Jan 2011 11:57:37 -0700 This looks good per UCAC2 etc proper motions; this also confirms a UCAC3 5,6 pair. HD 273806 = CD-47 1719 = CPD-47 541 = TYC 8078-0535-1 = UCAC2 11463127 5 10 55.17 -47 21 21.9 (J2000, UCAC2) --- B comp = UCAC2 11463128 --- separation 9".06 in pa 18.2, epoch 2000.0 (UCAC2) 9".14 in pa 18.1, epoch 1999.775 (2MASS) 9".33 in pa 17.9, epoch 1902.943 (AC2000) --- V = 10.2 + 11.5 (Tycho-2 for primary, adjusted UCAC3 for comp) --- spectral type F5 (HDE, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 05522-5055 recent obs Date: Thu, 20 Jan 2011 13:31:02 -0700 This one needs a modern measurement since the primary is moving fairly fast away from the secondary. WDS 05522-5055: 13".07 in pa 5.9, epoch 2000.156 (2MASS) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 41022 cpm companion Date: Thu, 20 Jan 2011 14:03:25 -0700 The similarly-bright distant companion to this HD star shares common motion. A third faint star in the field has similar motion, but the colors indicate it cannot be related. HD 41022 = CD-42 2275 = TYC 7619-1270-1 = UCAC2 13696746 6 00 26.57 -42 28 31.5 (J2000, UCAC2) --- B comp = CD-42 2277 = CPD-42 799 = TYC 7619-1174-1 = UCAC2 13696749 --- separation 73".18 in pa 21.0, epoch 2000.0 (UCAC2) 73".18 in pa 21.0, epoch 1962.05 (CPC2 rev) 73".12 in pa 20.9, epoch 1903.612 (AC2000) --- Tycho-2 etc astrometry also available --- V = 9.2 + 10.2 (Tycho-2) --- spectral types F6/7V + G5 (Houk for primary, Cape Faint catalogue for secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-44 2948 cpm companion Date: Mon, 24 Jan 2011 22:22:19 -0700 Happened to notice this one amongst the 'Cape Faint' stars. CD-44 2948 = CPD-44 1116 = TYC 7640-0367-1 = UCAC2 12602209 6 50 06.66 -44 31 01.4 (J2000, UCAC2) --- separation 33".57 in pa 255.4, epoch 1999.255 (2MASS) 33".71 in pa 255.4, epoch 2000.101 (DENIS) --- V = 9.7 + 12.6 (published V for primary, adjusted UCAC3 for comp) --- spectral type K2 (Cannon, Cape Faint catalogue), primary only; J-K for the secondary is consistent with M dwarf --- note that USNO-B1.0 has the proper motion about right for the secondary from n=3 plates; other sources mostly wrong --- USNO-A2.0 and GSC-2.3 have relatively poor coords for the bright primary and also separate epochs, so are omitted here =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-41 2609 cpm pair Date: Mon, 24 Jan 2011 22:34:56 -0700 The next entry in the 'Cape Faint' catalogue is another cpm pair.... CD-41 2609 = CPD-41 1125 = TYC 7636-1478-1 = UCAC2 13908119 6 50 25.74 -41 31 46.6 (J2000, UCAC2) --- B comp = UCAC2 13908118 --- separation 11".49 in pa 354.7, epoch 2000.0 (UCAC2) 11".53 in pa 354.9, epoch 1999.123 (2MASS) 11".48 in pa 354.7, epoch 1902.2 (AC2000, slightly different epochs) --- V = 10.3 + 12.1 (Tycho-2 V for primary, UCAC2 for secondary) --- spectral type G5 (Cannon, Cape Faint catalogue, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jack@stsci.edu Subject: HD 10720 third cpm component Date: Sat, 29 Jan 2011 23:27:47 -0700 I have started to have a look at the double stars in the good list of southern K dwarfs published by Upgren et al (1972AJ.....77..486U). When I worked over the list in 2007, I noted several pairs, probably mainly by reference to the TDSC. But without an easy way to look at the WDS, I could not tell if any of them were new. Now that it's in VizieR, this is trivial. However the first "new" case is a common-motion component to an Hipparcos _optical_ double: UGP 21 = HD 10720 = WDS 01432-5801 = HDS 229 --- AC: 25".25 in pa 102.5, epoch 1999.816 (2MASS) 25".44 in pa 102.5, epoch 1998.882 (DENIS) 25".32 in pa 102.7, epoch 1998.67 (UCAC3) --- V = 9.3 + 15.7 (published V for primary, adjusted UCAC3 for comp) --- 2MASS color of the C component is consistent with an M dwarf, and is another star for which there's an inferred Hipparcos parallax --- motion seems to be confirmed via Aladin composite, cf also UCAC3 --- the Schmidt-plate-based astrometric catalogues have a mix of epochs, so additional differential observations from VizieR are problematic; perhaps there is data in the WCC to derive an additional older point or two. even the 1.1-year baseline between UCAC3 and 2MASS is enough to secure the link, since annual motion is ~0".24 per year. --- I note that the Hipparcos B component appears to have small motion, so that in AC2000 we have: 20".41 in pa 257.4, epoch 1893.732; or just comparing the coordinates in AC2000 and 2MASS: 1 43 10.638 -58 00 21.08 AC2000, 1893.732 1 43 10.596 -58 00 22.58 2MASS, 1999.816 ...or about ~25 mas/year, versus ~240 mas/year for the K dwarf, so this clearly an optical companion. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jack@stsci.edu Subject: WDS 03379-0231 Hip/Tyc error ? Date: Sun, 30 Jan 2011 00:32:06 -0700 This one, another Upgren K dwarf, appears to have a spurious companion in the Hipparcos/Tycho data. Or, at least, the nominal companion is not obvious on any images, whereas if it is redder than the primary, it ought to be apparent in the 2MASS images if not the lower-res DSS stuff. However, the star somewhat farther southwest clearly shares common motion. The star was picked up in UCAC3 with correct motion matching the primary, even if there is no motion in that catalogue for the primary (as there should be). UGP 62 = HD 22584 = WDS 03379-0231 = HDS 460 --- AC: separation 13".48 in pa 205.1, epoch 2000.717 (CMC14, n=2) 13".60 in pa 205.0, epoch 1998.728 (2MASS) 13".57 in pa 205.2, epoch 1998.950 (DENIS) --- V = 9.6 + 12.9 (published V for primary, adjusted UCAC3 for comp) --- Hipparcos companion probably spurious =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09305-3206 additional obs Date: Sun, 30 Jan 2011 12:03:52 -0700 This one has only the original Luyten measure showing. --- 11".08 in pa 208.2, epoch 1999.205 (2MASS) --- the UCAC3 proper motion for the companion is wrong =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jack@stsci.edu Subject: UGP 236 + 237 cpm pair Date: Sun, 30 Jan 2011 12:22:19 -0700 This pair was reported by Upgren et al. UGP 236 = CD-38 6535 = CPD-38 4188 = TYC 7710-1900-1 10 31 40.70 -38 40 21.7 (J2000, UCAC2) --- B comp = UGP 237 --- separation 8".16 in pa 2.7, epoch 1909.760 (AC2000) 7".74 in pa 2.1, epoch 1999.260 (2MASS) --- V = 10.7 + 10.7 (ASAS-3 combined V = 9.96, delta-mag = 0) --- spectral types K7V + K7V (1972AJ.....77..486U) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11154-1807 C measurement error Date: Sun, 30 Jan 2011 12:58:57 -0700 I started to write that the C comp of this wide trio has similar but not identical motion to the brighter AB pair. However, it turns out that the WDS measurements appear to be wrong, and in fact the motion is the same, as generally assumed in the literature. Looking a little farther, it could be that the WDS measurements for AC are actually for BC. At present the eastern component of the brighter pair is shown as A in the WDS. So it might be just a component assignment confusion. WDS 11154-1807 AC: 96".72 in pa 310.0, epoch 1956.188 (USNO-A2.0) 96".60 in pa 309.5, epoch 1998.337 (2MASS) 96".69 in pa 309.5, epoch 2004.756 (CMC14, n=3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 19573-1234 additional obs Date: Sun, 30 Jan 2011 18:32:40 -0700 This has just the original Luyten measurement. LDS 4824: 62".65 in pa 76.6, epoch 1999.430 (2MASS) 62".59 in pa 76.1, epoch 1951.722 (USNO-A2.0) --- UCAC3 motion for the secondary is wrong =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 23103-6850 additional obs Date: Sun, 30 Jan 2011 18:56:48 -0700 This one has only the original Rousseau observation; most of their objects are optical, but this one shows common motion. Rss 575: 13".06 in pa 72.1, epoch 1999.909 (2MASS) --- companion is very blue, so presumably a white dwarf down around Mv = 12 [correction sent Feb 13: pa 107.9, not 72.1 deg] =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 23167-3635 comment Date: Sun, 30 Jan 2011 19:08:53 -0700 This Hipparcos pair has a note saying it results from a reduction flaw. Nevertheless it does seem to be double, though only marginally visible on 2MASS images. I would estimate that the separation is smaller, delta-mag larger, and flip the pa to something like: 10.7 + 11.7, ~1".5, pa 296. It's nothing a quick speckle (or even visual) observation couldn't confirm. Combined V = 10.38 +/- 0.04 in ASAS-3, somewhat brighter than what's implied by the HDS magnitudes. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jack@stsci.edu Subject: UGP 22 companion Date: Sun, 30 Jan 2011 20:05:27 -0700 OK, I have completed matching the UGP K dwarfs list against the WDS in VizieR. This mainly yielded minor corrections to the WDS and also some bookkeeping additions to my files (so only a few of the notes were copied to Jack). One of the pairs I noted is not present in the WDS (even as an 'SKF' object), which I'll send along in due course. Now I'm looking at each star not already flagged as double to see what's there. I'm looking at only a 2'x2' box with SkyView, so more distant companions will be missed, but ought to show up in astrometric catalogues once they're cleaned up. A significant fraction of the UGP entries already have known companions, so perhaps there won't be many more. UGP 22 = BD-13 321 = TYC 5280-0020-1 = UCAC2 27222306 1 47 43.36 -12 46 14.4 (J2000, UCAC2) --- separation 3".0 pa 228, epoch 1998.531 (estimates from 2MASS J&K images) --- V = 9.8 + 15? (published V for primary, estimate for secondary) --- spectral type K5V (1972AJ.....77..486U) --- companion is not present as an isolated star on earlier-epoch Schmidt plates at the location of the 2MASS image, so I make the presumption that it is connected to the brighter K dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jack@stsci.edu Subject: UGP 25 cpm companion Date: Sun, 30 Jan 2011 20:39:33 -0700 This star has an overlooked common-motion companion. UGP 25 = HD 12617 = CD-41 568 = CPD-41 187 2 02 45.05 -40 57 03.1 (J2000, UCAC2) --- separation 36".22 in pa 66.3 epoch 1998.687 (DENIS) 36".07 in pa 66.6, epoch 1999.597 (2MASS) --- V = 9.0 + 15.2 (published V for primary, adjusted UCAC3 for comp) --- spectral type K3V (Houk) K2V (1972AJ.....77..486U) K3V (2006AJ....132..161G) ...for primary only =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jack@stsci.edu Subject: UGP 51 cpm companion Date: Sun, 30 Jan 2011 20:56:54 -0700 This one is nicely resolved in the 2MASS images. UGP 51 = HD 20492 = BD-21 594 = CPD-21 334 3 17 14.87 -20 41 08.9 (J2000, UCAC2) --- separation 5".48 in pa 50.2, epoch 1998.884 --- V = 9.7 + 15 ? (published V for primary, estimate for secondary) --- spectral type K3V (Houk) K3V (1972AJ.....77..486U) K3.5V (2006AJ....132..161G) ...primary only =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 80 cpm companion Date: Sun, 30 Jan 2011 21:24:41 -0700 Another easy one. UGP 80 = BD-09 872 = TYC 5313-2344-1 4 20 14.24 -09 02 13.5 (J2000, UCAC2) --- separation 17".96 in pa 300.3, epoch 1982.816 (GSC-ACT) 18".21 in pa 300.3, epoch 1998.947 (2MASS) 18".08 in pa 300.2, epoch 2003.972 (CMC14) --- V = 9.8 + 15.5 (published V for primary, adjusted UCAC3 for secondary) --- spectral type K5V (1972AJ.....77..486U, primary only) K4V (2006AJ....132..161G) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 94 third component Date: Sun, 30 Jan 2011 21:46:08 -0700 This is a known close pair, but a faint common-motion companion lies to the north. It has been involved with a field star and the Schmidt-plate diffraction spikes, so was easy to overlook previously. UGP 94 = HD 30703 = WDS 04480-4154 --- AC: 16".0 in pa 6, epoch 1998.986 (using 2MASS coords for primary and estimate from 2MASS images for secondary) --- V = 9.3 + 16? (published V for primary, estimate for secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 133 cpm companion Date: Tue, 01 Feb 2011 22:45:49 -0700 This is a relatively subtle one since the motion is small. However, the companion M dwarf has spectroscopy. UGP 133 = HD 41842 = TYC 6500-0186-1 = UCAC2 20312043 6 06 16.62 -27 54 21.0 (J2000, UCAC2) --- separation 19".25 in pa 34.1, epoch 1999.041 (2MASS) 19".15 in pa 33.9, epoch 1999.058 (DENIS) 19".07 in pa 34.8, epoch 1996.044 (DENIS) --- V = 8.9 + 14.0 (published V for primary, adjusted UCAC3 for comp) --- spectral types K2IV-V (1972AJ.....77..486U, primary) K2+ V (2006AJ....132..161G, primary) M3e (2006AJ....132..866R, secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 134 cpm companion Date: Tue, 01 Feb 2011 23:06:21 -0700 You don't have to work hard to find new companions in this list! It is odd in this case that the companion was overlooked by Luyten, by the Lowell proper-motion survey, and by Lepine. UCAC3 has both stars, but no motion for the companion. UGP 134 = HD 41853 = TYC 0730-1471-1 = UCAC2 34604544 6 07 52.30 +08 13 10.3 (J2000, UCAC2) --- separation 8".02 in pa 136.3, epoch 2000.025 (2MASS) --- V = 9.0 + 15.3 (published V for primary, adjusted UCAC3 for companion) --- spectral type K2V (1972AJ.....77..486U, 2006AJ....132..161G, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 179 third cpm companion Date: Wed, 02 Feb 2011 00:06:22 -0700 This close Rossiter pair has a more distant common-motion companion, present accurately in UCAC3, and also "almost" in USNO-B1.0 (two entries for the companion). UGP 179 = HD 69247 = WDS 08158-1027 8 15 45.12 -10 26 54.4 (J2000, UCAC2) --- ABxC: separation 26".97 in pa 142.8, epoch 1955.881 (USNO-A2.0) 26".82 in pa 142.5, epoch 1999.016 (2MASS) 26".76 in pa 142.5, epoch 2000.0 (UCAC3) --- UCAC3 astrometric mix for companion is okay --- V = 9.3 + 15.9 (published V for AB, adjusted UCAC3 for C comp) --- WDS already has spectral type for AB, 2MASS J-K for C is consistent with an M dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 202 companion Date: Wed, 02 Feb 2011 00:48:54 -0700 This is a marginal case that I'd skip over if it weren't that it's just inside the 25 pc "nearby" radius (Hip2 pi = 43 mas). The companion comes up in the 2MASS J & K images, but even my estimate below is rather uncertain. Obviously there's no direct observation of common motion, but merely likely. The companion is