GD 190

All names: Balloon 82900002, uvby98 610060190, Gaia EDR3 1197720457346241152, Gaia DR3 1197720457346241152, SDSS J154419.45+180643.2, GD 190, GEN# +6.10060190, LAMOST J154419.46+180642.8, 1542+182, WDJ154419.45+180643.78, WD 1542+182, Gaia DR2 1197720457346241152, SDSS J154419.46+180643.2, CSI+18-15421, PG 1542+183, 1SWASP J154419.46+180643.9, EGGR 193, GCRV 21679

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 Leggett et al. 2018 MWDD HE Gaia DR2 Stilism Bergeron et al. 2011 Farihi et al. 2010 Voss et al. 2007 Petitclerc et al. 2005 Provencal et al. 2000 Beauchamp et al. 1999 Wegner et al. 1987 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 15 44 19.46 (0.02) 15 44 19.46 (0.03) 15 44 19.46 15 44 19.45 (0.02) 15 44 19.46 15 44 19.61
Declination 18 06 41.78 (0.02) 18 06 41.85 (0.02) 18 06 41.78 18 06 43.78 (0.02) 18 06 41.85 18 06 42.84
Spectral type DB DB2.4 DB DB DBQ DB DB DB2 DB2
Effective temperature [K] 20780.0 (270) 20618.0 (1584) 19634.0 22630.0 (984) 23186.0 23000.0 (1000) 21500.0 18000.0 21768.0 (318)
log(g) [cgs] 8.02 (0.008) 8.11 (0.06) 7.96 8.04 (0.06) 7.97 8.00 8.05 (0.007)
Mass [M☉] 0.608 (0.007) 0.661 (0.05) 0.574 0.63 (0.03) 0.585 0.627 (0.006)
log(Luminosity) [L☉] -1.43
Cooling age [Gyr] 0.0790 (0.03) 0.0678 0.0468
log(H/He) <-4.84 (1) <-6.5 <-5
log(C/He) -5.5 (0.3) -5.8 (0.4)
log(Ca/He)
log(Ca/H)
log(N/He) <-7.4
log(O/He)
log(Na/He)
log(Mg/He)
log(Al/He)
log(Si/He) <-8
log(P/He) <-8.8
log(S/He) <-7.7
log(Cl/He) <-7.9
log(Sc/He)
log(Ti/He)
log(V/He) <-7.8
log(Cr/He) <-7.8
log(Mn/He)
log(Fe/He) <-7.9
log(Co/He) <-7.3
log(Ni/He) <-6.7
log(Cu/He)
log(Zn/He)
log(Ga/He)
log(Ge/He)
log(Sr/He)
Parallax [mas] 15.46 (0.03) 16.52 (0.5) 15.45 (0.04) 15.46 15.46 (0.03) 15.45 (0.04)
Distance [pc] 64.67 (0.1) 60.53 (2) 64.71 (0.2) 67.00 64.67 64.67 (0.1) 64.71 (0.2)
Composition He He He He He
Proper motion (right ascension) [mas/yr] 3.110180339 (0.03) 3.043069459 (0.06) 3.11 (0.03) 3.043069459
Proper motion (declination) [mas/yr] -124.4585922 (0.02) -124.6787595 (0.05) -124.459 (0.02) -124.6787595
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 14.56
V magnitude 14.72 14.70 14.72 14.68
R magnitude 14.77
I magnitude 14.85
J magnitude
H magnitude
K magnitude
u magnitude 14.30 (0.004) 14.30 (0.004)
g magnitude 14.46 (0.003) 14.46 (0.003)
r magnitude 14.84 (0.004) 14.84 (0.004)
i magnitude 15.14 (0.004) 15.14 (0.004)
z magnitude 15.43 (0.006) 15.43 (0.006)
G magnitude 14.66 (0.001) 14.67 14.66 14.66 (0.003) 14.67
BP magnitude 14.56 (0.001) 14.50 14.50
RP magnitude 14.83 (0.001) 14.83 14.83
Pan g magnitude 14.54 (0.003)
Pan r magnitude 14.87 (0.003)
Pan i magnitude 15.17 (0.002)
Pan z magnitude 15.40 (0.005)
Pan y magnitude 15.59 (0.007)
E(B-V) 0.008

* 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.