SDSS J155708.02+041156.4

All names: GALEX J155708.0+041156, SDSS J155708.04+041156.52, SDSS J155708.04+041156.5, SDSS J155708.02+041156.4, Gaia DR3 4425265338065688064, Gaia DR2 4425265338065688064, Gaia EDR3 4425265338065688064

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 SDSS DR10 Hardy et al. 2023a MWDD H Gaia DR2 Stilism Ferrario et al. 2015 Kepler et al. 2015 Vincent et al. 2024 Simbad Vincent et al. 2023
Right ascension 15 57 08.04 (0.09) 15 57 08.03 15 57 08.03 15 57 08.04 (0.1) 15 57 08.04 15 57 08.02 (0.09)
Declination 04 11 56.50 (0.07) 04 11 56.44 04 11 56.44 04 11 56.49 (0.07) 04 11 56.50 04 11 56.39 (0.07)
Spectral type DAH DA DA DAH DB: DAH DAH
Effective temperature [K] 24847.0 (1220) 18313.0 23000.0 (1000) 21947.0 (1484)
log(g) [cgs] 9.04 (0.04) 8.82 9.50 (1) 9.08 (0.05)
Mass [M] 1.2177321577774254 (0.04) 1.117 1.222 (0.02)
log(Luminosity) [L]
Cooling age [Gyr] 0.4459
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] 9.03 (0.1) 8.70 (0.1) 9.03 9.03 (0.1)
Distance [pc] 110.76 (1) 114.96 (2) 110.76 110.76 (1)
Composition H
Proper motion (right ascension) [mas/yr] 10.88256299 (0.1) 10.97547063 (0.2) 10.883 (0.1)
Proper motion (declination) [mas/yr] 6.578989839 (0.09) 6.451329823 (0.2) 6.579 (0.09)
Variability
Magnetic yes yes
Bd [MG] 43.83329246938865 41
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.28 (0.009) 17.28 (0.009) 17.28 (0.01) 17.28 (0.009)
g magnitude 17.48 (0.005) 17.48 (0.005) 17.48 (0.01) 17.48 (0.005)
r magnitude 17.81 (0.007) 17.81 (0.007) 17.81 (0.01) 17.81 (0.007)
i magnitude 18.13 (0.009) 18.13 (0.009) 18.13 (0.01) 18.13 (0.009)
z magnitude 18.36 (0.03) 18.36 (0.03) 18.36 (0.03) 18.36 (0.03)
G magnitude 17.64 (0.008) 17.67 17.64 17.64 (0.003)
BP magnitude 17.55 (0.008) 17.52
RP magnitude 17.84 (0.02) 17.84
Pan g magnitude 17.51 (0.003)
Pan r magnitude 17.83 (0.004)
Pan i magnitude 18.14 (0.003)
Pan z magnitude 18.35 (0.01)
Pan y magnitude 18.54 (0.03)
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.