WD 1540+505

All names: Gaia EDR3 1402785732473315968, SBSS 1540+505, WD 1540+505, SDSS J154201.50+502532.1, Gaia DR2 1402785732473315968, SDSS J154201.50+502532.10, GALEX J154201.4+502531, Gaia DR3 1402785732473315968, SDSS J154201.50+502532.0, SDSS J154201.48+502532.0, USNO-B1.0 1404-00267106

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Bedard et al. 2020 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Eisenstein et al. 2006 Vincent et al. 2024 Simbad White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 15 42 01.46 (0.05) 15 42 01.48 15 42 01.46 (0.07) 15 42 01.49 15 42 01.46 15 42 01.49 (0.05) 15 42 01.13 15 42 01.50
Declination 50 25 32.20 (0.05) 50 25 32.04 50 25 32.19 (0.08) 50 25 32.01 50 25 32.20 50 25 32.00 (0.05) 50 25 30.00 50 25 32.06
Spectral type DB DB DB DB DB DB DBH: DB
Effective temperature [K] 32668.0 (419) 31766.0 32141.0 28249.0 31027.0 (247) 33200.0 (100) 32900.0 (1295) 30288.0 (273)
log(g) [cgs] 7.78 (0.04) 7.81 8.04 7.92 7.64 (0.03) 7.84 (0.02) 8.04 (0.03) 7.84 (0.03)
Mass [M] 0.51 (0.02) 0.524 0.644 0.57 0.642 (0.03)
log(Luminosity) [L] -0.62 (0.04)
Cooling age [Gyr] 0.0069 (0.0005) 0.0121
log(H/He) <-3.786 <-2.99
log(C/He)
log(Ca/He) <-4.0
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] 4.30 (0.05) 4.34 (0.08) 4.30 4.30 (0.05)
Distance [pc] 232.39 (3) 230.29 (4) 298.00 232.39 232.39 (3)
Composition He He
Proper motion (right ascension) [mas/yr] -20.04070169 (0.06) -19.90547146 (0.1) -20.041 (0.06)
Proper motion (declination) [mas/yr] 12.29884181 (0.07) 12.56868197 (0.2) 12.299 (0.07)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 17.00
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 16.51 (0.006) 16.50 (0.02) 16.51 (0.006) 16.77 16.51 (0.02)
g magnitude 16.75 (0.004) 16.78 (0.02) 16.75 (0.004) 16.77 16.78 (0.02)
r magnitude 17.16 (0.005) 17.14 (0.01) 17.16 (0.005) 17.15 (0.01)
i magnitude 17.52 (0.006) 17.50 (0.01) 17.52 (0.006) 17.52 (0.02)
z magnitude 17.87 (0.02) 17.81 (0.02) 17.87 (0.02) 17.84 (0.03)
G magnitude 16.96 (0.005) 16.98 16.96 16.96 (0.003)
BP magnitude 16.85 (0.005) 16.76
RP magnitude 17.21 (0.009) 17.19
Pan g magnitude 16.81 (0.004)
Pan r magnitude 17.19 (0.003)
Pan i magnitude 17.53 (0.002)
Pan z magnitude 17.78 (0.01)
Pan y magnitude 17.98 (0.01)
E(B-V) 0.017

* 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.