GD 31

All names: WD0231-054, SDSS J023407.87-051138.4, CNS5 651, GALEX J023407.8-051137, SDSS J023407.87-051138.5, EGGR 207, WD 0231-05, GJ 2027, GEN# +6.10060031, PHL 1358, Gaia DR2 2488960249844340352, BPS CS 22954-0002, LP 650-250, GD 31, Gaia DR3 2488960249844340352, USNO-B1.0 0848-00024470, NLTT 8353, GCRV 21686, WD 0231-054, 2MASS J02340770-0511394, WDJ023407.73-051139.33, J0234-0511, Gaia EDR3 2488960249844340352, TIC 251106994

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 Jewett et al. 2024 O'Brien et al. 2024 Kilic et al. 2020 MWDD H Gaia DR2 Stilism Sion et al. 2014 Gianninas et al. 2011 Koester et al. 2009 Zuckerman et al. 2003 Koester et al. 2001 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 02 34 07.99 (0.02) 02 34 07.98 (0.05) 02 34 07.68 02 34 07.60 02 34 07.99 02 34 07.73 (0.02) 02 34 07.98 02 34 06.91
Declination -05 11 37.86 (0.02) -05 11 37.90 (0.04) -05 11 38.40 -05 11 41.00 -05 11 37.86 -05 11 39.33 (0.02) -05 11 37.90 -05 11 46.32
Spectral type DA DA DA DA DA3.7 DA3.7 DA DA DA DA2.9 DA4
Effective temperature [K] 12634.0 (77) 12634.0 (77) 13146.0 (203) 12635.0 (77) 12885.0 13550.0 17470.0 (274) 17306.0 (11) 9439.0 16579.0 (48) 13649.0 (141)
log(g) [cgs] 8.55 (0.004) 8.55 8.58 (0.01) 8.55 (0.005) 8.57 8.58 (0.05) 8.45 (0.003) 8.00 8.54 (0.01) 8.61 (0.006)
Mass [M] 0.958 (0.004) 0.958 (0.004) 0.976 (0.008) 0.957 (0.004) 0.967 0.98 (0.03) 0.96 0.992 (0.005)
log(Luminosity) [L]
Cooling age [Gyr] 0.8100 (0.01) 0.7506
log(H/He)
log(C/He)
log(Ca/He)
log(Ca/H) <-10.542
log(C/H)
log(N/H)
log(O/H)
log(Na/H)
log(Mg/H)
log(Al/H)
log(Si/H)
log(P/H)
log(S/H)
log(Sc/H)
log(Ti/H)
log(Cr/H)
log(Mn/H)
log(Fe/H)
log(Ni/H)
Parallax [mas] 41.65 (0.02) 41.65 (0.02) 41.63 (0.06) 41.65 41.65 (0.02) 41.63 (0.06)
Distance [pc] 24.01 (0.01) 24.01 (0.01) 24.02 (0.03) 22.70 29.00 24.01 24.01 (0.01) 24.02 (0.03)
Composition H H H H
Proper motion (right ascension) [mas/yr] 244.1112301 (0.02) 243.9042046 (0.09) 244.111 (0.02) 243.9042046
Proper motion (declination) [mas/yr] 92.07369293 (0.02) 91.98964289 (0.08) 92.074 (0.02) 91.98964289
Variability NOV
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 14.45
V magnitude 14.24 14.24 14.24
R magnitude 14.30
I magnitude
J magnitude 14.54 (0.03)
H magnitude 14.56 (0.05)
K magnitude 14.66 (0.1)
u magnitude 14.57 (0.004) 14.57 (0.004)
g magnitude 14.26 (0.003) 14.26 (0.003)
r magnitude 14.48 (0.004) 14.48 (0.004)
i magnitude 14.67 (0.004) 14.67 (0.004)
z magnitude 14.91 (0.004) 14.91 (0.004)
G magnitude 14.35 (0.001) 14.36 14.35 14.35 (0.003) 14.36
BP magnitude 14.34 (0.001) 14.33 14.33
RP magnitude 14.39 (0.001) 14.40 14.40
Pan g magnitude 14.27 (0.003)
Pan r magnitude 14.47 (0.003)
Pan i magnitude 14.72 (0.003)
Pan z magnitude 14.92 (0.003)
Pan y magnitude 15.06 (0.007)
E(B-V) 0.000

* Constant surface field

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The Montreal White Dwarf Database is produced and maintained by Prof. Patrick Dufour (Université de Montréal) and Dr. Simon Blouin (University of Victoria). Please send database updates, corrections, suggestions or bug reports to patrick.dufour@umontreal.ca.