WD J0738+1835

All names: SDSS J073842.57+183509.60, SDSSJ0738, Gaia DR2 671450448046315520, Gaia EDR3 671450448046315520, SDSS J073842.56+183509.6, SDSS J073842.56+183509.06, SDSS J073842.57+183509.6, Gaia DR3 671450448046315520

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) Gaia DR2 Stilism Koester & Kepler 2015 Brinkworth et al. 2012 Dufour et al. 2012 Zuckerman et al. 2011 Dufour et al. 2010 Vincent et al. 2024 Kleinman et al. 2013 Vincent et al. 2023
Right ascension 07 38 42.58 (0.1) 07 38 42.57 07 38 42.58 (0.1) 07 38 42.58 07 38 42.57
Declination 18 35 09.33 (0.1) 18 35 09.66 18 35 09.34 (0.1) 18 35 09.33 18 35 09.64
Spectral type DBZA DBZA DBZ DB DB_DBZ DB
Effective temperature [K] 15213.0 13991.0 15719.0 (34) 13600.0 13950.0 (100) 13600.0 13600.0 (300) 14765.0 (672) 15819.0 (65)
log(g) [cgs] 7.80 8.05 8.00 (0) 8.50 8.40 (0.2) 8.50 8.50 (0.2) 8.16 (0.06) 8.43 (0.04)
Mass [M] 0.482 0.619 0.841 (0.1) 0.907 (0.1) 0.684 (0.05)
log(Luminosity) [L] -2.50 (0.1) -2.62 (0.1)
Cooling age [Gyr]
log(H/He) -5.889 <-5.66 -5.73 (0.2) -5.7 (0.3)
log(C/He)
log(Ca/He) -5.65 (0.1) -6.23 (0.1) -6.8 -6.8 (0.3)
log(Ca/H)
log(N/He)
log(O/He) -3.81 (0.2) -4 (0.2)
log(Na/He) -6.36 (0.2)
log(Mg/He) -4.68 (0.07) -4.7 (0.2)
log(Al/He) -6.39 (0.1)
log(Si/He) -4.9 (0.2) -4.9 (0.2)
log(P/He)
log(S/He)
log(Cl/He)
log(Sc/He) -9.55 (0.2)
log(Ti/He) -7.95 (0.1)
log(V/He) -8.5 (0.2)
log(Cr/He) -6.76 (0.1)
log(Mn/He) -7.11 (0.1)
log(Fe/He) -4.98 (0.09) -5.1 (0.3)
log(Co/He) -7.76 (0.2)
log(Ni/He) -6.31
log(Cu/He)
log(Zn/He)
log(Ga/He)
log(Ge/He)
log(Sr/He)
Parallax [mas] 5.83 (0.1) 5.80 (0.2) 5.83
Distance [pc] 171.66 (4) 172.54 (6) 198.00 120.00 147.00 136.00 171.66
Composition He He He
Proper motion (right ascension) [mas/yr] 12.72695104 (0.1) 12.81938568 (0.3)
Proper motion (declination) [mas/yr] -24.13668757 (0.08) -24.08965016 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk) yes yes
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.52 (0.01) 17.53 (0.01)
g magnitude 17.57 (0.005) 17.58 (0.01)
r magnitude 17.82 (0.006) 17.82 (0.01)
i magnitude 18.08 (0.008) 18.08 (0.01)
z magnitude 18.30 (0.02) 18.32 (0.03)
G magnitude 17.70 (0.007) 17.73 17.70
BP magnitude 17.65 (0.007) 17.62
RP magnitude 17.83 (0.03) 17.74
Pan g magnitude 17.61 (0.004)
Pan r magnitude 17.85 (0.004)
Pan i magnitude 18.09 (0.008)
Pan z magnitude 18.31 (0.02)
Pan y magnitude 18.52 (0.02)
E(B-V) 0.008

* 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.