not present at the 2MASS location on the oldest DSS image. UGP 202 = HD 80545 = LHS 5149 = TYC 8591-0888-1 = UCAC2 06515049 9 18 08.88 -57 46 07.9 (J2000, UCAC2) --- separation 2".3 in pa 137, epoch 2000.016 (estimate from 2MASS) --- V = 9.5 + 15 ? (published V for primary, a guess for secondary) --- spectral type K7V (1972AJ.....77..486U, primary only) K6.5V (2006AJ....132..161G, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 207 cpm companion Date: Wed, 02 Feb 2011 01:23:27 -0700 The primary of this one was also picked by Stephenson as a dwarf. UGP 207 = BD-07 2815 = TYC 5460-1332-1 = UCAC2 28909615 9 28 42.93 -08 27 23.9 (J2000, UCAC2) --- separation 16".28 in pa 257.2, epoch 2003.945 (CMC14) 16".02 in pa 256.9, epoch 1999.047 (2MASS) 16".21 in pa 257.5, epoch 1998.567 (DENIS) --- the DENIS epoch is given as JD 2451021.52 = 1998 July 27, which must be in error, since the Sun is at RA ~9h on that calendar date --- V = 10.5 + 16.1 (published V for primary, adjusted CMC14 for companion) --- spectral type K5V (1972AJ.....77..486U, primary only); Stephenson (1986AJ.....91..144S) gave K4 from lower-dispersion plates =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 208 companion Date: Wed, 02 Feb 2011 01:35:31 -0700 Another close "likely" one that is resolved only in 2MASS. It is hinted at in the DSS far-red image. UGP 208 = HD 82282 = TYC 8953-1216-1 = UCAC2 02692202 9 27 57.59 -66 06 08.3 (J2000, UCAC2) --- separation 4".14 in pa 209.5, epoch 2000.008 (2MASS) --- V = 8.9 + 16 ? (published V for primary, estimate for secondary) --- spectral type K0.5V (2006AJ....132..161G), among others; Upgren et al give K2V, but this seems a bit too late wrt UBV and uvby colors =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 231 cpm? companion Date: Wed, 02 Feb 2011 02:09:06 -0700 Another "likely" one, but based on the modest motion between the POSS-I and 2MASS images, this seems more secure. UGP 231 = HD 89965 = TYC 6631-1280-1 = UCAC2 19896227 10 22 23.49 -28 50 51.4 (J2000, UCAC2) --- separation 15".15 in pa 149.2, epoch 1999.175 (2MASS) 15".00 in pa 149.5, epoch 1998.249 (DENIS) --- V = 9.5 + 17.7 (published V for primary, GSC-2.3 b+r/2 for companion) --- spectral type K3V (1972AJ.....77..486U, primary only; Houk also gives K3V from the same plates) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 271 cpm? companion Date: Wed, 02 Feb 2011 13:57:39 -0700 Another likely one. UGP 271 = CD-26 8683 = CPD-26 4555 = TYC 6660-0553-1 = UCAC2 20390431 11 39 08.16 -27 41 46.4 (J2000, UCAC2) --- separation 3".5 in pa 26, epoch 1998.518 (estimate from 2MASS) --- V = 10.0 + 15 ? (published V for primary, a guess for secondary) --- spectral type K7V (1972AJ.....77..486U, primary only) K2 (Kuiper via Bidelman, 1985ApJS...59..197B) K6V (2006AJ....132..161G) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 292 cpm companion Date: Wed, 02 Feb 2011 14:39:55 -0700 The companion here is visible on POSS-I/II, but well resolved only in 2MASS. UGP 292 = HD 107388 = TYC 6105-1127-1 = UCAC2 24114775 12 20 46.83 -19 53 45.8 (J2000, UCAC2) --- separation 6".61 in pa 291.9, epoch 1998.337 (2MASS) --- V = 9.0 + 14? (published V for primary, estimate for secondary) --- spectral type K3V (1972AJ.....77..486U, 2006AJ....132..161G, also K3 by Kuiper via Bidelman 1985ApJS...59..197B, all for primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 332 cpm companion Date: Wed, 02 Feb 2011 15:46:05 -0700 This one is far enough north to appear in the SDSS images. UGP 332 = BD+02 2719 = TYC 0308-0065-1 = UCAC2 32209045 13 45 39.94 +01 27 45.0 (J2000, UCAC2) --- separation 3".55 in pa 340.5, epoch 2000.3404 (SDSS DR7) 3".07 in pa 343.5, epoch 2000.159 (2MASS) 3".68 in pa 340.8, epoch 1994.6372 (SDSS DR7) ...SDSS images have the primary saturated of course, while the 2MASS images are merely poorly resolved, so perhaps all are rather uncertain --- V = 10.5 + 15 ? (ASAS-3 V for primary, estimate for secondary, SDSS photometry discrepant) --- spectral type K5V (1972AJ.....77..486U, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 346 cpm companion Date: Wed, 02 Feb 2011 20:16:34 -0700 This one is obvious from comparison of POSS-I/II images etc. UGP 346 = HD 125522 = TYC 5566-0312-1 = UCAC2 27851650 14 20 08.15 -11 03 30.3 (J2000, UCAC2) --- separation 14".16 in pa 241.1, epoch 1999.186 (2MASS) 13".98 in pa 240.4, epoch 2002.444 (CMC14) --- V = 10.1 + 17.1 (published V for primary, adjusted CMC14 for companion) --- spectral type K3V (1972AJ.....77..486U, primary only), also given as K3V by Houk from the same plates =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 350 cpm companion Date: Wed, 02 Feb 2011 20:34:51 -0700 This one is faint enough that it comes up only on the POSS-II far-red and 2MASS images. The epoch difference between those two is sufficient to show their common motion. UGP 350 = BD-07 3837 = TYC 5562-0563-1 = UCAC2 28922367 14 23 11.54 -08 06 58.6 (J2000, UCAC2) --- separation 9".11 in pa 310.5, epoch 1999.186 (2MASS) 8".69 in pa 310.5, epoch 1999.493 (DENIS) --- V = 9.9 + 18.0 (published V for primary, NOMAD V for companion) --- spectral type K5V (1972AJ.....77..486U, primary only); also K8V from Vyssotsky and K by Kuiper via Bidelman from less-good spectra --- this is a well-known motion star going back to Ross =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 366 companion Date: Wed, 02 Feb 2011 21:46:08 -0700 Another merely "likely" pair lacking direct evidence of common motion. UGP 366 = HD 132569 = TYC 6168-0001-1 = UCAC2 25547487 15 00 19.96 -16 32 28.4 (J2000, UCAC2) --- separation 4".31 in pa 307.3, epoch 1998.307 (2MASS) --- V = 9.8 + 15? (published V for primary, a guess for secondary) --- spectral type K2V (1972AJ.....77..486U, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 378 companion Date: Wed, 02 Feb 2011 22:06:47 -0700 This has a red companion that comes up on Sloan and 2MASS images. UGP 378 = TYC 5003-0645-1 = UCAC2 31345918 15 26 31.77 -01 15 12.2 (J2000, UCAC2) --- separation 3".73 in pa 231.2, epoch 2001.4544 (SDSS DR7) 3".87 in pa 232.7, epoch 1999.2183 (SDSS DR7) --- V = 10.7 + 16? (published V for primary, estimated for secondary guided by SDSS images/photometry) --- spectral type K5V (1972AJ.....77..486U, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 383 cpm companion Date: Wed, 02 Feb 2011 22:19:28 -0700 A good cpm pair. UGP 383 = BD-04 3974 = TYC 5026-0495-1 = UCAC2 30033326 15 46 50.78 -05 15 23.5 (J2000, UCAc2) --- separation 11".94 in pa 157.0, epoch 1999.153 (2MASS) 11".92 in pa 156.5, epoch 2000.375 (DENIS) 11".98 in pa 157.0, epoch 2003.457 (CMC14) --- V = 10.2 + 16.0 (published V for primary, adjust UCAC3 for companion --- spectral type K2V (1972AJ.....77..486U, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 428 cpm companion Date: Thu, 03 Feb 2011 09:15:45 -0700 Another nice one, easy to spot comparing POSS-I/II. Unless the spectral type is significantly in error (probably not), then the Hipparcos parallax is much too small. Hip2 pi = 8 +/- 3 mas, but is actually probably something like 20-25 mas --- roughly Hyades distance, but at mag 11+, probably just too faint for the instrument. UGP 428 = BPM 78313 = TYC 5624-0107-1 = UCAC2 27117918 16 12 41.93 -13 18 56.3 (J2000, UCAC2) --- separation 8".63 in pa 130.0, epoch 1999.301 (2MASS) 8".65 in pa 130.2, epoch 2000.392 (DENIS) 8".58 in pa 130.6, epoch 2002.452 (CMC14) --- V = 11.0 + 15.3 (ASAS-3 V for primary, adjusted UCAC3 for companion) --- spectral type K3V (1972AJ.....77..486U, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 434 cpm companion Date: Thu, 03 Feb 2011 09:30:35 -0700 Easy to spot comparing POSS-I/II. UGP 434 = HD 156517 = TYC 5066-1140-1 = UCAC2 31356986 17 18 04.96 -01 17 06.0 (J2000, UCAC2) --- separation 9".23 in pa 165.0, epoch 1999.227 (2MASS) 8".91 in pa 164.5, epoch 2000.320 (DENIS) --- V = 9.5 + 15.2 (published V for primary, adjusted UCAC3 for companion) --- spectral type K3V (1972AJ.....77..486U, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 482 companion Date: Thu, 03 Feb 2011 10:58:33 -0700 The WDS shows a pair here (WDS 19578-2132 = Cri 25) with 8" separation in pa 138 for 1977. If the identification is correct, then it seems the pa is flipped 180 deg, and the fainter star (on the NW in 1977) is optical, and now located nearly due north of the fast-moving primary. However, the 2MASS images show a red star closer to the northwest that is not present at the 2MASS location on the POSS-I plates. UGP 482 = WDS 19578-2132 = BD-21 5582 19 57 47.63 -21 31 36.4 (J2000, UCAC2) --- AC: 3".5 in pa 330, epoch 1999.512 (estimate from 2MASS images) --- V = 10.8 + 16? (published V for primary, a guess for secondary) --- spectral type K3V (1972AJ.....77..486U) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 488 companion Date: Thu, 03 Feb 2011 11:10:01 -0700 Another case where there's no direct evidence of common motion. UGP 488 = HD 189987 = TYC 5172-0488-1 = UCAC2 29741521 20 03 05.27 -06 17 16.9 (J2000, UCAC2) --- separation 4".7 in pa 170, epoch 1999.370 (estimate from 2MASS) --- V = 9.6 + 16 ? (published V for primary, a guess for secondary) --- spectral type K5V (1972AJ.....77..486U, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 491 companion Date: Thu, 03 Feb 2011 16:06:39 -0700 Another case where the small motion precludes direct evidence of the linkage, but the color of the companion is consistent with an M dwarf together with the K-dwarf primary. UCAC3 shows similar motion, but the solution for the secondary is weak. UGP 491 = TYC 5740-2548-1 = UCAC2 28637703 20 12 37.86 -09 04 07.9 (J2000, UCAC2) --- separation 8".50 in pa 40.7, epoch 1999.578 (2MASS) 8".43 in pa 39.4, epoch 2003.288 (CMC14, n=4) --- V = 10.6 + 14.3 (ASAS-3 V for primary, adjusted UCAC3 for companion) --- spectral type K7V (1972AJ.....77..486U, primary only; also K4/5 from Stephenson (1986AJ.....91..144S) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: WDS 21573-3418 third cpm? companion Date: Fri, 04 Feb 2011 21:46:26 -0700 The available astrometry is a little sketchy, but the 2MASS color for the companion is consistent with an M dwarf as expected from the delta-mag. UGP 543 = WDS 21573-3418 = CD-34 15340 = CPD-34 9028 = TYC 7491-1164-1 = UCAC2 17399575 21 57 17.20 -34 18 21.4 (J2000, UCAC3) --- C comp = 3UC 112-493805 --- separation AC: 13".65 in pa 153.4, epoch 2000.0 (UCAC3) 13".59 in pa 153.4, epoch 1999.687 (2MASS) 13".54 in pa 153.7, epoch 1998.531 (DENIS) 13".01 in pa 155.2, epoch 1976.635 (GSC-ACT) 13".05 in pa 153.6, epoch 1975.74 (Rousseau) --- V = 10.5 + 16.2 (published V for primary, adjusted UCAC3 for companion --- spectral type K5V (1972AJ.....77..486U, primary only) --- USNO-Flagstaff pixel-server has the Whiteoak Extension plate scanned (epoch 1964.754), which suggests the common motion more strongly by comparison with the epoch 1990.77 UK Schmidt exposure; alas there is no star catalogue from the Whiteoak plates =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 555 cpm companion Date: Fri, 04 Feb 2011 22:10:47 -0700 This companion comes up on the far-red DSS and 2MASS images; common motion is clear. UGP 555 = HD 211723 = TYC 7502-0056-1 = UCAC2 16084960 22 19 52.59 -37 16 31.5 (J2000, UCAC2) --- separation 4".53 in pa 330.6, epoch 1998.682 (2MASS) --- V = 10.2 + 16 ? (published V for primary, a guess for secondary) --- spectral type K5V (1972AJ.....77..486U) K3V (1982MSS...C03....0H) K5.5V (2006AJ....132..161G) ...all primary only =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: jack@stsci.edu Subject: UGP 619 2MASS estimate [last of these, plus UGP 175 below] Date: Fri, 04 Feb 2011 22:57:10 -0700 WDS 23502-2924 = B 620 This has only a single night (evidently) by van den Bos from 1927 shown in the WDS (2".5, pa 9). It appears to be real, and the companion is just visible, though not clear, in the 2MASS images. A rough estimate from the J-band image gives 2".7 in pa 23 (epoch 1998.854), surely uncertain by at least a few tenths of an arcsec. It does seem as though the position angle has increased a bit since 1927. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 51743 cpm companion Date: Sat, 05 Feb 2011 00:54:25 -0700 OK, back to trawling through the 'Cape Faint' catalogue again. I have this one already marked in my spectral types file, but evidently it is not in the WDS. HD 51743 = TYC 8121-1353-1 = UCAC2 11695556 6 56 14.55 -46 59 17.7 (J2000, UCAC2) --- separation 22".32 in pa 80.3, epoch 1899.954 (AC2000) 22".09 in pa 81.9, epoch 1976.909 (GSC-ACT) 22".21 in pa 79.9, epoch 1980.119 (GSC-ACT) 22".16 in pa 78.9, epoch 1999.255 (2MASS) --- V = 9.8 + 12.4 (Tycho-2/ASAS-3 for primary, adjusted UCAC3 for companion) --- spectral type G3V (1978MSS...C02....0H), primary only --- UCAC3 motion for secondary is wrong, UCAC2 okay =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SDSS J120816.89+084528.1 is cpm pair Date: Sat, 05 Feb 2011 14:23:16 -0700 Happened to notice that this star in a recent paper has a known fairly close white dwarf companion, and a more distant, brighter star shares common motion. SDSS J120815.59+084543.0 = USNO-B1.0 0987-0220810 12 08 15.63 +08 45 43.3 (J2000, USNO-B1.0) --- B comp = SDSS J120816.83+084527.6 --- AB: 24".02 in pa 128.7, epoch 2000.0 (USNO-B1.0) 23".74 in pa 128.5, epoch 1955.281 (POSS-I via APM) --- V = 18.4 + 20.7 (SDSS g+r/2) --- spectral types: A early K (estimate from Sloan gri colors) B M9e (2008AJ....135..785W) M9 (2010MNRAS.404.1817Z) DA (2010ApJS..190...77K) ...it seems the relative magnitudes aren't quite right if the A component is an ordinary K dwarf. It is quite faint toward the red, and barely shows on 2MASS images (not in the catalogue at all). So the only thing I can think of is that it must be a cool degernerate star as well, but still ought to be several magnitudes brighter than the dM + DA binary. Despite the strong link via proper motions, I'm not sure what's going on here. