GD 194

All names: LSPM J1552+1810, GALEX J155226.3+181020, J1552+1810, SDSS J155226.33+181019.2, PG 1550+183, GD 194, EGGR 273, WDJ155226.38+181018.69, LTT 14705, Gaia DR3 1202826348825240832, PM J15524+1810, LP 443-69, WD 1550+183, GSC 01499-01571, 15524+1810, GEN# +6.10060194, FB 163, NLTT 41399, USNO-B1.0 1081-00278473, TIC 422975717, WD 1550+18, Gaia DR2 1202826348825240832, Gaia EDR3 1202826348825240832, KUV 15502+1819, 2MASS J15522636+1810185, SDSS J155226.32+181019.1, L 1273-18

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 O'Brien et al. 2024 McCleery et al. 2020 Kilic et al. 2020 MWDD H Gaia DR2 Stilism Limoges et al. 2015 Gianninas et al. 2011 Koester et al. 2009 Liebert et al. 2005 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 15 52 26.20 (0.02) 15 52 26.21 (0.04) 15 52 26.21 (0.04) 15 52 26.20 15 52 26.38 (0.02) 15 52 26.21 15 52 27.14
Declination 18 10 20.56 (0.02) 18 10 20.50 (0.03) 18 10 20.50 (0.03) 18 10 20.56 18 10 18.69 (0.02) 18 10 20.50 18 10 12.36
Spectral type DA DA DA DA DA DA DA DA DA3.4 DA4
Effective temperature [K] 14734.0 (138) 14813.0 (217) 14703.9 (98) 14734.0 (138) 14086.0 14810.0 (295) 14910.0 (305) 14860.0 (72) 14260.0 (271) 14919.0 (116)
log(g) [cgs] 8.41 (0.006) 8.41 (0.02) 8.41 (0.009) 8.41 (0.006) 8.37 8.37 (0.05) 8.36 (0.04) 8.25 (0.007) 8.25 (0.05) 8.42 (0.006)
Mass [M] 0.869 (0.006) 0.866 (0.01) 0.868 (0.006) 0.843 0.84 (0.03) 0.84 (0.03) 0.77 (0.03) 0.875 (0.005)
log(Luminosity) [L] -2.37 -2.36
Cooling age [Gyr] 0.4263 0.3890
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] 27.12 (0.03) 27.12 (0.03) 27.13 (0.05) 27.13 (0.05) 27.12 27.12 (0.03) 27.13 (0.05)
Distance [pc] 36.87 (0.04) 36.87 (0.04) 36.86 (0.07) 36.86 (0.07) 40.50 (2) 41.00 41.00 36.87 36.87 (0.04) 36.86 (0.07)
Composition H H H H H
Proper motion (right ascension) [mas/yr] -154.7808395 (0.03) -154.7735449 (0.07) -154.781 (0.03) -154.7735449
Proper motion (declination) [mas/yr] 116.7280373 (0.03) 116.6693594 (0.06) 116.728 (0.03) 116.6693594
Variability NOV
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 14.94
V magnitude 14.83 14.79
R magnitude 15.20
I magnitude
J magnitude 15.17 (0.05)
H magnitude 15.31 (0.1)
K magnitude 15.28 (0.1)
u magnitude 15.22 (0.006) 15.22 (0.006)
g magnitude 15.04 (0.004) 15.04 (0.004)
r magnitude 16.64 (0.01) 16.64 (0.01)
i magnitude 15.36 (0.005) 15.36 (0.005)
z magnitude 15.38 (0.006) 15.38 (0.006)
G magnitude 14.82 (0.001) 14.84 14.84 14.82 14.82 (0.003) 14.84
BP magnitude 14.79 (0.001) 14.78 14.78
RP magnitude 14.91 (0.001) 14.91 14.91
Pan g magnitude 14.73 (0.005)
Pan r magnitude 14.96 (0.001)
Pan i magnitude 15.22 (0.003)
Pan z magnitude 15.45 (0.004)
Pan y magnitude 15.60 (0.005)
E(B-V) 0.002

* Constant surface field

Special notes:

Spectra

Controls

Normalize at:
Normalize by mean flux

Range:

x: to
y: to

Spectra available:

Spectra without link are available upon request

Absorption lines

Photometric filters

BVRI
ugriz

Photometric fit





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.