SDSS J154049.20+453322.5

All names: Gaia DR2 1397739352059242624, Gaia DR3 1397739352059242624, GALEX J154049.1+453323, SDSS J154049.20+453322.60, WD 1539+457, SDSS J154049.20+453322.5, SDSS J154049.20+453322.6, Gaia EDR3 1397739352059242624

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Simbad Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 15 40 49.20 (0.4) 15 40 49.20 15 40 49.20 (0.5) 15 40 49.20 (0.4) 15 40 49.20 15 40 48.82 15 40 49.20
Declination 45 33 22.68 (0.4) 45 33 22.55 45 33 22.67 (0.6) 45 33 22.58 (0.4) 45 33 22.57 45 33 19.44 45 33 22.56
Spectral type DB: DBAZ DB: DB: DBAZ: DB
Effective temperature [K] 14929.0 13084.0 11603.0 14437.0 (579) 14592.0 (672)
log(g) [cgs] 7.38 8.16 7.97 7.50 (0.3) 7.61 (0.4)
Mass [M] 0.312 0.682 0.568
log(Luminosity) [L]
Cooling age [Gyr] 0.4039
log(H/He) -5.319
log(C/He)
log(Ca/He)
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] 2.36 (0.4) 2.10 (0.5) 2.36 (0.4)
Distance [pc] 423.39 (80) 476.41 (124) 423.39 (80)
Composition He
Proper motion (right ascension) [mas/yr] 3.135964116 (0.6) 2.797230594 (1) 3.136 (0.6) 0.9
Proper motion (declination) [mas/yr] 5.718772401 (0.6) 5.685374665 (1) 5.719 (0.6) 1.2
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 20.14 (0.04) 20.14 (0.05) 20.14 (0.04) 20.13 20.15 (0.04)
g magnitude 20.13 (0.02) 20.13 (0.02) 20.14 (0.02) 20.13 20.14 (0.02)
r magnitude 20.39 (0.03) 20.39 (0.03) 20.38 (0.04) 20.38 20.38 (0.03)
i magnitude 20.57 (0.04) 20.56 (0.04) 20.57 (0.04) 20.57 20.57 (0.04)
z magnitude 20.70 (0.2) 20.70 (0.2) 20.70 (0.2) 20.71 20.69 (0.2)
G magnitude 20.23 (0.06) 20.31 20.23 (0.006)
BP magnitude 20.20 (0.06) 20.04
RP magnitude 20.05 (0.09) 20.34
Pan g magnitude 20.16 (0.03)
Pan r magnitude 20.39 (0.03)
Pan i magnitude 20.55 (0.03)
Pan z magnitude 20.67 (0.03)
Pan y magnitude 19.63 (0.2)
E(B-V) 0.020

* 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.