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: CPD-50 1115 companion Date: Sat, 05 Feb 2011 19:29:04 -0700 The companion here comes up on the DSS far-red and 2MASS images. CPD-50 1115 = CD-50 2505 = TYC 8126-0195-1 = UCAC2 09877238 6 59 44.83 -50 33 49.4 (J2000, UCAC2) --- separation 4".48 in pa 215.8, epoch 1999.882 (2MASS) --- V = 10.0 + 16 ? (ASAS-3 for primary, a guess for secondary) --- spectral type G5 (Cape Faint, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CPD-44 1297 cpm companion Date: Sun, 06 Feb 2011 12:19:29 -0700 Maybe just a coincidence, but looks pretty good. CPD-44 1297 = CD-44 3166 = TYC 7641-2168-1 = UCAC2 12604627 7 08 52.86 -44 51 42.5 (J2000, UCAC2) --- B comp = UCAC2 12604620 --- separation 100".66 in pa 194.1, epoch 1980.119 (GSC-ACT) 101".06 in pa 194.1, epoch 1980.601 (USNO-A2.0) 100".66 in pa 194.1, epoch 1998.252 (DENIS) 100".58 in pa 194.1, epoch 1998.457 (DENIS) 100".73 in pa 194.3, epoch 1999.266 (2MASS) 100".73 in pa 194.2, epoch 2000.0 (PPMXL) 100".65 in pa 194.2, epoch 2000.0 (UCAC2) 100".67 in pa 194.1, epoch 2000.0 (UCAC3) --- V = 10.0 + 14.5 (ASAS-3/Tyc2 for primary, adjusted UCAC3 for companion) --- spectral type K0 (Cape Faint catalogue, primary only); 2MASS J-K and delta-mag for secondary consistent with mid/late-G dwarf (versus K0 giant for primary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CPD-73 654 is cpm pair Date: Sun, 06 Feb 2011 21:13:27 -0700 This is the first of a new series for pairs noticed while cleaning up the spectral survey by Stock & Wroblewski (variously 1972POAN....2...59S = 1972PDAUC...2c..59S, hereafter SW72; the SIMBAD acronym for the stars is for the form SOPS Ra-NNN, where 'R' is a Roman numeral I to V, followed by a letter a to g, then a running serial number -- try to avoid these). I first worked this over in 1998, but didn't really have the catalogue tools available for a good job until 2006, when the revision was completed. Though they stumbled upon several good pairs, their plates didn't resolve any of them, mainly leading to incorrect spectral classifications. This first one is a typical example. CPD-73 654a = TYC 9221-1717-1 = UCAC2 00944128 9 48 20.61 -73 45 24.7 (J2000, UCAC2) --- B comp = UCA2 00944127 --- separation 7".32 in pa 350.8, epoch 2000.0 (UCAC2) 7".58 in pa 352.1, epoch 1912.8 (AC2000, N.B somewhat different epochs) --- V = 11.5 + 12.8 (Tycho-2 for primary, adjusted UCAC3 for companion) --- spectral type F3 (SW72, primary only; they call this a luminosity class I supergiant, but this is almost certainly caused by the overlapping spectra, and the proper motion implies these must be dwarfs) --- cf UCAC2/3 proper motions =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CPD-73 689 is cpm pair Date: Sun, 06 Feb 2011 21:24:52 -0700 The next SW72 pair also has parallel motion in UCAC2, but UCAC3 appears to be inconsistent. CPD-73 689 = TYC 9222-1825-1 = UCAC2 00945440 10 08 35.46 -73 53 23.0 (J2000, UCAC2) --- B comp = UCAC2 00945445 --- separation 17".49 in pa 72.7, epoch 2000.0 (UCAC2) 17".32 in pa 73.2, epoch 1976.255 (GSC-ACT) 17".44 in pa 72.9, epoch 1911.4 (AC2000, N.B. somewhat different epochs) --- V = 11.4 + 13.1 (Tycho-2 for primary, adjusted UCAC3 for companion) --- spectral type F2 (SW72; again given erroneously as a class Ib supergiant) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 17041-6228 = TDS 849 error Date: Sun, 06 Feb 2011 21:59:29 -0700 The single Tycho observation for this pair is incorrect: the pair is much wider, the position-angle is wrong, and the magnitudes are more nearly equal. This is easy to see since the DSS and 2MASS images bracket the Hip/Tyc in epoch, but there is no change in position. UCAC3 has the stars in the correct positions, but the motions must be suspect. Reckoning from the UCAC3 magnitudes: CPD-62 5482 = TYC 9043-1627-1 = 3UC 056-390867 17 04 06.12 -62 28 13.4 (J2000, UCAC3) --- B comp = 3UC 056-390865 --- separation 3".79 in pa 337.0, epoch 1923.4 (AC2000, slightly different epochs) 4".87 in pa 346.5, epoch 1974.42 (Rousseau) 4".94 in pa 336.7, epoch 2000.0 (UCAC3) 4".41 in pa 336.9, epoch 2000.342 (2MASS) ...the AC shows n=1 for the A component, and relatively large errors on the B comp, so perhaps there is some mixing of the individual observations --- V = 11.0 + 11.2 (ASAS-3 combined V, UCAC3 delta-mag) --- spectral type K (SW72, combined light); the 2MASS J-K's are consistent with G/K dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, thenry@chara.gsu.edu Subject: NLTT 112-52 is cpm trio (nearby?) Date: Sun, 06 Feb 2011 22:57:54 -0700 This is a surprising one (that it's not already catalogued), given the large motion and HIP entry (though not actually observed by the spacecraft). UCAC3 has it resolved, so this is confirmed. Interestingly, a third star is involved, but it is not 3UC 047-299573, which does not exist. The UCAC3 proper motion is wrong; it is instead much faster than it shows, and aimed nearly due south. USNO-B1.0 looks correct: -70, -468 mas/year. NLTT 112-52 = HIP 86257 = AC2000 4561234 = 2MASS J17373235-6634238 17 37 32.36 -66 34 23.8 (J2000, 2MASS) --- AB: 2".12 in pa 49.8, epoch 2000.0 (UCAC3) ...this might not be too good since no motion is given for the northeastern component; it's in the ballpark however AC: 70".51 in pa 351.5, epoch 2000.345 (2MASS) 70".55 in pa 351.6, epoch 2000.329 (DENIS, probably ABxC) 70".58 in pa 351.3, epoch 1978.577 (GSC-ACT, surely ABxC) --- AB: V = 11.6 + 11.6 (ASAS-3 combined V, delta-mag = 0 assumed) AC: V = 11.6 + 14.5 (...uncertain estimate for C) --- spectral type M (SW72, 1972POAN....2...59S, combined light) --- J-K = 0.84 for the AB pair, and 0.85 for C. If we take Mv = 10.0 for A and B (i.e. about type M2), then the stars are at 21pc; if they are as early as M0, they're at 35pc. thus the trio are fair candidates for "new" nearby stars. From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: thenry@chara.gsu.edu Subject: Re: NLTT 112-52 is cpm trio (nearby?) Date: Sun, 06 Feb 2011 23:51:54 -0700 Tried to piece together existing DENIS, 2MASS, ASAS-3, and Schmidt plate photometry to get a better estimate of the distance. I worked from Sandy Leggett's nice paper for this (1992ApJS...82..351L). Needs "real" data (and spectra!), but a rough guess is that the brighter AB pair are each type M1, and the fainter distant companion is around M4 (don't quote these!). These are reasonably consistent, and puts the system right at the 25pc "nearby" radius. SIMBAD is surprisingly silent on the stars, and not much besides the astrometry in VizieR. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: TYC 9447-0859-1 cpm? pair Date: Mon, 07 Feb 2011 21:20:13 -0700 This Stock & Wroblewski object is at least a matched pair in color and magnitude. It is a little too faint to appear in the Cape or Cordoba Durchmusterungen. The slightly fainter northern component is listed in Tycho-2. AC2000 4550949 = 3UC 026-055117 = 2MASS J16465967-7726571 16 46 59.68 -77 26 57.2 (J2000, 2MASS) --- B comp = TYC 9447-0859-1 --- separation 4".78 in pa 359.1, epoch 1894.287 (AC2000) 5".64 in pa 357.8, epoch 1996.323 (DENIS) 5".61 in pa 357.8, epoch 1998.775 (DENIS) 5".66 in pa 357.7, epoch 2000.296 (2MASS) --- V = 11.7 + 12.1 (ASAS-3 combined V = 11.17, UCAC3 delta-mag) --- given as type Ap by SW72, but 2MASS J-Ks suggest mid-F dwarfs --- UCAC3 proper motions are spurious 'radial' motions; the simple difference 2MASS minus AC2000 for the southern component is only 2".63 ---> only 25 mas/year =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-29 15541 is cpm pair Date: Mon, 07 Feb 2011 22:09:22 -0700 This pair clearly have common motion. Reported previously by Rousseau, and it is a UCAC3 5,6 pair. CD-29 15541 = UCAC2 19776009 = 3UC 122-570577 18 56 55.08 -29 10 22.0 (J2000, UCAC2) --- B comp = UCAC2 19776008 = 3UC 122-570575 --- separation 8".13 in pa 359.6, epoch 1913.641 (AC2000) 8".02 in pa 359.6, epoch 1998.526 (2MASS) 8".06 in pa 359.3, epoch 2000.0 (UCAC2) 8".04 in pa 359.3, epoch 2003.487 (CMC14) --- V = 11.7 + 11.8 (ASAS-3 combined V = 11.04, UCAC3 delta-mag) --- spectral type F (SW72) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-35 13680 is cpm pair Date: Mon, 07 Feb 2011 22:30:41 -0700 This one is clear from the modest motion amongst the POSS I-II images. Also reported by Rousseau, but their relative coords are poor (7".3 separation). UCAC3 motions are incorrect. CD-35 13680 = CPD-35 8641 = TYC 7434-1432-1 19 45 54.22 -35 20 43.1 (J2000, 2MASS) --- separation 5".38 in pa 356.5, epoch 1913.680 (AC2000) 5".50 in pa 350.0, epoch 2000.602 (2MASS) --- V = 11.0 + 11.0 (ASAS-3 combined V = 10.26, delta-mag = 0.0) --- spectral type K (SW72, combined light); 2MASS colors indicate dwarfs near K0 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-33 13354 is cpm pair Date: Mon, 07 Feb 2011 23:32:39 -0700 Stock & Wroblewski claim this is a T Tauri-type star, but the colors are too blue, and they have not been found as emission-line K stars in other surveys. The error was almost certainly caused by the overlapping spectra of the unrecognized double. CD-33 13354 = TYC 7398-1885-1 = UCAC2 17590110 18 34 37.48 -33 37 42.5 (J2000, UCAC2) --- separation 13".56 in pa 359.2, epoch 2000.583 (2MASS) 13".56 in pa 359.1, epoch 2000.0 (UCAC2) 13".28 in pa 359.5, epoch 1987.377 (GSC-ACT) 13".26 in pa 359.0, epoch 1912.929 (AC2000) --- V = 11.8 + 11.8 (ASAS-3 combined V = 11.05, delta-mag = 0) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SOPS IIg-15 is cpm pair Date: Mon, 07 Feb 2011 23:42:22 -0700 This SW72 star is another N-S pair with common motion. It is too faint to appear in the DM catalogues or Tycho-2. UCAC2 11866214 = 3UC 087-357820 = 2MASS J17531156-4649459 17 53 11.56 -46 49 46.1 (J2000, UCAC2) --- separation 11".25 in pa 0.0, epoch 2000.0 (UCAC2) 11".27 in pa 0.0, epoch 1999.550 (2MASS) 10".98 in pa 0.0, epoch 1987.298 (GSC-ACT) 11".46 in pa 359.5, epoch 1905.302 (AC2000) --- V = 12.6 + 12.6 (ASAS-3 combined V = 11.88, delta-mag = 0) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SOPS IIIa- 98 is cpm pair Date: Thu, 10 Feb 2011 12:28:31 -0700 A brief break in the asteroid realm, so one more Stock & Wroblewski pair. Again this a case where the N-S overlap of the objective-prism images caused them to suspect the star was peculiar, but is actually just a wide pair. SOPS IIIa- 98 = UCAC2 17191934 = 2MASS J06133846-3403174 6 13 38.47 -34 03 17.5 (J2000, UCAC2) --- B comp = UCAC2 17191935 --- separation 19".08 in pa 9.0, epoch 1978.5 (GSC-ACT, n=2) 19".26 in pa 8.4, epoch 1994.997 (GSC-2.3) 19".24 in pa 8.6, epoch 1999.800 (2MASS) 19".26 in pa 8.9, epoch 2000.0 (UCAC2) --- V = 13.0 + 14.1 (UCAC3 taken as V) --- spectral type F0 (SW72, primary only) --- color/delta-mag consistent with physical pair of F+G dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SOPS IIIc- 67 is cpm pair Date: Thu, 10 Feb 2011 22:11:48 -0700 This has modest common proper motion, and is another case where the N-S overlap of images caused Stock & Wroblewski to flag it as peculiar (i.e. they did not recognize that it is double). SOPS IIIc- 67 = TYC 8560-0418-1 = UCAC2 06732196 7 38 42.08 -57 17 12.8 (J2000, UCAC2) --- B comp = UCAC2 06732197 = 3UC 066-024882 --- separation 12".29 in pa 0.3, epoch 2001.123 (2MASS) 12".29 in pa 0.4, epoch 2000.0 (UCAC2) 12".26 in pa 0.3, epoch 1998.909 (DENIS) 12".23 in pa 0.3, epoch 1996.060 (DENIS) 12".56 in pa 359.6, epoch 1974.97 (Rousseau) 11".51 in pa 1.4, epoch 1898 (AC2000, N.B.somewhat different epochs, probably individual meas better) --- V = 11.8 + 12.6 (ASAS-3 combined V = 11.42, ASAS-3 delta-mag) --- spectral type F (SW72, combined light) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SOPS IIIc-108 is cpm pair Date: Thu, 10 Feb 2011 22:30:24 -0700 Another N-S pair with clear common motion. SOPS IIIc-108 = TYC 8919-0735-1 = UCAC2 03236517 7 54 48.45 -64 58 32.0 (J2000, UCAC2) --- B comp = TYC 8919-1476-1 = UCAC2 03236514 --- separation 16".57 in pa 351.6, epoch 2000.016 (2MASS) 16".63 in pa 351.6, epoch 2000.0 (UCAC2) 16".63 in pa 351.7, epoch 1996.085 (DENIS) 16".73 in pa 350.3, epoch 1975.93 (Rousseau) 16".60 in pa 350.2, epoch 1911.5 (AC2000, N.B. somewhat different epochs) --- V = 11.7 + 12.3 (ASAS-3 combined V = 11.23, ASAS-3 delta-mag) --- spectral type F (SW72, combined light) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, jack@stsci.edu Subject: CD-59 1828 is cpm pair Date: Thu, 10 Feb 2011 22:55:55 -0700 Somehow I overlooked this one amongst the Upgren et al dwarfs, but here it is again in the Stock & Wroblewski list --- they recorded only the primary. CD-59 1828 = UGP 175 = TYC 8578-1283-1 = UCAC2 05755261 8 05 40.04 -59 25 26.0 (J2000, UCAC2) --- primary not in CPD --- B comp = UCAC2 05755257 --- separation 19".81 in pa 229.1, epoch 2000.085 (2MASS) 19".77 in pa 228.9, epoch 2000.0 (UCAC2) 19".78 in pa 229.0, epoch 1998.424 (DENIS) 19".91 in pa 228.6, epoch 1977.218 (GSC-ACT) 19".54 in pa 228.8, epoch 1975.210 (Rousseau) --- V = 10.4 + 12.0 (Tycho-2 V for primary, adjusted UCAC2 for comp) --- spectral type K5V (1972AJ.....77..486U, primary only) K6V (2006AJ....132..161G, primary only) ...2MASS J-K for secondary consistent with M dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SOPS IIIf- 44 is 2" pair Date: Thu, 10 Feb 2011 23:13:25 -0700 This one much closer than I usually noticed, but the two components are shown separately in 2MASS (perhaps not a great measure, however). SOPS IIIf-44 = GSC 7071-0614 = 3UC 118-020248 = 2MASS J06050616-3117353 6 05 06.2 -31 17 35 (J2000, GSC-ACT center-of-blob) --- separation 1".25 in pa 20.4, epoch 1999.750 (2MASS) 2".1 in pa 28 , epoch 1999.75 (estimate from 2MASS J image) --- various astrometry/photometry flags in 2MASS, so probably a less reliable measure than usual --- V = 13.9 + 14.9 (ASAS-3 combined V = 13.49, estimated delta-mag = 1.0) --- spectral type A/F (SW72, combined light) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CPD-68 1050/51 is cpm pair Date: Thu, 10 Feb 2011 23:39:21 -0700 Another overlapping pair called "peculiar" by S&W. Colors suggest a pair of F stars. CPD-68 1050 = TYC 9210-2339-1 = UCAC2 01955129 10 11 40.00 -68 54 12.6 (J2000, UCAC2) --- B comp = CPD-68 1051 (neither star in CD) --- separation 14".64 in pa 187.9, epoch 2000.022 (2MASS) 14".63 in pa 187.9, epoch 2000.0 (UCAC2) 14".62 in pa 187.9, epoch 1999.016 (DENIS) 14".61 in pa 188.3, epoch 1911.867 (AC2000) --- V = 11.1 + 11.6 (Tycho-2 V for primary, UCAC3 for companion) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09211+4155 = LDS 3878 additional meas Date: Fri, 11 Feb 2011 00:49:40 -0700 This has only the original Luyten observation in the WDS. source rho theta epoch 2MASS 5".18 4.7 1999.222 SDSS DR7 5".25 8.4 2001.9694 The companion is rather faint in the 2MASS images --- evidently not especially red, so the measurement is probably less good than the SDSS result. If the SDSS photomtery is correct, the secondary is about V = 18.9. