A2 235

All names: A2 235, OMHR 147829, Gaia DR2 3958573019152503424, SDSS J125751.83+263621.50, [BCF91] 195, US 59, SDSS J125751.83+263621.5, OMHR J125751.90+263621.6, LAMOST J125751.82+263621.4, Gaia EDR3 3958573023448132992, SDSS J125751.82+263621.4, GALEX J125751.8+263621, Gaia DR3 3958573023448132992

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Guo et al. 2015 Koester & Kepler 2015 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 12 57 51.82 (0.2) 12 57 51.83 12 57 51.82 (0.3) 12 57 51.83 (0.2) 12 57 51.83
Declination 26 36 21.40 (0.2) 26 36 21.44 26 36 21.39 (0.3) 26 36 21.31 (0.2) 26 36 21.45
Spectral type DB DB DB DB DB
Effective temperature [K] 20780.0 19659.0 19222.0 20654.0 (452) 22993.0 (1143)
log(g) [cgs] 7.98 7.88 7.87 8.00 (0) 8.03 (0.09)
Mass [M] 0.589 0.529 0.528 0.617 (0.05)
log(Luminosity) [L]
Cooling age [Gyr] 0.0626
log(H/He) <-4.82 <-3.64
log(C/He)
log(Ca/He) <-4.19
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] 1.90 (0.3) 2.04 (0.4) 1.90 (0.3)
Distance [pc] 526.48 (74) 490.50 (98) 467.00 526.48 (74)
Composition He
Proper motion (right ascension) [mas/yr] -12.46580409 (0.3) -12.28329301 (0.6) -12.466 (0.3)
Proper motion (declination) [mas/yr] 5.389243601 (0.3) 5.249185432 (0.5) 5.389 (0.3)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 19.40
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.67 (0.02) 18.68 (0.02) 18.70 (0.03)
g magnitude 18.84 (0.009) 18.84 (0.009) 18.85 (0.02)
r magnitude 19.16 (0.01) 19.16 (0.01) 19.17 (0.02)
i magnitude 19.42 (0.02) 19.42 (0.02) 19.44 (0.03)
z magnitude 19.57 (0.07) 19.57 (0.07) 19.60 (0.07)
G magnitude 19.01 (0.02) 19.03 19.01 (0.004)
BP magnitude 18.92 (0.02) 18.87
RP magnitude 19.07 (0.05) 19.18
Pan g magnitude 18.85 (0.01)
Pan r magnitude 19.18 (0.01)
Pan i magnitude 19.49 (0.007)
Pan z magnitude 19.72 (0.02)
Pan y magnitude 19.84 (0.05)
E(B-V) 0.015

* 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.