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Table 1

Parameters of the HST DA standard stars (Gianninas et al. 2011).

Name WD no.a T eff log g
[K] [cm/s2]

G191−B2B 0501 + 527 60 920 ± 993 7.55 ± 0.05
GD 71 0549 + 158 33 590 ± 483 7.93 ± 0.05
GD 153 1254 + 223 40 320 ± 626 7.93 ± 0.05
HZ 43A b 1314 + 293 56 800 ± 1249c 7.89 ± 0.07

Notes.

(a)

WD numbers are from McCook & Sion (1999).

(b)

HZ 43A is only used in the UV because of contamination at longer wavelengths from its M-dwarf companion.

(c)

Beuermann et al. (2006, 2008) determined and log g = 7.90 ± 0.080.

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