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: SOPS IVa- 19 is cpm pair Date: Fri, 11 Feb 2011 20:53:41 -0700 Another small-motion pair; this was misinterpreted as a supergiant by Stock & Wroblewski. SOPS IVa- 19 = UCAC2 21105255 = 2MASS J15154888-2608460 15 15 48.90 -26 08 46.1 (J2000, UCAC2) --- B comp = UCAC2 21105257 --- separation 14".89 in pa 174.4, epoch 2003.285 (CMC14) 14".89 in pa 174.3, epoch 2000.0 (UCAC2) 14".90 in pa 174.1, epoch 1999.236 (2MASS) 14".73 in pa 174.7, epoch 1991.288 (GSC-2.3) 14".63 in pa 174.7, epoch 1976.4 (GSC-ACT, n=2) --- V = 13.0 + 13.9 (ASAS-3 combined V = 12.56, UCAC3 delta-mag) --- spectral type A5 (SW72) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-38 7621 is cpm pair Date: Fri, 11 Feb 2011 21:30:44 -0700 This is a large-proper-motion M dwarf pair. The companion is visible on the DSS images, so the common motion is obvious, but resolved only in 2MASS. CD-38 7621 = TYC 7756-1167-1 = UCAC2 15046065 = 2MASS J12174675-3904047 12 17 46.75 -39 04 05.0 (J2000, UCAC2) --- separation 4".16 in pa 335.7, epoch 1999.266 (2MASS) --- V = 11.2 + 14 (ASAS-3 V for primary, estimated delta-mag = 3); also Geneva photometry gives V = 11.16 --- spectral type M (SW72) --- Hip2 parallax = 32.4 mas, so about 31pc away [pa typo corrected 2011 Feb 17] =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-42 9515 is cpm pair Date: Fri, 11 Feb 2011 22:02:05 -0700 Despite the modest motion, the ROSAT detection indicates a young T Tauri star for the primary, and those often have companions, which was easily spotted here on images and in catalogues. CD-42 9515 = TYC 7818-0189-1 = UCAC2 13367216 14 38 54.41 -43 10 22.2 (J2000, UCAC2) --- separation 30".05 in pa 35.3, epoch 2000.0 (UCAC3) 30".31 in pa 35.6, epoch 1999.383 (2MASS) 30".21 in pa 35.7, epoch 1998.465 (DENIS) 30".69 in pa 35.6, epoch 1980.817 (USNO-A2.0) --- V = 11.1 + 16.6 (ASAS-3 V for primary, adjusted UCAC3 for comp) --- spectral type K3Ve (2006A&A...460..695T, primary only); companion 2MASS J-K = 0.85, consistent with an M dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-46 8854 is cpm pair Date: Fri, 11 Feb 2011 22:18:18 -0700 These don't seem to have moved much relative to each other since 1904 despite ~3".5 of sky motion. CD-46 8854 = CPD-46 6490 = UCAC2 11775441 = 2MASS J13471362-4639483 13 47 13.62 -46 39 48.5 (J2000, UCAC2) --- B comp = UCAC2 11775442 --- separation 9".17 in pa 0.3, epoch 2000.0 (UCAC2) 9".13 in pa 0.1, epoch 1999.394 (2MASS) 9".16 in pa 0.3, epoch 1996.386 (DENIS) 8".88 in pa 0.7, epoch 1903.919 (AC2000) --- V = 11.6 + 12.1 (ASAS-3 combined V = 11.05, UCAC3 delta-mag) --- spectral type F (SW72) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, thenry@chara.gsu.edu Subject: SOPS IVf-23 is cpm pair Date: Fri, 11 Feb 2011 22:54:15 -0700 This nearby large-motion WD+DM pair seems to have been noticed by Subasavage et al (2007AJ....134..252S), but is not present in the WDS. It evidently lies not far outside the 25pc "nearby" radius. SOPS IVf-23 = SCR J1107-3420A = 3UC 112-134419 = 2MASS J11074788-3420512 11 07 47.90 -34 20 51.5 (J2000, Yale SPM) ...this is the white dwarf --- WD star is called SCR J1107-3420A in SIMBAD, but there is no entry for the M dwarf --- B comp (M dwarf) = 2MASS J11075025-3421003 --- separation 30".62 in pa 107.2, epoch 1999.197 (2MASS) 30".59 in pa 107.4, epoch 1999.307 (DENIS) 30".49 in pa 107.1, epoch 1992.314 (GSC-2.3) --- V = 13.7 + 15.0 (Subasavage V for primary, GSC-2.3 b+r/2 for comp) --- spectral types DA (1972POAN....2...59S) DA3.5 (2007AJ....134..252S) ...both primary only; companion 2MASS J-K = 0.86, consistent with M dwarf =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: thenry@chara.gsu.edu Subject: CD-44 8852 is cpm pair [last of SW72 series] Date: Fri, 11 Feb 2011 23:14:02 -0700 Another easy one, evidently overlooked by Luyten, though he may have only cribbed the old 'Cape Faint' catalogue for the motion on this one, and thus missed the companion. The companion does appear in UCAC3 and antecedents, but there doesn't seem to be anything else in VizieR or SIMBAD. CD-44 8852 = LTT 5330 = 3UC 089-164404 = 2MASS J13445511-4535187 13 44 55.12 -45 35 18.8 (J2000, 2MASS) --- B comp = 2MASS J13445742-4535376 --- separation 30".80 in pa 127.4, epoch 2000.0 (UCAC3) 30".72 in pa 127.8, epoch 1999.394 (2MASS) 30".73 in pa 127.5, epoch 1998.455 (DENIS) 30".59 in pa 128.0, epoch 1991.225 (GSC-2.3) --- V = 11.3 + 15.1 (ASAS-3 V for primary, GSC-2.3 g+r/2 for comp) --- Stock & Wroblewski call this spectral type 'S', which is wrong; 2MASS J-K = 0.82 for primary, suggesting maybe an M0 dwarf --- putting it at about 30pc =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-47 2968/69 is cpm pair Date: Sun, 13 Feb 2011 21:09:54 -0700 The previous pair sent a few days ago, involving CD-44 8852, was the last of the useful pairs found in the Stock & Wroblewski list. Back to the 'Cape Faint' catalogue for now. The various proper-motion sources seem to agree on this next one. CD-47 2968 = CPD-47 1253 = TYC 8124-1514-1 = UCAC2 11474123 7 18 58.28 -47 23 29.7 (J2000, UCAC2) --- B comp = CD-47 2969 = CPD-47 1254 = TYC 8124-2210-1 --- separation 45".08 in pa 83.9, epoch 2000.0 (UCAC2) 45".12 in pa 83.9, epoch 2000.0 (UCAC3) 45".11 in pa 83.9, epoch 1999.236 (2MASS) 45".00 in pa 84.1, epoch 1996.115 (DENIS) 45".07 in pa 83.9, epoch 1980.142 (USNO-A2.0) 44".84 in pa 83.7, epoch 1980.119 (GSC-ACT) 45".16 in pa 83.8, epoch 1978.168 (GSC-ACT) 45".05 in pa 84.5, epoch 1978.015 (GSC-ACT) 44".71 in pa 83.8, epoch 1976.909 (GSC-ACT) 45".23 in pa 84.1, epoch 1904.192 (AC2000) ...the four GSC measures are clearly from overlapping plates, and might usefully be averaged to 44".94 in pa 84.0, and epoch 1978.3; the A2.0 measure I assume includes some "best" blue plate and red plate with the mean epoch given. UCAC3 has a somewhat different mix of source data, such as SuperCOSMOS rather than USNO plate-scans, and excludes AC2000 for the secondary. alas, only the primary is in the CPC2, so no good observation between the AC and the later Schmidt plates. the consistency between the AC2000 and UCAC2 etc is convincing, given the ~3".5 sky motion over the 95-year interval. --- V = 10.4 + 11.9 (Tycho-2 V for primary, ASAS-3 for secondary) --- spectral type F5 ('Cape Faint', primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 07211-4125 = Rst 2472 additional meas Date: Sun, 13 Feb 2011 22:15:21 -0700 I have this flagged as a trio in my big file, and it seems the more distant third star has a fair chance of being related per delta-mag and 2MASS color. It also seems like the DENIS catalogue might record the B component approximately. The measurements of the AC pair are somewhat problematic due to the influence of the B component, so they might be semi-ABxC. WDS 07211-4125 = Rst 2472 AB: 2".10 in pa 142.9, epoch 1996.044 (DENIS) ...implied motion contrary to WDS trend, however AC (new): 9".39 in pa 207.6, epoch 1976.16 (Rousseau) 9".08 in pa 203.4, epoch 1996.044 (DENIS) 8".82 in pa 211.4, epoch 1999.967 (2MASS) 8".84 in pa 209.2, epoch 2000.0 (UCAC3) ...the 2MASS and UCAC3 measures are probably from a weighted photo-center for ABxC, DENIS might be correct, and the Rousseau measure from the ESO 'Quick Blue' plate is probably simply somewhat uncertain --- V = 10.1 + 13.5 (Tycho-2 for primary, adjusted UCAC3 for comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00262+0028 = WDS 00260+0027 Date: Fri, 18 Feb 2011 20:01:22 -0700 Noted this ID while looking over some of the Andrew West faint M-dwarf pairs I reported. Looks as though Saurav Dhital picked this one up also. WDS 00262+0028 = SLW 21 = WDS00260+0027 = GRV 974 --- additional earlier measures: source rho theta epoch USNO-A2.0 15".88 204.7 1952.705 GSC-2.3 15".77 204.7 1987.642 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10180+0721 = Far 11 AC additional meas Date: Thu, 24 Feb 2011 15:32:58 -0700 These are for the wider pair here reported by Farihi et al, and are probably ABxC except the Sloan measures, as indicated: USNO-A2.0 47.4 38.72 1955.224 GSC-2.3 47.3 37.90 1991.269 CMC14 47.2 37.63 2000.515 n=6 observations SDSS DR7 46.6 37.51 2002.120 AC SDSS DR7 48.1 37.81 2002.120 ABxC The UCAC2 proper motion for AB is +0.6, -25.3, whereas the motion for the isolated C comp in SDSS DR7 is -29, -32 (similar in USNO-B1.0). There is surely some uncertainty in deciding how the closer AB pair balance out in the various catalogues --- they are about equal on the Sloan g image, but the M-dwarf 'B' comp is significantly brighter at Sloan r. Probably need radial velocities to decide whether C is linked or not. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Lepine cpm pair Date: Fri, 25 Feb 2011 14:41:22 -0700 This nice large-motion pair seems to have been overlooked for the WDS. 2MASS J12443211-1306174: 12 44 32.12 -13 06 17.5 (J2000, 2MASS) --- called PM I12445-1306N/S by Lepine in 2008AJ....135.2177L source theta rho epoch USNO-A2.0 210.3 9.51 1954.392 USNO-A2.0 211.6 9.62 1956.267 GSC-2.3 211.0 10.30 1982.398 GSC-2.3 211.1 10.17 1992.393 SDSS DR7 211.1 10.21 1994.326 2MASS 211.1 10.22 1998.211 DENIS 211.4 10.22 1998.482 Lepine 211.0 10.23 2000.0 CMC14 211.5 10.18 2003.134 --- V = 14.6 + 15.1 (ASAS-3 combined V=14.07, CMC14 delta-mag, consistent with SDSS g+r/2) --- 2MASS J-K colors suggest late-K dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Lepine PM I17084-2209 cpm pair Date: Fri, 25 Feb 2011 15:00:20 -0700 Another fainter, closer pair from the same Lepine paper. 2MASS J17082559-2209240: 17 08 25.59 -22 09 24.1 (J2000, 2MASS) --- called PM I17084-2209W/E by Lepine in 2008AJ....135.2177L source theta rho epoch 2MASS 130.6 4.09 1998.413 Lepine 130.3 4.13 2000.0 --- V = 16.5 + 17.5 (estimates) --- 2MASS J-K colors suggest late-K dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Lepine PM I18292-3059 cpm pair Date: Fri, 25 Feb 2011 15:17:37 -0700 The third (and final) cpm pair from the 2008 Lepine paper. 2MASS J18291690-3059489: 18 29 16.90 -30 59 48.9 (J2000, 2MASS) --- called PM I18292-3059N/S by Lepine in 2008AJ....135.2177L source theta rho epoch DENIS 200.4 7.19 1998.528 2MASS 200.7 7.21 1999.507 Lepine 200.7 7.21 2000.0 --- V = 13.8 + 14.8 (ASAS-3 combined V=13.44, UCAC3 delta-mag) --- 2MASS J-K colors suggest late-K dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: HD 59659 + CD-48 2972 cpm pair Date: Sat, 26 Feb 2011 13:03:54 -0700 This wide pair shares common motion, and the delta-magnitudes are consistent with the spectral types. HD 59659 = CD-48 2974 = UCAC2 10572078 7 28 30.06 -49 08 58.9 (J2000, UCAC2) --- B comp = CD-48 2972 = CPD-48 1185 --- separation 81".64 in pa 285.0, epoch 2000.038 2MASS 81".66 in pa 285.1, epoch 2000.0 UCAC2 81".57 in pa 285.1, epoch 1997.192 DENIS 81".30 in pa 285.1, epoch 1978.015 GSC-ACT 81".76 in pa 285.3, epoch 1901.248 AC2000 --- V = 8.8 + 9.9 (Tycho-2) --- spectral types F7V + G8V (Houk 1978MSS...C02....0H, Torres 2006A&A...460..695T) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: CD-48 3010 cpm pair Date: Sat, 26 Feb 2011 13:31:27 -0700 This looks like another good one, also recorded as a 5,6 pair in UCAC3. CD-48 3010 = CPD-48 1200 = UCAC2 10795341 7 31 53.08 -48 53 44.4 (J2000, UCAC2) --- separation 7".76 in pa 0.8, epoch 2000.038 (2MASS) 7".83 in pa 1.2, epoch 2000.0 (UCAC2) 7".79 in pa 1.2, epoch 1998.359 (DENIS) 7".79 in pa 1.7, epoch 1997.060 (DENIS) 7".77 in pa 2.7, epoch 1900.490 (AC2000) --- V = 9.9 + 12.8 (Tycho-2 V, adjusted UCAC3 for secondary) --- spectral type F2 ('Cape Faint' catalogue, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: HD 65092 + CD-43 3726 cpm trio Date: Sun, 27 Feb 2011 13:12:56 -0700 The primary has a moderately close companion visible on DSS images, and resolved in 2MASS. The match here for the wide AC pair is partly by spectral type and delta-mag. In any case they seem to be fixed despite 1".0 sky-motion in 100 years. HD 65092 = CD-43 3727 = TYC 7658-005701 = UCAC2 13076018 7 55 11.10 -43 52 32.8 (J2000, UCAC2) AB: separation 5".26 in pa 135.3, epoch 1999.268 (2MASS) V = 8.6 + 14 ? (Tycho-2 V for primary, estimate for secondary) spectral type A3/5III/IV (Houk, primary only) AC: C comp = CD-43 3726 (type F0 in 'Cape Faint' catalogue) V = 8.6 + 9.6 (Tycho-2) available astrometry: source theta rho epoch AC2000 330.5 54.68 1901.149 CPC2 330.6 54.86 1962.08 Rousseau 330.3 54.91 1976.07 GSC-ACT 330.4 54.92 1976.906 DENIS 330.6 54.66 1999.137 2MASS 330.6 54.84 1999.268 UCAC2 330.6 54.80 2000.0 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-48 3568 cpm pair Date: Sun, 27 Feb 2011 21:17:30 -0700 This is a 'Cape Faint' catalogue star that has a companion recorded with a good baseline. Shown as a 5,6 pair in UCAC3, but the proper motions there are 'radial'. CD-48 3568 = CPD-48 1537 = TYC 8144-1296-1 = UCAC2 10803226 8 10 46.72 -48 52 00.0 (J2000, UCAC2) --- separation 8".46 in pa 91.2, epoch 1902.7 (AC2000, slightly different epochs) 8".32 in pa 93.0, epoch 1998.452 (DENIS) 8".26 in pa 93.3, epoch 1999.039 2004MNRAS.351.1401J 8".29 in pa 92.7, epoch 1999.901 (2MASS) 8".30 in pa 92.8, epoch 2000.0 (UCAC2) ...Jeffries et al astrometry done with CTIO 0.9-m + CCD --- V = 10.5 + 13.5 (published V for primary, adjusted UCAC3 for companion); Jeffries et al 2004MNRAS.351.1401J photometry is saturated or crowded --- spectral type F5 ('Cape Faint' catalogue) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: CD-45 4187/88 cpm pair Date: Wed, 02 Mar 2011 00:05:31 -0700 The slightly brighter of these is in the 'Cape Faint' catalogue. CD-45 4187 = CPD-45 2580 = UCAC2 11946045 8 29 58.07 -46 03 48.1 (J2000, UCAC2) --- B comp = CD-45 4188 = CPD-45 2581 --- separation 38".81 in pa 53.9, epoch 1904.711 (AC2000) 38".39 in pa 53.9, epoch 1976.07 (Rousseau) 38".80 in pa 53.6, epoch 1977.046 (GSC-ACT) 38".68 in pa 54.0, epoch 1978.130 (USNO-A2.0) 38".69 in pa 54.1, epoch 1999.244 (2MASS) 38".74 in pa 53.9, epoch 2000.0 (UCAC2) --- V = 10.0 + 10.7 (Tycho-2) --- spectral type F2 ('Cape Faint' catalogue, primary only) Just read the Rousseau paper (1996A&AS..116..301R) to confirm that they used the ESO 'Quick Blue' survey plates for their work. (Too bad those aren't scanned --- they'd help a lot to clean up the Schmidt-based proper-motion catalogues.) They measured objects manually on each plate twice (direct and rotated 90 deg) against Perth 70/FK4 stars. They claim rms scatter on the Perth 70 stars as ~0".25 in each axis (i.e. ~0.35 total), and similar errors wrt the older Carlsberg photoelectric catalogues. Setting accurately on really bright stars like the pair above was probably difficult, so the ~0".35 error here is not too bad. