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Table 1

Astrometry and photometry of known and candidate (1–3) WD companions and their primaries in nearby TGAS/UCAC5 CPM pairs and of additional known WDs with no previous trigonometric parallaxes (in SIMBAD) and one WD candidate (4) found in the UPC.

Name RAa Deca plxTGAS plxUPC pmRA pmDec pmo Ga Jb SpT Ref
(WD name/cand) (Sep, PA)a (|dpm|)f
[deg] [deg] [mas] [mas] [mas yr−1] [mas yr−1] [mas yr−1] [mag] [mag] [mag]
([arcsec,°]) ([mas yr−1])
GJ 171.2 A 069.202096 +27.131577 57.2 ± 0.3 65.1 ± 9.0 +232.1 ± 0.1c −147.7 ± 0.1c 9 7.64 5.95 +0.71 K3IVke 3
GJ 171.2 B 069.188131 +27.163694 (124.0, 339) 80.1 ± 11.0 +230.8 ± 3.0d −146.6 ± 2.9d (1, 1) 15.53 14.60 +0.46 DA9.0 1
(=WD 0433 + 270) +229.7 ± 6.1e −142.9 ± 6.0e
Ross 429 118.543958 −25.302335 56.2 ± 0.3 - −300.8 ± 0.1c +201.0 ± 0.1c 5 8.97 7.02 +0.85 M0 4
SCR J0753-2524i 118.484536 −25.399551 (399.8, 209) - −286.4±5.2d +205.5 ± 5.3d (14, 4) 15.93 14.75 +0.44 DA9.8 1
(=WD 0751−252)
GJ 841 A 329.421448 −51.007760 66.1 ± 0.5 - −35.3 ± 0.2c −379.8 ± 0.2c 25 9.24 6.75 +0.87 M2Ve 5
GJ 841 B 329.409514 −51.010412 (28.7, 251) - −46.5 ± 1.2d −395.5 ± 1.1d (11, 16) 14.48 14.01 +0.20 DQ8.3 1
(=WD 2154−512)
HD 166435 272.339436 +29.951968 40.7 ± 0.2 46.1 ± 8.8 +71.9 ± 0.1c +61.1 ± 0.1c 12 6.62 5.69 +0.37 G1IV 3
HD 166435 B 272.331393 +29.956100 (29.2, 301) 50.4 ± 3.3 +64.8 ± 1.2d +72.4±1.2d (7, 11) 13.16 13.70 −0.16 DA2.2 ± 0.2 2
(=‘1’) +67.4 ± 2.4e +71.5 ± 2.4e
TYC 3980-1081-1 327.909017 +59.294450 120.6 ± 1.0 154.7 ± 12.1 −70.8 ± 2.5c +76.1 ± 2.4c 84 9.20 6.53 +0.88 ≈M2 2
TYC 3980-1081-1 B 327.916408 +59.292935 (14.6, 112) 131.0 ± 4.4 −87.2 ± 2.2d −31.2 ± 2.0d (16, 107) 14.28 12.97g +0.32g ≈DA10? 2
(=‘2’) −79.5 ± 3.3e −17.3 ± 3.2e
HD 35650 081.125938 −38.969890 57.4 ± 0.3 - +43.1 ± 0.1c −57.3 ± 0.1c 5 8.43 6.70 +0.78 K6Vke 6
HD 35650 B 081.252385 −39.053688 (464.9, 131) - +46.3 ± 1.9d −48.8 ± 2.0d (3, 9) 14.99 13.87 +0.53 ≈DA9? 2
(=‘3’)

GJ 3285 066.473476 +12.195784 - 58.0 ± 8.0 −94.6 ± 6.4e −227.9 ± 6.4e - 15.21 14.49 +0.24 DC8.2 1
(=WD 0423 + 120
GJ 275.2 Bh 112.695736 +48.168756 - 89.6 ± 4.2 −216.6 ± 4.0e −1274.9 ± 3.8e - 14.84 13.08 +0.33 DA10.0+DA10.1 1
(=WD 0727 + 482
GJ 1098 113.379072 +64.156548 - 54.3 ± 8.2 +50.9 ± 6.8e −260.5 ± 5.9e - 15.91 14.81 +0.43 DA11.1 1
(=WD 0728 + 642
GJ 4165j 312.278706e +37.471154e - 63.1 ± 2.9 +167.1 ± 2.9e +154.3 ± 2.9e - - 13.30 −0.13 DA3.6 1
(=WD 2047 + 372
UPC 72924 277.995093 +46.974870 - 40.2 ± 6.6 +61.5 ± 4.6e +38.4 ± 4.4e - 15.05 14.52 +0.14 ≈DA7? 2
(=‘4’)

Notes. Gaia coordinates are for (J2000, epoch 2015.0) and were rounded to 0.000001 degrees. Although the TGAS data may be more accurate, all parallaxes and their errors were rounded to 0.1 mas, proper motions and their errors to 0.1 mas yr−1. The absolute values of measured proper motion differences dpm and the estimated effect because of orbital motion pmo were rounded to 1 mas yr−1. Magnitudes and colours were rounded to 0.01 mag. Spectral types with question marks are only guesses based on GJ and MG (Figs. 3 and 5). Further notes on the data: (a) Gaia DR1, (b) 2MASS, (c) TGAS, (d) UCAC5, (e) UPC, (f) two values are given for RA and Dec, respectively, (g) J magnitude with very poor goodness-of-fit quality of the profile-fit photometry, (h) An accurate parallax of 87.4 ± 0.5 mas measured for this close binary by Nelan et al. (2015), (i)Subasavage et al. (2009) measured a parallax of 56.54 ± 0.95 mas, (j) this object is not plotted in Figs. 4 and 5, since it was not identified in Gaia DR1.

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