SDSS J155511.88+343349.8

All names: SDSS J155511.87+343350.58, SDSS J155511.87+343350.5, Gaia EDR3 1371790701549666688, Gaia DR2 1371790701549666688, Gaia DR3 1371790701549666688, GALEX J155511.8+343350, SDSS J155511.88+343349.8

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR10 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Kepler et al. 2015 Vincent et al. 2024 Simbad Vincent et al. 2023
Right ascension 15 55 11.85 (0.06) 15 55 11.89 15 55 11.85 (0.08) 15 55 11.85 15 55 11.90 (0.06)
Declination 34 33 50.62 (0.07) 34 33 49.82 34 33 50.59 (0.1) 34 33 50.62 34 33 49.53 (0.07)
Spectral type DBA DBA DB DB DB
Effective temperature [K] 17103.0 17372.0 14948.0 16700.0 (164) 16639.0 (164) 15339.0 (603)
log(g) [cgs] 8.18 8.08 7.85 8.07 (0.1) 7.97 (0.09) 7.87 (0.05)
Mass [M] 0.701 0.643 0.505 0.557 (0.04) 0.519 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 0.1579
log(H/He) -4.265 <-4.35
log(C/He)
log(Ca/He) -5.77 (0.3)
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] 4.50 (0.09) 4.51 (0.1) 4.50 4.50 (0.09)
Distance [pc] 222.36 (4) 221.79 (6) 212.00 222.36 222.36 (4)
Composition He
Proper motion (right ascension) [mas/yr] -39.9385052 (0.07) -39.77584433 (0.2) -39.939 (0.07)
Proper motion (declination) [mas/yr] 68.46292566 (0.1) 68.29724296 (0.2) 68.463 (0.1)
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 (0.02) 17.58 (0.01)
g magnitude 17.64 (0.005) 17.65 (0.02) 17.64 (0.005)
r magnitude 17.96 (0.007) 17.97 (0.02) 17.96 (0.007)
i magnitude 18.20 (0.009) 18.19 (0.02) 18.20 (0.009)
z magnitude 18.56 (0.03) 18.56 (0.04) 18.56 (0.03)
G magnitude 17.78 (0.008) 17.81 17.78 17.78 (0.003)
BP magnitude 17.73 (0.008) 17.70
RP magnitude 17.89 (0.01) 17.87
Pan g magnitude 17.68 (0.003)
Pan r magnitude 17.94 (0.004)
Pan i magnitude 18.20 (0.007)
Pan z magnitude 18.42 (0.01)
Pan y magnitude 18.59 (0.02)
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.