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09022+3841 SDSS meas Date: Fri, 11 Mar 2011 20:31:29 -0700 This one has no WDS observation since 1944. 123.5 3.50 2001.969 SDSS DR7, class 3 'good' 124.3 3.09 2002.106 SDSS DR7, class 2 'acceptable' ...the primary is greatly overexposed of course, so neither of these may be any good. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09134+3131 = Cou 1562 SDSS meas Date: Fri, 11 Mar 2011 20:58:23 -0700 The WDS coordinates are approximate, and SDSS DR7 provides a confirmatory measure. WDS 09134+3131: 9 13 17.30 +31 31 58.8 (J2000, UCAC3) 113.4 2.04 2003.086 SDSS DR7 --- not BD+32 1848 The star 18" NE is BD+32 1848, and if the available measures below for the Couteau pair apply strictly to the photocenter, then it looks as though it is unrelated to the close pair (so please don't make this an SKF pair!). theta rho epoch source 67.0 16.82 1955.227 USNO-A2.0 69.3 17.48 1981.155 ERL, 2001AJ....121.2815D 71.5 17.61 1998.225 2MASS 72.4 17.71 2003.255 CMC14 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09206+0225 = Bal 1860 SDSS meas Date: Fri, 11 Mar 2011 21:10:14 -0700 The first and last of at least four SDSS catalogue records. The primary of course is saturated, so the astrometry may be problematic. theta rho epoch source 131.8 3.84 1995.440 SDSS DR7, class 2 'acceptable' 132.1 3.83 2001.140 SDSS DR7, class 3 'good' =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09261+0842 = Che 135 recent meas Date: Fri, 11 Mar 2011 21:23:05 -0700 This is correctly identified in the WDS, and is resolved in SDSS and UCAC3. theta rho epoch source 114.5 2.67 2000.0 UCAC3 "5,6" pair 115.0 2.70 2003.075 SDSS DR7 --- ASAS-3 combined V = 12.32 and UCAC3 delta-mag (which looks about right) suggest the magnitudes should be 12.7 + 13.5, i.e. UCAC3 mags nearly standard V in this case =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09319+3430 = Es 299 BC isn't/is double Date: Fri, 11 Mar 2011 21:54:34 -0700 The star at this position is not double as described in the WDS. In fact nothing within a 12'x12' box fits the description. However, the star nevertheless has a faint common-motion companion. WDS 09319+3430: not a ~4".5 roughly equal double, but: theta rho epoch source 172.4 18.31 1953.940 USNO-A2.0 171.6 18.40 1998.225 2MASS 171.7 18.38 2003.087 SDSS DR7 --- V = 12.3 + 18.7 (TASS MkIV for primary, SDSS g+r/2 for comp) --- 2MASS J-K consistent with F/G + late-K/M0 dwarfs --- modest proper motions similar, using UCAC2/3 for primary and USNO-B1.0 or SDSS DR7 for companion =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09328+0249 = J2498 recent meas Date: Fri, 11 Mar 2011 22:13:46 -0700 Somewhat wider and fainter than Jonckheere measured it. theta rho epoch source 27.2 5.81 2000.090 2MASS 26.8 5.66 2000.099 CMC14 26.4 5.76 2000.17 UCAC3 27.1 5.81 2000.343 SDSS DR7 --- V = 13.5 + 13.8, assuming ASAS-3 combined V and UCAC3 delta-mag =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09452+4109 AB? recent meas Date: Fri, 11 Mar 2011 22:43:51 -0700 There doesn't seem to be a star fitting Aitken's specs on the SDSS and 2MASS images, but could it be possible that the faint, red companion in the second quadrant might be it? The brighter companion about 15" SW seems at least to be possibly physical. theta rho epoch source AB?: 134.3 3.24 2002.950 SDSS DR7, primary saturated --- SDSS shows V = 15.2 (taken as g+r/2) AC: 231.4 14.64 1983.023 GSC-ACT 232.0 14.87 1998.255 2MASS, pa probably slightly skewed by B comp above 231.6 14.89 2000.0 UCAC2 231.5 14.87 2002.244 CMC14 231.7 14.77 2002.950 SDSS DR7 --- V = 9.8 + 12.6 (Tycho-2/TASS V for primary, adjusted UCAC3 for companion) From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: WDS 09452+4109 AB? recent meas Date: Fri, 11 Mar 2011 23:31:03 -0700 I decided to look at the original ADS for this pair, and noticed the next entry (ADS 7507 = BD+41 2004 = Barnard) bears a striking similarity to Aitken's measures. This would mean his measures are okay, but just apply to the pair 5' SE. N.B. the WDS delta-magnitude for WDS 09457+4104 = Bar 37 is wrong, and matches instead what Aitken shows for BD+41 2002, i.e. 8.6 + 14.0 or however you're adjusting the zero-point. They're nearly equal in the WDS at present. The Barnard pair is more-or-less visible on some of the SDSS images and on 2MASS images. If indeed ADS 7506 = ADS 7507, then the components sent earlier are new, and I don't see any reason not to think that they're related since the colors and/or motions are consistent. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09575+1359 = Hei 59 coords + recent meas Date: Fri, 11 Mar 2011 23:09:46 -0700 The WDS attributes this to the wrong star. The Heintz pair is indeed BD+14 2167. WDS 09575+1359: 9 57 41.91 +14 02 15.8 (J2000, UCAC2) theta rho epoch source 4.9 6.48 1994.257 SDSS DR7, primary saturated 5.2 6.60 2000.101 2MASS 5.0 6.47 2001.145 CMC14 --- V = 11.1 + 13.8 (ASAS-3/TASS V for primary, adjusted UCAC3 for companion) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 22399+6423 = LDS 4990 meas Date: Sat, 12 Mar 2011 18:17:52 -0700 Perusing Steve Levine's paper about high-proper-motion stars in USNO-B1.0 (2005AJ....130..319L): theta rho epoch source WDS 22399+6423: 112.5 50.67 1952.631 USNO-A2.0 112.3 50.80 1991.683 GSC-2.3 112.5 50.72 2003.738 SDSS DR7 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil, sel@lowell.edu Subject: MUSR 61+62 Date: Sat, 12 Mar 2011 19:57:49 -0700 Perusing Steve Levine's paper about high-proper-motion stars in USNO-B1.0 (2005AJ....130..319L), I note the following pair reported by him as probably co-moving that is not present in the WDS: MUSR 61 + MUSR 62: 22 46 09.73 +64 30 23.2 (J2000, 2MASS) theta rho epoch source 321.4 58.88 1952.631 USNO-A2.0 320.7 58.74 1991.559 SuperCOSMOS, POSS-II N plate 320.6 58.79 1991.603 SuperCOSMOS, POSS-II J plate 320.6 58.67 1991.683 GSC-2.3, POSS-II F plate 320.4 58.73 1999.827 2MASS 320.2 58.69 2003.738 SDSS DR7 --- V = 14.0 + 15.8 (TASS MkIV for primary, SDSS DR7 g+r/2 for comp) --- the two stars wouldn't maintain fixed sep/pa for 50 years if the motions (e.g. in this paper and in UCAC3) were as divergent as they seem to be. the difference in the motion is ~22 mas/yr, so after 50 years you'd expect a position difference of ~1".1, which hasn't happened. Lepine & Shara also seem to find the motions to be different, since the primary is in the LSPM while the companion is not. (am I missing something here?) --- 2MASS J-K colors are consistent with mid-K + M dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Cc: sel@lowell.edu Subject: MUSR 81 + 77 + 76 cpm trio Date: Sat, 12 Mar 2011 20:57:59 -0700 A very wide co-moving trio from the Levine paper. The stars have colors and magnitudes consistent with their being all at the same distance, though the brighter component is nearly a degree away. I show coordinates for MUSR 81 and MUSR 77 in case you want to make them separate entries. The separation for MUSR 81/77 follows, which might be called AB, and then the less-wide BC pair. Interestingly, USNO-B1.0 shows only the POSS-I epoch positions for both B and C, presumably from exactly the same scans as USNO-A2.0, but resulting in different relative coordinates. MUSR 81: 23 56 48.63 +79 08 50.4 (J2000, 2MASS) MUSR 77: 23 43 23.68 +78 31 11.4 (J2000, 2MASS) MUSR 81/77: theta rho epoch source 226.1 3255.9 1954.723 USNO-A2.0 226.1 3256.1 1996.640 GSC-2.3 226.1 3256.3 2000.504 2MASS --- V = 16.0 + 17.6 (GSC-2.3 averages) --- 2MASS J-K colors are consistent with ~M0 and early-M dwarfs MUSR 77/76 theta rho epoch source 289.1 396.6 1954.723 USNO-A2.0 289.1 396.9 1954.723 USNO-B1.0 289.1 396.4 1996.640 GSC-2.3 289.1 396.4 2000.504 2MASS --- V = 17.6 + 18.1 (GSC-2.3 averages) --- 2MASS J-K colors are consistent with M dwarfs =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10178+2000 AC recent meas Date: Sun, 13 Mar 2011 13:47:36 -0700 The closer AB component is visible in SDSS images, but not resolved in the catalogue. theta rho epoch source WDS 10178+2000 AC: 194.8 9.66 2000.0 UCAC3 194.5 9.43 2005.189 SDSS DR7 --- the UCAC3 measure has epoch 2000.0 for the primary (reliable), but the UCAC astrograph observation at 2001.05 for the C comp; proper motion is small, so probably doesn't matter --- in SDSS at least the primary is greatly overexposed; for what it's worth, SDSS shows V = 14.4, taken as g+r/2, for the C comp =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10208+5836 recent meas + new comps Date: Sun, 13 Mar 2011 14:21:22 -0700 Examination of this group suggests at least one new "likely" companion to A, and a less likely one to B. theta rho epoch source WDS 10208+5836 BC: 167.0 2.81 2000. UCAC3 minus SDSS DR7 --- SDSS observation epoch 2000.907; the SDSS coords for the bright star are clearly in error due to saturation this one seems to be a likely M dwarf companion to the A comp: WDS 10208+5836 AD: 59.2 5.67 1999.000 2MASS 59.9 6.00 2000.907 SDSS DR7 --- V = 9.6 + 16 ? (estimate for companion) this companion has neutral color, so the connection is not obvious; seems to be fixed at least between POSS-I and recent images, but motions are small for the bright stars: WDS 10208+5836 BE: 287.0 9.32 1999.000 2MASS 285.9 9.32 2000. UCAC3 minus SDS DR7 283.4 9.43 2000. UCAC3 --- V = 10.3 + 15.3 (SDSS DR7 g+r/2 for E comp) --- SDSS observation 2000.907 --- the UCAC3 observation for E is from 2003.19 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10366+7849 B is double Date: Sun, 13 Mar 2011 14:35:34 -0700 The B component of this wide optical pair is double on SDSS and 2MASS images. WDS 10366+7849 BC: 10 36 43.23 +78 48 30.8 (J2000, UCAC3 for B comp) --- separation 2".45 in pa 0.0, epoch 1994.569 (SDSS DR7) --- V = 13.4 + 14.7 (SDSS DR7 g+r/2) --- no substantial change in position-angle between POSS-I (blue) and recent images =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10378+4550 = LDS 4002 not double Date: Sun, 13 Mar 2011 14:44:12 -0700 The star at this position in the WDS, which does have noticeable proper motion, is not a 3" pair on any of the DSS/SDSS/2MASS images. =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10421+0757 = Brt 2151 recent meas Date: Sun, 13 Mar 2011 14:59:37 -0700 Kinda close for both UCAC3 and SDSS, but perhaps better than nothing since AC2000. theta rho epoch source WDS 10421+0757: 57.9 3.27 2000. UCAC3 57.8 2.97 2002.174 SDSS DR7 57.3 3.33 2002.194 SDSS DR7 --- combined V = 11.94 (ASAS-3) and UCAC3 delta-mag gives V = 12.4 + 13.1, not too far from the current values =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10425+3704 = Hu 882 SDSS meas Date: Sun, 13 Mar 2011 15:05:53 -0700 Perhaps closing slightly, although the SDSS _images_ (versus catalogue) are only any good in the u and z filters. WDS 10425+3704: pa 284.8, separation 3".02, epoch 2003.316, SDSS DR7 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10456+6250 = Sti 714 additional meas Date: Sun, 13 Mar 2011 15:26:34 -0700 Several post-AC measurements for this one. The proper motion is near-zero, contrary to what's shown in the WDS, which looks like the B ---> A vector. theta rho epoch source WDS 10456+6250: 33.2 10.99 1984.170 GSC-ACT 33.9 11.55 1999.118 2MASS 34.1 11.56 2000.0 UCAC3 34.2 11.63 2000.261 SDSS DR7 --- V = 12.5 + 13.5 (TASS MkIV combined V, UCAC3 delta-mag); definitely not equal as shown in the WDS --- looks like a slow-creeping optical pair =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11243+5553 = Sti 2269 additional meas Date: Sun, 13 Mar 2011 15:58:46 -0700 This is clearly an optical pair. theta rho epoch source WDS 11243+5553: 90.6 6.95 2000.0 UCAC3 90.7 6.97 2000.238 2MASS 91.5 7.07 2001.888 SDSS DR7 --- V = 12.2 + 13.8 (TASS MkIV combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: Re: WDS 11244+0620 = hj 2569 additional meas Date: Sun, 13 Mar 2011 16:13:06 -0700 The 1830 measurement seems to be approximate but lets the pair be identified. theta rho epoch source WDS 11244+0620 144.1 8.54 2000. UCAC3 144.4 8.57 2000.181 2MASS 144.4 8.50 2000.249 CMC14 144.5 8.48 2002.175 SDSS DR7 --- UCAC3 epoch 2000.0 for primary, 2000.35 for comp --- 11.2 + 13.2 (ASAS-3 combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11246+5651 = Sti 2270 additional meas Date: Sun, 13 Mar 2011 17:58:22 -0700 Now clearly an optical pair. theta rho epoch source WDS 11246+5651: 201.9 11.60 1984.165 GSC-ACT 202.3 12.39 2000.238 2MASS 202.9 12.54 2003.188 SDSS DR7 --- V = 11.9 + 13.1 (TASS MkIV combined V, UCAC3 delta-mag, but UCAC3 very close to standard V here =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 12511+5838 = Sti 730 coords, additional meas Date: Sun, 13 Mar 2011 18:16:03 -0700 This pair seems to have acquired the coordinates for WDS 11319+6237 = Ptt 22, but is not near it on the sky. The Ptt 22 entry seems to be okay. WDS 12511+5838 = Sti 730: 12 51 08.35 +58 37 49.5 (J2000, 2MASS) theta rho epoch source 141.7 3.46 1999.216 2MASS 142.0 3.44 2001.287 SDSS DR7 --- V = 12.0 + 12.2 (TASS MkIV combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11360+5804 = Sti 2274 additional meas Date: Sun, 13 Mar 2011 18:26:50 -0700 Now clearly an optical pair. theta rho epoch source WDS 11360+5804: 26.5 7.35 1999.153 2MASS 26.8 7.37 2000.0 UCAC3 25.7 7.40 2003.188 SDSS DR7 --- V = 12.0 + 13.6 (TASS MkIV combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11367+1138 = J 2082 additional meas Date: Sun, 13 Mar 2011 18:36:45 -0700 Evidently optical? theta rho epoch source 184.0 7.61 1998.3 Bordeaux, mean epoch 183.8 7.56 2000.167 2MASS 183.3 7.61 2003.223 SDSS DR7 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11390+6037 = Mlb 463 SDSS meas Date: Sun, 13 Mar 2011 18:41:17 -0700 theta rho epoch source WDS 11390+6037: 340.3 2.95 2001.287 SDSS DR7 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11426+5857 = Sti 733 ID problem? Date: Sun, 13 Mar 2011 18:57:14 -0700 Stein 733 is certainly not the star at the position given in the WDS. Looking around for it, I notice this pair, not in the WDS, but which the Dommanget CCDM identifies as Stein 733. WDS 11426+5857 = Sti 733 ? 