WD 0031-186

All names: GALEX J003340.8-182032, 2MASS J00334092-1820323, SDSS J003340.91-182032.30, Gaia DR3 2363965672055370112, KUV 00312-1837, SDSS J003340.91-182032.3, MCT 0031-1837, WD 0031-186, SDSS J003340.90-182032.3, Gaia EDR3 2363965672055370112, Gaia DR2 2363965672055370112

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Bergeron et al. 2021 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Bergeron et al. 2011 Vincent et al. 2024 Simbad White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 00 33 40.89 (0.06) 00 33 40.91 00 33 40.89 (0.08) 00 33 40.89 00 33 40.92 (0.06) 00 33 40.61 00 33 40.91
Declination -18 20 32.52 (0.07) -18 20 32.37 -18 20 32.52 (0.06) -18 20 32.52 -18 20 32.36 (0.07) -18 20 27.60 -18 20 32.34
Spectral type DB DBA DBA DB DB DB DBA DB
Effective temperature [K] 13883.0 (716) 14159.0 14276.0 13733.0 14685.0 (26) 15020.0 (397) 14624.0 (299) 15162.0 (46)
log(g) [cgs] 7.67 (0.4) 7.80 7.96 7.92 8.00 (0) 8.43 (0.1) 7.99 (0.03) 8.47 (0.03)
Mass [M] 0.417 (0.2) 0.481 0.566 0.539 0.86 (0.08) 0.585 (0.02)
log(Luminosity) [L] -2.39
Cooling age [Gyr] 0.1546 0.2290 0.4074
log(H/He) -5.713 -5.46 (0.1) -5.36 (0.3)
log(C/He)
log(Ca/He) <-8.55
log(Ca/H)
log(N/He)
log(O/He)
log(Na/He)
log(Mg/He)
log(Al/He)
log(Si/He)
log(P/He)
log(S/He)
log(Cl/He)
log(Sc/He)
log(Ti/He)
log(V/He)
log(Cr/He)
log(Mn/He)
log(Fe/He)
log(Co/He)
log(Ni/He)
log(Cu/He)
log(Zn/He)
log(Ga/He)
log(Ge/He)
log(Sr/He)
Parallax [mas] 8.83 (0.08) 8.87 (0.1) 8.83 8.83 (0.08)
Distance [pc] 113.23 (1) 113.00 112.80 (1) 111.00 87.00 113.23 113.23 (1)
Composition He He He
Proper motion (right ascension) [mas/yr] -25.69701153 (0.09) -25.52845589 (0.2) -25.697 (0.09)
Proper motion (declination) [mas/yr] -10.01980701 (0.08) -9.805938264 (0.1) -10.02 (0.08)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude 16.66 16.66
R magnitude
I magnitude
J magnitude 16.88 (0.1)
H magnitude
K magnitude
u magnitude 16.41 (0.007) 16.41 (0.007) 16.39 (0.01)
g magnitude 16.46 (0.004) 16.46 (0.004) 16.48 (0.02)
r magnitude 16.74 (0.004) 16.73 (0.004) 16.76 (0.02)
i magnitude 16.96 (0.005) 16.96 (0.005) 16.96 (0.01)
z magnitude 17.19 (0.01) 17.19 (0.01) 17.18 (0.02)
G magnitude 16.59 (0.003) 16.61 16.59 16.59 (0.003)
BP magnitude 16.55 (0.003) 16.53
RP magnitude 16.66 (0.006) 16.67
Pan g magnitude 16.53 (0.003)
Pan r magnitude 16.76 (0.003)
Pan i magnitude 16.99 (0.002)
Pan z magnitude 17.20 (0.005)
Pan y magnitude 17.38 (0.02)
E(B-V) 0.002

* 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.