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Table 1.

Programme stars and their main physical features.

Star G d Teff log g M Age Previous observations
(pc) (K) c.g.s. (M) (Gyr)
WD 1309+853 G 256–7 15.8 16.5 5300 8.12 0.66 5.46 DA MWD with ⟨|B|⟩ ≃ 5.4 MG (7)
WD 1350−090 GJ 3814 14.6 19.7 9580 8.13 0.68 0.81 DA MWD with ⟨|B|⟩ ≃ 0.45 MG (5,15)
WD 1503−070 GD 175 15.8 20.3 6640 8.00 0.59 1.80 DA MWD with ⟨Bz⟩∼2 MG (12)
WD 1556+044 PM J15589+0417 16.0 22.5 6685 8.43 0.85 3.65 DC (He) never observed
WD 1647+591 DN Dra 12.3 10.9 12 738 8.24 0.76 0.45 Non magnetic DA WD (13)
WD 1748+708 G 240–72 13.8 6.2 5570 8.34 0.79 5.86 Known strongly polarised DQ WD (2,4,9)
WD 1831+197 G 184–12 16.3 39.3 7305 8.04 0.60 1.57 DQ (He) no polarisation detected (8)
WD 1856+534 LP 141–14 17.0 24.8 4430 7.69 0.40 4.34 DC (He) never observed
WD 1900+705 Grw +70° 8247 13.3 12.9 11 880 8.54 0.93 0.92 Known strongly polarised DA WD (1)
WD 1953−011 LAWD 79 13.6 11.6 7868 8.23 0.73 1.63 DA6 MWD (⟨Bz⟩∼0.1 MG with spot) (6,10)
WD 2011+063 G 24–9 15.7 22.9 6455 8.10 0.63 2.34 DC (He) no polarisation detected (3,8)
WD 2032+248 HD 340611 11.6 14.8 20 704 8.03 0.64 0.06 Non magnetic DA WD (13)
WD 2049−253 UCAC4 325–215293 16.0 18.0 4895 7.84 0.48 4.4 DC MWD (14)
WD 2049−222 LP 872–48 15.0 20.3 8164 8.33 0.79 1.97 DC (He) never observed
WD 2117+539 EGGR 378 12.4 17.3 15 250 7.94 0.58 0.17 Non magnetic DA WD (13)
WD 2254+076 G 28–27 17.1 45.5 12 847 9.26 1.29 ∼1.8 DA MWD with ⟨|B|⟩ ≃ 16 MG (11)

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