11 42 32.58 +58 57 05.9 (J2000, SDSS) theta rho epoch source 181.0 4.50 1913.359 AC2000 194.1 3.25 2001.287 SDSS DR7 --- except for the quadrant flip, this seems more-or-less like what's in the WDS at present for Sti 733 --- V = 12.8 + 13.5 (TASS MkIV combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11436+2442 = LDS 4138 recent meas Date: Sun, 13 Mar 2011 19:32:46 -0700 A good large-common-motion pair, but the pa clearly should be flipped 180 deg. theta rho epoch source WDS 11436+2442 232.5 3.78 1998.164 2MASS 232.5 3.78 2000.0 LSPM 213.7 3.76 2005.050 SDSS DR7 237.8 4.09 2005.050 SDSS DR7 --- the 2MASS and LSPM measures are of course not independent; the SDSS observations are problematic --- V = 12.4 + 15.2 (ASAS-3 combined V, SDSS delta-g, which looks about right) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11442+7311 = hj 2582 recent meas Date: Sun, 13 Mar 2011 19:40:52 -0700 It looks as though the northern star (now northwest) has significant motion while the other is nearly fixed. N.B. the dramatic shift in position-angle between POSS-I and POSS-II; alas, no measurements from those plates. theta rho epoch source WDS 11442+7311: 170.5 4.54 1999.263 2MASS =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11269+0344 meas Date: Sun, 13 Mar 2011 20:18:05 -0700 The closer pair in this group shares common motion (and AB surely = AC), but the other two nearby stars are optical. theta rho epoch source WDS 11269+0344 AB = AC: 70.3 8.38 2000.706 CMC14 70.2 8.44 2001.290 SDSS DR7 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 13261+2354 additional meas Date: Sun, 13 Mar 2011 21:10:50 -0700 Now clearly an optical pair. theta rho epoch source WDS 13261+2354: 212.2 8.75 1982.379 GSC-ACT 212.5 8.90 1992.399 GSC-2.3 212.0 9.17 1999.225 2MASS 212.3 9.18 2000.983 CMC14 211.7 9.29 2005.050 SDSS DR7 --- V = 13.5 + 13.7 (ASAS-3 combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 13261+2354 = Es 1549 recovered Date: Sun, 13 Mar 2011 21:32:16 -0700 This pair is assigned to the wrong star in the WDS. WDS 13340+4318 = Es 1549: 13 33 58.82 +43 15 52.0 (J2000, UCAC2) theta rho epoch source 303.1 6.24 1896.28 AC2000 (slightly different epochs) 300.4 6.87 1998.400 2MASS 299.9 6.90 2000.0 UCAC3 299.5 6.84 2002.361 CMC14 300.1 6.86 2003.232 SDSS DR7 --- V = 10.3 + 12.2 (Tycho-2 V for primary, adjusted UCAC3 for comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 13388+7017 = Kui 122 comment Date: Sun, 13 Mar 2011 21:35:59 -0700 The star at this position, which matches in proper motion, has no companion 15" SE. Probably a clerical error at some point. From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Re: WDS 13388+7017 = Kui 122 comment Date: Wed, 16 Mar 2011 15:54:45 -0700 On Wed, 2011-03-16 at 11:36 -0400, Brian D. Mason wrote: > Yup, and we made it. It is actually 15475-3755SEE 249AB. > Some additional measures for the southern pair via VizieR: theta rho epoch source WDS 15475-3755 AB 132.0 15.11 1975.88 Rousseau 127.5 14.53 1999.277 DENIS --- since the primary is so bright, neither of these measures may be reliable WDS 15475-3755 AC 80.8 25.37 1999.364 2MASS --- I thought there must be an error here per the start/end WDS measures, but the primary was slipping by the C component when the 1956 observation was made, and is now off to the east =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09005+0610 = hj 2480 recovered? Date: Mon, 14 Mar 2011 19:40:04 -0700 A search in the neighborhood suggests this might be it. The proper motions are in the directions that would take it back roughly to the 1830 specs. Alas, no AC2000 coords for either star, but the measures below should be sufficient. Clearly an optical pair. WDS 09005+0610: 9 00 53.31 +06 03 37.1 (J2000, UCAC2) 64.8 13.96 1955.224 USNO-A2.0 66.8 14.00 1982.878 GSC-ACT 65.6 14.21 2000.0 UCAC2 65.5 14.20 2000.227 CMC14 --- V = 13.2 + 14.5 (ASAS-3 combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09025+1627 = XMI 86 AB doesn't exist Date: Mon, 14 Mar 2011 19:49:03 -0700 Although the AC pair is present and correct in the WDS, the B component 18" NW is not present. Perhaps another pair? =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09043+6419 = Sti 687 meas Date: Mon, 14 Mar 2011 20:37:16 -0700 Surprised this one was not picked up in 2MASS in the auto-match process. theta rho epoch source WDS 09043+6419: 228.5 7.97 1999.194 2MASS 228.1 8.02 2000.0 UCAC3 228.3 8.06 2003.886 SDSS DR7 --- V = 11.0 + 13.1 (TASS MkIV combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 09212+4239 = LDS 3877 coords+meas Date: Mon, 14 Mar 2011 20:54:02 -0700 This one has only semi-accurate coords in the WDS. WDS 09212+4239 = LDS 3877: 9 21 07.82 +42 38 02.3 (J2000, UCAC3) theta rho epoch epoch 61.3 23.84 1953.285 USNO-A2.0 61.3 23.92 1983.023 GSC-ACT 61.3 23.80 1990.064 GSC-2.3 61.2 23.79 1998.329 2MASS 61.2 23.86 2002.024 SDSS DR7 61.3 23.87 2003.096 CMC14 --- V = 14.3 + 14.5 (UCAC3 taken as V, probably not too far off); CMC14 r' = 13.7 + 13.9 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10160+3034 = BEW 6 meas Date: Mon, 14 Mar 2011 21:29:54 -0700 Here's an interesting one, where the primary is the well-known carbon star RW LMi. A lot of the astrometric catalogues fail here since the carbon star is so bright toward the red, and overpowers the companion. WDS 10160+3034 = RW LMi = CGCS 3083 theta rho epoch source 19.9 10.68 1984.020 GSC-ACT 20.8 11.18 1990.001 GSC-2.3 20.9 10.98 2002.4 CMC14 (mean epoch) 22.5 11.79 2004.291 SDSS DR7 --- V = 13(var) + 14.8 --- spectral type C4,3e (1979MNRAS.186..837C, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10449+6151 = Sti 713 meas Date: Mon, 14 Mar 2011 21:46:55 -0700 The position-angle needs to be flipped from the second to the third quadrant...or at least the pair at the WDS position has this problem. theta rho epoch source WDS 10449+6151: 228.8 13.13 1953.209 USNO-A2.0 227.6 13.31 2000.027 2MASS 227.4 13.29 2000.258 SDSS DR7 --- V = 11.0 + 15.9 (TASS MkIV for primary, adjusted UCAC3 for comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 10474+2355 = Pou 3089 meas Date: Mon, 14 Mar 2011 22:06:56 -0700 Coordinates are a bit off, but otherwise okay. WDS 10474+2355 = Pou 3089: 10 47 20.85 +23 55 48.5 (J2000, UCAC2) theta rho epoch source 192.9 11.47 1955.227 USNO-A2.0 193.3 11.93 1983.034 GSC-ACT 193.7 12.01 1997.187 GSC-2.3 193.5 11.98 1998.077 2MASS 193.6 11.98 2001.854 CMC14 193.4 11.96 2005.096 SDSS DR7 --- V = 13.2 + 14.5 (ASAS-3 combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11399+2819 = Sle 611 meas Date: Mon, 14 Mar 2011 22:26:15 -0700 The wide pair here seems to have significantly different specs than what's advertised in the WDS. Note slightly coordinates shift for the A component below. WDS 11399+2819 = Sle 611: 11 39 55.78 +28 18 48.0 (J2000, UCAC2) theta rho epoch source 165.7 33.08 1955.276 USNO-A2.0 165.2 33.74 1984.100 GSC-ACT 165.1 33.65 1989.026 GSC-2.3 164.9 33.86 2000.0 UCAC2 165.0 33.99 2005.047 SDSS DR7 --- V = 12.6 + 14.1 (UCAC3 taken as V, confirmed via ASAS-3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: bdm@usno.navy.mil Subject: WDS 11503+2506 = Sle 888 meas Date: Mon, 14 Mar 2011 22:44:27 -0700 Again, a modest coordinates improvement and additional measures. WDS 11503+2506 = Sle 888: 11 50 18.28 +25 05 48.6 (J2000, UCAC2) theta rho epoch source 95.8 10.92 1983.034 GSC-ACT 96.1 11.29 1996.372 GSC-2.3 96.4 11.25 2000.0 UCAC3 96.6 11.22 2002.479 CMC14 96.7 11.27 2005.050 SDSS DR7 --- V = 12.2 + 13.9 (ASAS-3 combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00118+5822 = Sti 1295 coords/meas Date: Thu, 17 Mar 2011 00:20:50 -0700 The star at the WDS position is single, but a few arcminutes north is what seems to be the right pair, also identified as Sti 1295 in the CCDM. WDS 00118+5822 = Sti 1295: 0 11 45.86 +58 22 38.9 (J2000, UCAC3) theta rho epoch source 74.9 2.22 1911.8 AC2000, slightly different epochs 60.8 2.15 1992.2 GSC-2.3, uncer and slightly different epochs 58.3 2.73 2000.0 UCAC3, uncertain --- V = 12.6 + 13.2 (TASS MkIV combined V, UCAC3 delta mag; UCAC3 native magnitudes close to standard V) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00166+2414 = Pou 15 coords/meas Date: Thu, 17 Mar 2011 00:43:44 -0700 This one is misidentified in the WDS, and actually lies about 4' north. WDS 00166+2414 = Pou 15: 0 16 36.62 +24 16 00.3 (J2000, UCAC3) theta rho epoch source 25.1 2.83 2001.53 UCAC3 25.4 2.90 2004.713 SDSS DR7 --- V = 14.2 + 14.8 (SDSS DR7 g+r/2) 14.1 + 14.7 (ASAS-3 combined V, UCAC3 delta-mag) ...consistent within errors =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00197+4639 = Es 1196 coords/meas Date: Thu, 17 Mar 2011 00:58:54 -0700 Also misidentified, and lying 4'-5' north. Perhaps due to the usual BD name error by Espin. WDS 00197+4639 = Es 1196 = BD+45 61 = AG+46 38 (not BD+45 59) 0 19 50.44 +46 43 22.7 (J2000, UCAC2) --- theta = 189.5, rho = 4.57, epoch 1998.841, 2MASS --- spectral type G0 (Vyssotsky in AGK3) --- despite the seeming change in sep/pa since the early measure, there seems to no change in orientation between POSS-I and recent images, despite the significant proper motion, which is much larger for this star than BD+45 59 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00199+2633 = Che 4 coords/meas Date: Thu, 17 Mar 2011 10:58:39 -0700 A small shift in coordinates. There is no significant position-angle shift between POSS-I and 2MASS images, suggesting the Chevalier pa should be mirror-flipped around the N-S line to pa 205. This pair is not BD+25 38 as per the WDS. The BD star is located at: 0 21 10.6 +26 40 02 (J2000), and appears to be single. WDS 00199+2633 = Che 4: 0 19 56.81 +26 33 40.8 (J2000, 2MASS) theta rho epoch source 204.0 4.16 1998.019 2MASS 204.1 3.98 2001.8 CMC14, somewhat different epochs for the two --- V = 12.8 + 14.1 (ASAS-3 combined V, UCAC3 delta-mag; again UCAC3 very close to standard V) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00204+2617 = Che 6 coords/meas Date: Thu, 17 Mar 2011 11:21:35 -0700 A modest coordinates shift. The pair is clearly optical, with the companion showing noticeable motion. The 1989 measure in the WDS appears to be poor. WDS 00204+2617 = Che 6: 0 20 18.14 +26 16 43.3 (J2000, UCAC2) theta rho epoch source 195.1 11.40 1954.663 USNO-A2.0 188.6 11.70 1983.686 GSC-ACT 187.9 11.87 1989.891 GSC-2.3 186.5 11.93 1998.019 2MASS 185.7 11.98 2001.559 CMC14 --- V = 13.9 + 14.9 (UCAC3 taken as V; combined V = 13.5 in ASAS-3) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00236+2621 = Che 19 coords/meas Date: Thu, 17 Mar 2011 11:32:11 -0700 Another coordinates correction and additional observations. Again, the WDS 1989 measure is maybe not so great. WDS 00236+2621 = Che 19: 0 23 41.38 +26 20 56.7 (J2000, UCAC2) theta rho epoch source 354.0 7.10 1989.891 GSC-2.3 354.2 7.61 1997.794 2MASS 354.2 7.59 2001.898 CMC14 --- V = 12.4 + 15.1 (ASAS-3 combined V, UCAC3 delta-mag) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00237+2702 = Che 20 coords/meas Date: Thu, 17 Mar 2011 11:45:18 -0700 Modest coordinates correction and new measures. The intervening WDS 1989 measure doesn't look too far off this time. WDS 00237+2702 = Che 20: 0 23 51.98 +27 03 10.4 (J2000, UCAC2) theta rho epoch source 203.9 16.59 1954.663 USNO-A2.0 209.2 17.27 1997.794 2MASS 209.1 17.29 2001.633 CMC14 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00243+273 = Che 21 coords/meas Date: Thu, 17 Mar 2011 12:04:42 -0700 Another modest coordinates correction and new measures. Not much change, so possibly a physical pair. WDS 00243+2731 = Che 21: 0 24 20.01 +27 28 05.1 (J2000, UCAC2) theta rho epoch source 159.9 18.94 1954.663 USNO-A2.0 158.9 18.84 1984.646 GSC-ACT 158.8 18.81 1989.891 GSC-2.3 159.0 18.82 1997.794 2MASS 158.9 18.80 2000.0 UCAC2 158.9 18.81 2001.805 CMC14 --- V = 14.3 + 14.7 (UCAC3 taken as V, consistent with CMC14 Sloan r' = 13.9 + 14.4) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00245+4022 = Mlb 913 meas Date: Thu, 17 Mar 2011 12:20:52 -0700 Delta-magnitude is much larger than advertised. theta rho epoch source 84.2 7.16 2002.64 UCAC3 84.6 6.77 2002.783 CMC14, slightly different epochs --- UCAC3 gives an epoch observation for the secondary, shown above, but since the proper motion of the primary is slow, it shouldn't make significant difference in the relative astrometry --- for the companion n=2 from UCAC3 and n=1 from CMC14, so perhaps neither measure is especially accurate, particularly in view of the large delta-mag --- still better than _no_ observations --- V = 10.4 + 15.5 (Tycho-2 for primary, adjusted UCAC3 for comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00250+2653 = Che 25 coords/meas Date: Thu, 17 Mar 2011 12:40:41 -0700 These ones are kinda boring... WDS 00250+2653 = Che 25: 0 24 58.77 +26 54 11.5 (J2000, UCAC2) theta rho epoch source 80.5 22.74 1954.663 USNO.A2.0 80.7 23.77 2000.0 UCAC2 80.7 23.84 2001.627 CMC14 --- V = 13.1 + 14.2 (UCAC3 taken as V; CMC14 r' 12.8 + 13.7) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00344+5617 coords Date: Thu, 17 Mar 2011 12:46:41 -0700 Misidentified in the WDS, but readily found in the immediate field. WDS 00344+5617 = Sti 1382: 0 34 21.02 +56 17 09.3 (J2000, UCAC3) --- southern component is very much