SDSS J084019.99+402730.7

All names: WD 0837+406, Gaia DR3 911668965342932992, Gaia DR2 911668965342932992, SDSS J084020.00+402730.7, Gaia EDR3 911668965342932992, SDSS J084019.99+402730.8, SDSS J084019.99+402730.7, GALEX J084019.9+402730, SDSS J084020.00+402730.8

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Bedard et al. 2020 MWDD H Gaia DR2 Stilism Tremblay et al. 2011 Vincent et al. 2024 Simbad Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 08 40 20.01 (0.1) 08 40 20.00 08 40 20.01 (0.2) 08 40 20.01 08 40 20.00 (0.1) 08 40 20.00 08 40 19.73 08 40 20.00
Declination 40 27 29.98 (0.08) 40 27 30.80 40 27 30.01 (0.1) 40 27 29.98 40 27 30.88 (0.08) 40 27 30.79 40 27 26.28 40 27 30.82
Spectral type DA DA DA DA DA DA_auto DA DA DA
Effective temperature [K] 30469.0 (238) 26744.0 31260.0 (250) 28310.0 (1677) 30508.0 (203) 30882.0 (189)
log(g) [cgs] 7.77 (0.06) 7.81 7.78 (0.06) 7.95 (0.09) 7.77 (0.04) 7.77 (0.04)
Mass [M] 0.53 (0.03) 0.544 0.55 (0.03) 0.617 (0.07) 0.542 (0.02)
log(Luminosity) [L] -0.71 (0.04)
Cooling age [Gyr] 0.0081 (0.0004) 0.0132 0.0087
log(H/He)
log(C/He)
log(Ca/He)
log(Ca/H)
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] 2.53 (0.2) 2.35 (0.3) 2.53 2.53 (0.2)
Distance [pc] 394.55 (24) 424.72 (46) 394.55 394.56 (24)
Composition H H H
Proper motion (right ascension) [mas/yr] 4.660751085 (0.2) 4.626767371 (0.4) 4.661 (0.2) 8.0
Proper motion (declination) [mas/yr] -56.304746 (0.1) -56.10513902 (0.2) -56.305 (0.1) -62.5
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.58 (0.01) 17.58 (0.01) 17.57 (0.02) 17.81 17.57 (0.02)
g magnitude 17.82 (0.006) 17.82 (0.006) 17.82 (0.02) 17.81 17.82 (0.02)
r magnitude 18.28 (0.007) 18.28 (0.007) 18.27 (0.01) 18.27 (0.01)
i magnitude 18.60 (0.01) 18.60 (0.01) 18.61 (0.02) 18.62 (0.02)
z magnitude 18.88 (0.03) 18.88 (0.03) 18.97 (0.04) 18.97 (0.04)
G magnitude 18.07 (0.01) 18.10 18.07 18.07 (0.003)
BP magnitude 17.95 (0.01) 17.90
RP magnitude 18.30 (0.04) 18.32
Pan g magnitude 17.89 (0.004)
Pan r magnitude 18.29 (0.008)
Pan i magnitude 18.65 (0.005)
Pan z magnitude 18.94 (0.01)
Pan y magnitude 19.20 (0.1)
E(B-V) 0.027

* 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.