WD 1557+192

All names: Gaia DR3 1203312813999856896, WD 1557+192, Gaia DR2 1203312813999856896, SDSS J155921.07+190408.1, Gaia EDR3 1203312813999856896, SDSS J155921.08+190408.1, SDSS J155921.08+190407.8, KUV 15571+1913, SDSS J155921.08+190407.86

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR10 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Kepler et al. 2015 Koester et al. 2014 Bergeron et al. 2011 Voss et al. 2007 Vincent et al. 2024 Simbad White Dwarf Catalog (McCook & Sion 1999) Vincent et al. 2023
Right ascension 15 59 21.07 (0.04) 15 59 21.08 15 59 21.08 15 59 21.07 (0.06) 15 59 21.07 15 59 21.08 (0.04) 15 59 20.78
Declination 19 04 07.57 (0.04) 19 04 08.11 19 04 08.11 19 04 07.59 (0.05) 19 04 07.57 19 04 08.30 (0.04) 19 04 08.40
Spectral type DBA DBA_known DBA DB DB DB DB
Effective temperature [K] 21382.0 18549.0 17309.0 20685.0 (114) 21264.0 (500) 19570.0 19570.0 (558) 18690.0 18281.0 (541)
log(g) [cgs] 8.08 7.99 7.88 7.99 (0.02) 7.93 (0.001) 8.15 8.15 (0.07) 8.10 7.97 (0.03)
Mass [M] 0.647 0.588 0.527 0.5670000000000001 (0.007) 0.68 (0.04) 0.654 0.576 (0.02)
log(Luminosity) [L] -1.75
Cooling age [Gyr] 0.0976 0.1096 1.2230
log(H/He) -3.87 -3.8 (0.2) -4.37 (0.3) -4.88
log(C/He) <-7.8
log(Ca/He) <-5.46
log(Ca/H)
log(N/He)
log(O/He)
log(Na/He)
log(Mg/He)
log(Al/He)
log(Si/He) <-8.1
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] 7.11 (0.05) 7.01 (0.07) 7.11 7.11 (0.05)
Distance [pc] 140.67 (1) 142.59 (1) 151.00 78.00 140.67 140.67 (1)
Composition He He He
Proper motion (right ascension) [mas/yr] -7.389094136 (0.04) -7.336579625 (0.1) -7.389 (0.04)
Proper motion (declination) [mas/yr] -45.71739365 (0.05) -45.69692421 (0.09) -45.717 (0.05)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 15.50
V magnitude 15.40 15.40 15.40
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 16.22 (0.006) 16.22 (0.006) 16.24 (0.03) 16.22 (0.006)
g magnitude 16.35 (0.004) 16.35 (0.004) 16.40 (0.02) 16.35 (0.004)
r magnitude 16.71 (0.004) 16.71 (0.004) 16.73 (0.01) 16.71 (0.004)
i magnitude 16.97 (0.005) 16.97 (0.005) 16.98 (0.01) 16.98 (0.005)
z magnitude 17.27 (0.01) 17.27 (0.01) 17.27 (0.02) 17.27 (0.01)
G magnitude 16.52 (0.004) 16.54 16.52 16.52 (0.003)
BP magnitude 16.45 (0.004) 16.39
RP magnitude 16.66 (0.007) 16.66
Pan g magnitude 16.40 (0.003)
Pan r magnitude 16.70 (0.003)
Pan i magnitude 16.99 (0.003)
Pan z magnitude 17.21 (0.004)
Pan y magnitude 17.40 (0.02)
E(B-V) 0.028

* 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.