brighter toward the red, so the 2MASS position is for that star =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 01363+1026 = LDS 1109 2MASS meas Date: Thu, 17 Mar 2011 19:35:09 -0700 A nice one for 2MASS. theta rho epoch source WDS 01363+1026: 178.9 4.65 2000.731 2MASS =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: LHS 6046 is cpm pair Date: Thu, 17 Mar 2011 20:09:38 -0700 This object seems to be partly resolved on POSS-I, and the companion shows little change in relative position on recent images. It is fairly close, so only an estimate from the 2MASS images. LHS 6046 = G 4-8: 2 16 16.28 +10 13 11.4 (J20000, LSPM) --- separation 3".1 in pa 116, epoch 2000.739 (2MASS estimate) --- 14.2 + 17 ? (ASAS-3 V for primary, estimate for comp) --- spectral type M6:V (1984AJ.....89.1229R, primary only) --- V-K = 4.7, which suggests the type is about M3, not so late as Robertson has it; this puts the system out at about 35pc =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason , thenry@chara.gsu.edu Subject: G 79-25 is cpm pair Date: Thu, 17 Mar 2011 20:46:45 -0700 Though not in the WDS, this one seems to be present in various astrometric catalogues, including a double entry in LSPM. G 79-25: 3 18 38.60 +08 27 06.7 (J2000, LSPM) theta rho epoch source 355.7 5.75 1999.934 2MASS 355.9 5.45 2000.808 CMC14 --- V = 13.3 + 14.5 (published combined V, UCAC3 delta-mag) --- spectral type M3V (1984AJ.....89.1229R, primary only) --- type and colors agree on M3 dwarf, implying distance ~23pc =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 03478+0805 = LDS 3531 coords/meas Date: Thu, 17 Mar 2011 21:02:59 -0700 This is about 90" off in the WDS. WDS 03478+0805 = LDS 3531: 3 47 49.25 +08 04 09.5 (J2000, 2MASS) theta rho epoch source 51.6 18.25 1955.941 USNO-A2.0 52.2 18.27 1988.943 GSC-2.3 51.5 18.26 2000.898 2MASS 51.5 18.30 2001.474 CMC14 --- V = 12.7 + 15.7 (ASAS-3 V for primary, adjusted UCAC3 for comp) --- various determinations of the proper motions are somewhat garbled (i.e. not identical, as they must be) --- spectral type M2:V (1984AJ.....89.1229R, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: [R78b] 280 is cpm pair Date: Thu, 17 Mar 2011 21:17:25 -0700 The common motion is clear between POSS-I and recent images, but only the near-contemporaneous UCAC3 and 2MASS measures are available. [R78b] 280 = 3UC 187-014527 = 2MASS J04254514+0327489 4 25 45.15 +03 27 48.9 (J2000, UCAC3) theta rho epoch source 106.1 4.43 2000.068 2MASS 105.9 4.26 2000.4 UCAC3 mean epoch --- V = 13.4 + 14.8 (ASAS-3 combined V, UCAC3 delta-mag; again UCAC3 close to standard V in this region) --- spectral type M2:V (1984AJ.....89.1229R, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 22263+0301 = LDS 4967 meas Date: Thu, 17 Mar 2011 21:36:13 -0700 Some recent measures and improved photometry and spectral types. WDS 22263+0301 = LDS 4967 theta rho source source 200.2 11.34 1990.628 GSC-2.3 200.5 11.43 2000.539 2MASS 200.1 11.31 2002.728 CMC14 --- V = 13.7 + 15.7 (published V for primary, adjusted UCAC3 for comp) --- spectral types M3.5 + M5 (1995AJ....110.1838R) --- known pair close to the 25pc "nearby" radius =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: [R78b] 522 cpm companion Date: Thu, 17 Mar 2011 22:18:18 -0700 This looks like a good new one with modest common motion. [R78b] 522 = 3UC 191-272889 = 2MASS J21401545+0516258 21 40 15.46 +05 16 25.9 (J2000, UCAC3) theta rho epoch source 22.9 14.87 1953.781 USNO-A2.0 23.4 14.90 1995.568 GSC-2.3 22.8 14.88 2000.537 2MASS 23.2 14.94 2001.701 CMC14 22.9 14.97 2005.736 SDSS DR7 --- V = 13.7 + 17.1 (ASAS-3 V for primary, CMC14 delta-mag); Sloan r' 13.1 + 16.5 (CMC14, SDSS DR7) --- spectral type M4:V (1984AJ.....89.1229R, primary only) --- V-K color points to type M3, which puts it a bit outside 25pc radius =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J214237.27+002639.8 cpm pair Date: Thu, 17 Mar 2011 23:13:48 -0700 A random Sloan M dwarf. I guess this gets added to the 'WAA' acronym, since the star was in the Andrew West survey paper (2008AJ....135..785W). SDSS J214237.26+002639.7: 21 42 37.26 +00 26 39.8 (J2000, SDSS DR7) --- theta = 27.6, rho = 1.72, epoch 2001.7201, SDSS DR7 --- V = 17.7 + 18.0 (SDSS DR7 g+r/2) --- spectral type M3 (2008AJ....135..785W, primary only?) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J214241.81-003926.0 cpm pair Date: Thu, 17 Mar 2011 23:21:54 -0700 There's a lot of these.... SDSS J214241.81-003926.0: 21 42 41.82 -00 39 26.1 (J2000, SDSS DR7) --- theta = 78.4, rho = 1.27, epoch 2001.720, SDSS DR7 --- V = 19.0 + 19.1 (SDSS DR7 g+r/2) --- spectral type M0 (2008AJ....135..785W, combined type) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J214329.75+005225.3 cpm pair Date: Thu, 17 Mar 2011 23:36:38 -0700 This relatively bright one is separated by only ~2 of the SDSS pixels (0".4). Not resolved in the catalogue. SDSS J214329.75+005225.3: 21 43 29.75 +00 52 25.3 (J2000, SDSS DR7) --- coordinates are mid-point --- theta = 0, rho = 0.8, epoch 2001.720, SDSS DR7 estimates --- V = 18.7 + 18.7 (SDSS DR7 g+r/2 taken as combined light, delta-mag = 0 assumed) --- spectral type M3 (2008AJ....135..785W, combined type) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J214514.71+122111.5 cpm pair Date: Fri, 18 Mar 2011 00:11:50 -0700 A nice relatively bright one where the common motion is clear from comparing POSS-I with recent images. SDSS J214514.71+122111.5: 21 45 14.72 +12 21 11.6 (J2000, SDSS DR7) --- theta = 312.4, rho = 1.99, epoch 2001.714, SDSS DR7 --- V = 18.5 + 18.7 (SDSS DR7 g+r/2) --- spectral type M4e (2008AJ....135..785W, probably primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J214523.71+114911.7 cpm pair Date: Fri, 18 Mar 2011 00:24:23 -0700 This has two sets of measurements in the Sloan catalogue; pretty close, so somewhat uncertain measures. SDSS J214523.71+114911.7: 21 45 23.71 +11 49 11.8 (J2000, SDSS DR7) theta rho epoch source 177.1 1.17 2000.740 SDSS DR7 184.7 1.29 2001.714 SDSS DR7 --- images suggest mean values might be preferred --- V = 18.8 + 20.0 (SDSS DR7 g+r/2) --- spectral type M0 (2008AJ....135..785W, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Bahcall-Soneira NGP pair Date: Fri, 18 Mar 2011 21:23:40 -0700 Having a look at the wide pairs given by Bahcall & Soneira at the NGP in 1981ApJ...246..122B. Some of these are already shown in the WDS, and others are obviously optical per motions in the usual catalogues. Only one pair appears to be both new and have common motion, and indeed also matching radial velocities from related follow-up from the Dave Latham group. BD+28 2200 + AG+28 1309: 13 14 34.42 +27 58 46.3 (J2000, Tycho-2) --- this is pair 7 in Bahcall & Soneira Table 5; it is also Weistrop 43227 + 43228. as a side note, I have Donna Weistrop's finder charts from her thesis, which are like 4x blow-ups of the relevant POSS-I plate with several thousand stars labelled on them by hand in microscopic writing. theta rho epoch source 277.0 39.08 1898.781 AC2000 277.1 39.65 1955.287 USNO-A2.0 277.5 39.24 1982.384 GSC-ACT 277.4 39.06 1992.25 Tycho-2, at epoch 277.5 39.19 2000.274 2MASS 277.5 39.22 2001.203 CMC14 277.2 39.20 2005.050 SDSS DR7 --- UCAC3 shows the AGK2-Hamburg flag for both stars, so presumably one more reliable pre-POSS-I measure exists --- V = 10.8 + 11.4 (published V for primary, ASAS-3 for comp) --- spectral types G8VmF6 + G5V (1991AJ....101..625L) --- radial velocities -26.67 and -26.43 km/sec (2006PASP..118.1656S) ...which guarantees the physical link with the common motion =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J225313.65+010559.3 WD/MD cpm pair Date: Fri, 18 Mar 2011 23:15:32 -0700 Another random Sloan pair where West et al have given the spectral type. In this case, the companion is very blue, and must be a white dwarf, which I take as the primary. It is the brighter star in the Sloan g band, and only star present at u, but the situation reverses at z, where only the M dwarf is visible (the WD star is barely visible at i). SDSS J225313.65+010559.3: 22 53 13.66 +01 05 59.4 (J2000, SDSS DR7) --- coords for white-dwarf component --- theta = 215.1, rho = 1.57, epoch 2001.789, SDSS DR7 --- V = 20.2 + 20.0 (SDSS DR7 g+r/2) --- spectral type M4 (2008AJ....135..785W, secondary only) --- modest common motion clear from POSS-I and recent images =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J225253.61-002543.1 cpm pair Date: Fri, 18 Mar 2011 23:29:18 -0700 A relatively bright one as these things go. SDSS J225253.61-002543.1: 22 52 53.61 -00 25 43.2 (J2000, SDSS DR7) --- theta 153.6, rho = 1.77, epoch 2001.789, SDSS DR7 --- V = 18.4 + 18.9 (SDSS DR7 g+r/2) --- spectral type M2 (2008AJ....135..785W, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J225337.52+135032.3 cpm pair Date: Fri, 18 Mar 2011 23:45:27 -0700 This must be close to the limit of what is actually resolved in the catalogue (versus what's resolvable in the images); the differential astrometry and the photometry must also be correspondingly uncertain. SDSS J225337.52+135032.3: 22 53 37.53 +13 50 32.4 (J2000, SDSS DR7) --- theta = 268.1, rho = 0.92, epoch 2000.740, SDSS DR7 --- V = 18.6 + 19.2 (SDSS DR7 g+r/2) --- spectral type M0 (2008AJ....135..785W, prob combined type) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J225410.03-005745.5 cpm pair Date: Fri, 18 Mar 2011 23:57:49 -0700 Variously oval on the POSS-I/II images, but resolved nicely in SDSS. SDSS J225410.03-005745.5: 22 54 10.04 -00 57 45.6 (J2000, SDSS DR7) --- theta = 134.1, rho = 1.54, epoch 2001.789, SDSS DR7 --- V = 19.2 + 20.0 (SDSS DR7 g+r/2) --- spectral type M3 (2008AJ....135..785W, prob primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J225436.04+132354.0 cpm pair Date: Sat, 19 Mar 2011 00:21:52 -0700 In this case, the SDSS spectrum targeted the fainter component of an M-dwarf binary. But because of the delta-mag, I'm pretty sure the spectral type is instead for the primary. The spectrograph fibers were 3" diameter, so stuff under 1".5 separation will have some degree of blending/contamination (or maybe farther, depending on seeing). It's remarkable enough that they're resolved in the object catalogue. SDSS J225436.04+132354.0: 22 54 36.05 +13 23 54.0 (J2000, SDSS DR7) --- theta = 43.5, rho = 1.15, 2000.740, SDSS DR7 --- V = 19.1 = 20.1 (SDSS DR7 g+r/2) --- spectral type M3 (2008AJ....135..785W, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: SDSS J225551.08-080940.9 cpm pair Date: Sat, 19 Mar 2011 00:59:03 -0700 This one is too close for the catalogue, which may be because the images are just a little soft. SDSS J225551.08-080940.9: 22 55 51.08 -08 09 41.0 (J2000, SDSS DR7) --- theta = 350, rho = 0".9, epoch 2000.674, SDSS DR7 estimates --- V = 18.2 + 19.2 (SDSS DR7 g+r/2 combined mag, and estimated delta-m = 1.0) --- spectral type M0 (2008AJ....135..785W, prob primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Odenkirchen pairs additional meas Date: Sat, 19 Mar 2011 12:20:29 -0700 theta rho epoch source WDS 09578+6829 = Ode 3: 31.3 14.02 1953.179 USNO-A2.0 32.7 15.76 1984.099 GSC-ACT 33.9 15.77 1998.900 GSC-2.3 31.9 15.86 2003.914 SDSS DR7 --- optical pair WDS 09591+6847 = Ode 4: 0.6 18.19 1953.179 USNO-A2.0 0.3 18.89 1964.840 Pul-3 0.5 18.68 1984.099 GSC-ACT 1.3 18.53 2003.886 SDSS DR7 --- Pul-3 = 2004A&A...418..357K: "A catalogue of positions and proper motions of 58483 stars on the ICRS system at the Pulkovo plates with galaxies." VizieR item I/290. the ReadMe says the measurements are from plates with the Pulkova astrograph (33cm aperture, 3467mm focal length) reduced against Tycho-2. some checks on other pairs suggests accuracy is not high, but might be okay for wide pairs like this. WDS 10005+6943 = Ode 5: 260.6 17.29 1953.179 USNO-A2.0 260.5 16.99 1984.099 GSC-ACT 261.5 16.82 2003.914 SDSS DR7 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: CD-41 4442 cpm pair Date: Sat, 19 Mar 2011 14:11:51 -0700 Back among the 'Cape Faint' stars now. CD-41 4442 = CPD-41 2900 = TYC 7683-2103-1 8 44 29.20 -41 59 50.6 (J2000, UCAC2) theta rho epoch source 346.1 11.67 1900.499 AC2000 351.3 11.11 1976.15 Rousseau 348.1 11.04 1997.192 DENIS 348.3 11.08 2000.0 UCAC2 348.2 11.08 2001.088 2MASS --- V = 10.0 + 11.9 (Tycho-2 for primary, UCAC3 for secondary) --- spectral type B9 ('Cape Faint', primary only) A0: (1980A&AS...41..245G, primary only) --- 2MASS J-K for companion = 0.20, about right for delta-mag =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 08586+2711 = Zhn 4 SDSS meas Date: Sun, 20 Mar 2011 20:42:34 -0700 Some follow-up measures via SDSS DR7. theta rho epoch source 168.5 15.35 2004.130 SDSS DR7 168.5 15.35 2004.209 SDSS DR7 V = 16.6 + 23.0 (SDSS DR7 g+r/2) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: HD 77307 companions Date: Sun, 20 Mar 2011 21:23:31 -0700 This young star (strong lithium, x-ray source) has two reasonably close companions. Colors are reasonably consistent with the comps being physical, but proper motions are small, and there are no radial velocities. HD 77307: 8 58 48.59 -61 15 15.1 (J2000, UCAC2) theta rho epoch source AB: 257.6 4.48 1998.405 DENIS 257.4 4.81 2000.011 2MASS --- V = 9.6 + 12.6 (Tycho-2 for primary, adjusted UCAC3 for comp) --- spectral type G5/8III/IV (Houk) G8IV (2006A&A...460..695T) --- B comp has erroneous 'radial' proper motion in UCAC3 theta rho epoch source AC: 198.2 19.07 1974.15 Rousseau 195.8 18.78 1979.212 GSC-ACT 197.7 19.32 1998.405 DENIS 197.8 19.45 2000.0 UCAC2 197.8 19.38 2000.011 2MASS --- V = 9.6 + 13.1 (Tycho-2 for primary, adjusted UCAC3 for comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: [SR88] 17027 is double Date: Sun, 20 Mar 2011 23:56:45 -0700 I probably didn't send this one previously because there was no separate astrometry available. UCAC3 resolves them, and perhaps the data are as good as anything. [SR88] 17027 = 3UC 086-070554: 8 59 19.85 -47 29 36.9 (J2000, UCAC3) --- theta = 40.3, rho = 2.10, epoch 2000.0, UCAC3 proper motions may be problematic, so pa/sep may not be strictly correct but okay as a placeholder --- V = 13.4 + 14.3 (ASAS-3 combined V, UCAC3 delta-mag) --- spectral type G2III: (1988AJ.....96..988S, combined type?) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 09093+2930 = LDS 3857 additional meas Date: Tue, 22 Mar 2011 00:47:28 -0700 It might be worth noting that this is a WD/DM pair. theta rho epoch source 323.4 11.24 2001.17 UCAC3 mean epoch 323.5 11.26 2001.274 CMC14 323.5 11.16 2003.316 SDSS DR7 --- V = 15.8 + 15.7 (SDSS DR7 g+r/2) --- spectral types DA3 (1988ApJ...328..213W, primary) DA (1988ApJS...66..391O, primary) DA2 (2003AJ....126.1362B, primary) M1.5 (2005AJ....129.2428S, secondary) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: HK Cnc companions Date: Wed, 23 Mar 2011 15:02:02 -0700 This B subdwarf seems to have two red companions that are about as much fainter as you'd expect M dwarfs to be relative to the subdwarf. Folks have looked specifically for red companions to this star spectroscopically in far-red and photometrically in the near-IR. Calculations foro rho/theta done directly with the epoch data (twice). This was the case where the primary has SDSS motion but the companions do not, and gave the funny results in VizieR. The position angles in these instances shifted by 1-2 degrees from what I originally had. The offsets are similar to the r x d-theta sort of errors in this case, but minus the systematic error. There is a 2MASS observation of AC, but the observation of C has 'UBA' quality flags and has a different epoch three years different than for A. HK Cnc: 8 59 02.64 +11 56 27.8 (J2000, UCAC2) theta rho epoch source AB: 94.0 2.65 1994.173 SDSS DR7 91.7 2.73 1994.257 SDSS DR7 --- V = 13.5 + 19.6 (SDSS DR7 g+r/2) AC: 296.0 3.61 1994.173 SDSS DR7 297.0 3.64 1994.257 SDSS DR7 --- V = 13.5 + 19.5 (SDSS DR7 g+r/2) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Bright star companions Date: Wed, 23 Mar 2011 23:33:22 -0700 The top item on astro-ph Wednesday evening was: http://arxiv.org/abs/1103.4363 The VAST Survey - I. Companions and the unexpected X-ray detection of B6-A7 stars De Rosa et al accepted for MNRAS They report a bunch of new companions to naked-eye A-type stars. I had a look at most of them, particularly those where the companions were wide enough to expect to see them on the usual DSS/2MASS/Sloan images. Some were there, some not; others were there but apparently at a different position angle than indicated. It was an interesting exercise in looking for very large delta-m companions around such grossly overexposed stars. I seem to have found three "likely" or certain new companions, the latter case being a new companion to a bona-fide Pleiad that doesn't seem to be in the catalogues for faint Pleiades. The others are faint very red stars that come up on SDSS i,z and 2MASS images, with delta-magnitudes around 10 in each instance. The two systems found by De Rosa et al are noted; I'm just giving additional observations for those. \Brian WDS 03458+2309 = STF 444 theta rho epoch source AC: 152.9 16.51 1998.857 2MASS --- V = 6.85 + 16.5 (published V for primary, estimate for comp via GSC-2.3 detection on the POSS-II far-red plate) --- new Pleiad, matching proper motion is clear WDS 14016+0133 = tau Vir theta rho epoch source AE: 174.1 14.60 1999.509 DENIS, mean of two _very_ discordant obs for the primary 174.8 14.93 2000.3 2MASS minus SDSS DR7 --- the 2MASS and SDSS observations were taken within a month of each other, and since the primary is no good in SDSS, I used the 2MASS position for it to reckon the position of the companion --- V = 4.25 + 15.4 (published V for primary, SDSS DR7 g+r/2 for comp) --- comp Aa 14" NE reported by De Rosa et al not visible HD 124713: 14 14 40.96 +21 52 24.2 (J2000, Tycho-2) theta rho epoch source AB: 178.1 4.21 2005.252 SDSS DR7 174.5 4.05 2008.526 De Rosa et al --- V = 6.39 + 17 ? (published V for primary, estimate for comp) HD 17138 = RZ Cas: 2 48 55.51 +69 38 03.4 (J2000, Tycho-2) theta rho epoch source AC: 73.2 7.22 1999.802 2MASS 70.5: 6.6: 2008.868 De Rosa et al --- primary V = 6.2 at max, comp V perhaps 14 ? (wild guess) --- reported with approx offsets by De Rosa et al HD 26764: 4 16 43.09 +53 36 42.5 (J2000, Tycho-2) theta rho epoch source AB: 115.9 13.71 1999.140 2MASS 116.1 13.72 2004.948 2MASS minus SDSS DR7 --- V = 5.19 + 15.5 (published V for primary, SDSS DR7 g+r/2 for comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: CHSS doubles Date: Thu, 24 Mar 2011 16:26:57 -0700 Here is a handful of doubles I noticed when going over the list of spectral types by Brown et al (2003AJ....126.1362B) in 2003. I just now reviewed the SDSS position-angles. The 'CHSS' acronym is the SIMBAD-approved one for this catalogue. The file I prepared is at: ftp://ftp.lowell.edu/pub/bas/starcats/brown.halo ...where among other things I mention UCAC2 in future tense. \Brian CHSS 238: 12 27 56.09 +29 31 13.1 (J2000, 2MASS) theta rho epoch source 47.8 4.23 2000.296 2MASS 48.2 3.84 2001.219 CMC14 47.2 4.15 2001.39 UCAC3 48.0 4.27 2004.957 SDSS DR7 --- the CMC14 measure is poor probably since n=1 --- V = 15.4 + 15.9 (SDSS DR7 g+r/2) --- spec type K3 (2003AJ....126.1362B, primary only) CHSS 286: 12 55 34.36 +29 32 32.7 (J2000, 2MASS) theta rho epoch source 179.4 4.60 2000.260 2MASS 180.2 4.67 2001.41 UCAC3, mean epoch 179.9 4.64 2004.390 SDSS DR7 --- V = 14.7 + 15.0 (SDSS DR7 g+r/2) --- spec type G3 (2003AJ....126.1362B, primary only) CHSS 298: 13 01 34.41 +29 23 48.3 (J2000, 2MASS) theta rho epoch source 143.9 8.80 2000.074 2MASS 143.8 8.76 2001.219 CMC14 143.5 8.87 2001.1 UCAC3, mean epoch 143.5 8.90 2004.390 SDSS DR7 --- V = 13.4 + 14.3 (TASS MkIV combined V, UCAC3 delta-mag) --- spec type F7 (2003AJ....126.1362B, primary only) CHSS 504: 8 36 40.06 +29 45 40.3 (J2000, UCAC2) theta rho epoch source 269.6 14.32 1953.940 USNO-A2.0 269.6 14.36 1983.037 GSC-ACT, n=2 269.4 14.41 1998.090 2MASS 269.5 14.40 2000.0 UCAC2 269.6 14.39 2001.255 CMC14 269.6 14.39 2003.067 SDSS DR7 --- V = 13.7 + 13.8 (TASS MkIV combined V, UCAC3 delta-mag) --- spec type F4 (2003AJ....126.1362B, primary only) CHSS 557: 9 00 00.60 +29 38 02.7 (J2000, 2MASS) theta rho epoch source 61.5 5.06 1998.887 2MASS 62.4 4.95 2001.16 UCAC3 62.6 4.94 2001.266 CMC14 62.1 5.02 2003.078 SDSS DR7 62.1 5.02 2004.130 SDSS DR7 --- V = 15.1 + 15.4 (SDSS DR7 g+r/2) --- spec type G7 (2003AJ....126.1362B, primary only) CHSS 853: 12 20 48.41 +29 06 04.9 (J2000, 2MASS) theta rho epoch source 50.3 4.60 2000.003 2MASS 48.1 4.56 2001.214 CMC14 50.3 4.63 2004.957 SDSS DR7 --- CMC14 n=1 and rather faint for the telescope --- V = 16.5 + 17.0 (SDSS DR7 g+r/2) --- spec type G3 (2003AJ....126.1362B, primary only) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00014+2719 = LDS 5156 additional meas Date: Thu, 24 Mar 2011 22:26:17 -0700 I would flip the pa to make the white dwarf the primary, but show this value as in the WDS at present. WDS 00014+2719 = LDS 5156 theta rho epoch source 301.0 10.15 1950.611 USNO-A2.0 301.3 10.06 2001.542 CMC14 301.0 10.20 2003.738 SDSS DR7 301.1 10.19 2003.738 SDSS DR7 --- V = 16.8 + 17.3 (M dwarf shown first) --- spectral types M5 + DA (2001AJ....121..503S) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00046-4044 = ERO 1 additional meas Date: Fri, 25 Mar 2011 00:10:40 -0700 These all antedate the measures in the WDS. The GSC-2.3 observation may be a little off because the companion is near the diffraction spike on the plate. The present 1999 WDS datum must be an estimate or something since the observations below show no change since 1982. WDS 00046-4044 = ERO 1 theta rho epoch source 258.1 17.90 1982.888 SuperCOSMOS, IV-N plate 258.3 18.06 1985.773 SuperCOSMOS, ESO red 258.5 18.11 1988.853 SuperCOSMOS, ESO red 258.3 18.13 1996.633 DENIS 261.1 18.43 1996.863 GSC-2.3 =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: WDS 00101+3825 D additional comp Date: Fri, 25 Mar 2011 00:32:53 -0700 I happened to notice that this very close pair has another companion that comes up on the POSS-II far-red and 2MASS images. WDS 00101+3825 Dab: 0 10 05.25 +38 24 53.8 (J2000, UCAC2) theta rho epoch source 295.3 4.14 1998.932 2MASS --- V = 10.7 + 16 ? (published V for primary, estimate for comp) =============================================================================== From: Brian Skiff Reply-To: bas@lowell.edu To: Brian D. Mason Subject: Faint SDSS doubles Date: Fri, 25 Mar 2011 11:25:41 -0700 Here are another 20 or so of these. \Brian SDSS J000022.53-105142.1: 0 00 22.54 -10 51 42.2 (J2000, SDSS DR7) theta rho epoch source 16.0 16.01 1954.671 USNO-A2.0 15.3 16.04 1994.663 GSC-2.3 15.8 16.08 2000.740 SDSS DR7 --- V = 18.9 + 20.1 (SDSS DR7 g+r/2) --- spectral type DA5 (2004ApJ...607..426K, primary only) --- companion also degenerate (g-r = 0.19) SDSS J000106.41+150516.6: 0 01 06.41 +15 05 16.7 (J2000, SDSS DR7) theta rho epoch source 236.2 1.42 2001.715 SDSS DR7 --- V = 17.7 + 18.7 (SDSS DR7 g+r/2) --- spectral type M3 (2008AJ....135..785W, primary only) SDSS J084358.89+091714.6: 8 43 58.89 +09 17 14.6 (J2000, SDSS DR7) theta rho epoch source 112 0.8 2004.075 SDSS DR7 estimates --- V = 18.3 + 18.3 (SDSS DR7 g+r/2 taken as combined light, with delta-mag = 0 assumed) --- spectral type M2 (2008AJ....135..785W, combined type) SDSS J084407.10+081514.9: 8 44 07.10 +08 15 15.0 (J2000, SDSS DR7) theta rho epoch source 196.7 1.67 2003.075 SDSS DR7 196.3 1.46 2003.076 SDSS DR7 --- V = 19.9 + 20.0 (SDSS DR7 g+r/2) --- spectral type M2 (2008AJ....135..785W, combined type) SDSS J084419.82+043053.6: 8 44 19.83 +04 30 53.6 (J2000, SDSS DR7) theta rho epoch source 227.5 1.92 2002.120 SDSS DR7 --- primary taken as WD star --- V = 17.5 + 17.4 (SDSS DR7 g+r/2) --- spectral types (WD) + M0 (primary very blue, companion type from 2008AJ....135..785W) SDSS J084433.41+390945.7: 8 44 33.41 +39 09 45.7 (J2000, SDSS DR7) theta rho epoch source 90 0.7 2002.0 SDSS estimates, two dates --- V = 18.5 + 18.5 (SDSS DR7 g+r/2 taken as combined light, with delta-mag = 0 assumed --- spectral type M2 (2008AJ....135..785W, combined type) SDSS J084454.27+561229.6: 8 44 54.27 +56 12 29.6 (J2000, SDSS DR7) theta rho epoch source 2.2 2.05 2000.337 SDSS DR7 --- V = 19.0 + 20.2 (SDSS DR7 g+r/2) --- spectral type M0 (2008AJ....135..785W, primary only) SDSS J084454.48+394416.2: 8 44 54.49 +39 44 16.3 (J2000, SDSS DR7) theta rho epoch source 51.8 1.31 2001.890 SDSS DR7 --- V = 19.0 + 19.3 (SDSS DR7 g+r/2 for primary, but estimate for comp since catalogue delta-mag too large) --- spectral type M3 (2008AJ....135..785W, combined type) SDSS J084502.20+362908.8: 8 45 02.21 +36 29 09.0 (J2000, SDSS DR7) theta rho epoch source 276.1 1.60 2002.024 SDSS DR7 279.3 1.67 2002.106 SDSS DR7 --- V = 18.0 + 18.9 (SDSS DR7 g+r/2) --- spectral type M0 (2008AJ....135..785W, combined type) SDSS J084520.61+241241.6: 8 45 20.61 +24 12 41.6 (J2000, SDSS DR7) theta rho epoch source 227.0 1.59 2004.209 SDSS DR7 230.2 1.56 2004.212 SDSS DR7 --- V = 19.9 + 20.1 (estimate for primary, SDSS DR7 g+r/2 for comp, SDSS photometry discordant) --- spectral type M2 (2008AJ....135..785W, combined type) SDSS J084534.56+392519.7: 8 45 34.56 +39 25 19.7 (J2000, SDSS DR7) theta rho epoch source 180 0.9 2001.890 SDSS DR7 estimates --- V = 18.7 + 19.2 (SDSS DR7 g+r/2 taken as combined light, with delta-mag = 0.5 assumed) --- spectral type M0 (2008AJ....135..785W, combined type) SDSS J084556.14+065431.0: 8 45 56.15 +06 54 31.1 (J2000, SDSS DR7) theta rho epoch source 298 0.8 2003.075 SDSS DR7 estimates --- V = 18.5 + 18.8 (SDSS DR7 g+r/2 taken as combined light, with delta-mag = 0.3 assumed) --- spectral type M0 (2008AJ....135..785W, combined type) SDSS J084557.41+222431.3: 8 45 57.42 +22 24 31.4 (J2000, SDSS DR7) theta rho epoch source 167 0.6 2004.288 SDSS DR7 estimates --- V = 18.7 + 19.7 (SDSS DR7 g+r/2 taken as combined light, with delta-mag = 1.0 assumed) --- spectral type M1 (2008AJ....135..785W, primary only) SDSS J084602.31+512208.1: 8 46 02.32 +51 22 08.2 (J2000, SDSS DR7) theta rho epoch source 291.0 2.52 2000.258 SDSS DR7 --- V = 15.1 + 17.8 (SDSS DR7 g+r/2) --- spectral type (K) + M0 (estimate for primary, secondary from 2008AJ....135..785W) SDSS J084605.43+440630.5: 8 46 05.43 +44 06 30.5 (J2000, SDSS DR7) theta rho epoch source 357.4 2.02 2002.024 SDSS DR7 --- V = 19.4 + 19.8 (SDSS DR7 g+r/2) --- spectral type (M) + M2 (estimate for primary, secondary from 2008AJ....135..785W) SDSS J084616.66+340551.5: 8 46 16.68 +34 05 51.5 (J2000, SDSS DR7) theta rho epoch source 137.5 1.15 2002.106 SDSS DR7 --- V = 16.8 + 17.5 (SDSS DR7 g+r/2) --- spectral type M3 (2008AJ....135..785W, combined type) SDSS J084632.69+533118.7: 8 46 32.69 +53 31 18.8 (J2000, SDSS DR7) theta rho epoch source 174 0.8 2000.263 SDSS DR7 estimates --- V = 18.4 + 18.4 (SDSS DR7 g+r/2 taken as combined light, with delta-mag = 0 assumed) --- spectral type M3 (2008AJ....135..785W, combined type) SDSS J084646.41+464132.9: 8 46 46.42 +46 41 33.0 (J2000, SDSS DR7) theta rho epoch source 270 1.1 2001.287 SDSS DR7 estimates --- V = 19.1 + 19.1 (SDSS DR7 g+r/2 taken as combined light, with delta-mag = 0 assumed) --- spectral type M3 (2008AJ....135..785W, combined type) SDSS J085823.64+323400.7: 8 58 23.65 +32 34 00.7 (J2000, SDSS DR7) theta rho epoch source 145.0 1.74 2002.999 SDSS DR7 --- V = 18.2 + 18.9 (SDSS DR7 g+r/2) --- spectral type (WD?) + M0 (uncertain estimate for primary [it is not red], secondary from 2008AJ....135..785W) SDSS J085846.73+044851.4: 8 58 46.73 +04 48 51.5 (J2000, SDSS DR7) theta rho epoch source 168.1 1.61 2002.120 SDSS DR7 --- V = 17.3 + 18.1 (SDSS DR7 g+r/2) --- spectral type M2 (2008AJ....135..785W, primary only) SDSS J085907.10+473620.4: 8 59 07.11 +47 36 20.5 (J2000, SDSS DR7) theta rho epoch source 29.0 1.61 2001.287 SDSS DR7 --- V = 19.0 + 19.0 (SDSS DR7 g+r/2) --- spectral type (WD) + M0 (estimate for primary, secondary from 2008AJ....135..785W) =============================================================================== =============================================================================== =============================================================================== =============================================================================== =============================================================================== 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