LP 638-4

All names: G26-10, LSPM J2132+0015, Gaia EDR3 2687733913283870336, GCRV 72252, IDS 21270-0013 B, FBS 2129+000, LP 638-4, WD 2129+000, WD 2129+004, EGGR 145, Gaia DR2 2687733913283870336, Gaia DR3 2687733913283870336, GEN# +9.80026010, IDS 21271-0013 B, BD-00 4234B, USNO-B1.0 0902-00571211, G 26-10, UBV M 5071, WDJ213216.23+001514.40, uvby98 980026010, ** LDS 749B, NLTT 51482, JP11 5101, LP 638-004, LDS 749B, 2MASS J21321623+0015144, GEN# -0.00004234B, LTT 16294, G 93-21, SDSS J213216.33+001514.5, UBV M 42732, USNO 87, UBV 18541, CSI-00 4234 2, LAWD 87, ** KUI 107B, TIC 352817378, WD 2129+00, CSI+00-21297, CCDM J21322+0014B, L 1002-16, WDS J21322+0013B, PHL 28

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 MWDD HE Gaia DR2 Bedard et al. 2017 Tremblay et al. 2017 Stilism Bergeron et al. 2011 Zuckerman et al. 2010 Voss et al. 2007 Weidemann and Koester 1995 Wegner et al. 1987 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 21 32 16.67 (0.02) 21 32 16.66 (0.04) 21 32 16.67 21 32 16.23 (0.02) 21 32 16.66 21 32 14.69
Declination 00 15 14.83 (0.02) 00 15 14.82 (0.04) 00 15 14.83 00 15 14.40 (0.02) 00 15 14.82 00 15 05.76
Spectral type DB DB DB DB DB DB DB DB DB4 DB4
Effective temperature [K] 13330.0 (90) 13725.0 14383.0 (231) 14380.0 (350) 14380.0 (351) 14000.0 14414.0 13000.0 13000.0 13956.0 (93)
log(g) [cgs] 7.97 (0.007) 8.01 8.27 (0.1) 8.26 (0.1) 8.26 (0.1) 8.00 8.03 (0.008)
Mass [M] 0.571 (0.006) 0.595 0.75 (0.09) 0.604 (0.006)
log(Luminosity) [L] -2.36
Cooling age [Gyr] 0.2662 0.3548
log(H/He) <-6.48 (2) <-5
log(C/He) <-7 <-6.5
log(Ca/He) <-11.1
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] 23.29 (0.03) 23.40 (0.05) 23.16 (0.4) 23.29 23.29 (0.03) 23.40 (0.05) 33.10
Distance [pc] 42.94 (0.05) 42.74 (0.09) 43.20 (1) 43.18 (0.7) 49.00 42.94 42.94 (0.05) 42.74 (0.09) 30.21
Composition He He He He
Proper motion (right ascension) [mas/yr] 413.2789765 (0.03) 413.2279019 (0.08) 413.279 (0.03) 413.2279019
Proper motion (declination) [mas/yr] 27.20684724 (0.02) 27.27030436 (0.07) 27.207 (0.02) 27.27030436
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity yes
B magnitude 14.63
V magnitude 14.67 (0.03) 15.27 14.73 14.67
R magnitude 14.68
I magnitude 14.68
J magnitude 14.89 (0.04)
H magnitude 15.05 (0.09)
K magnitude 15.22 (0.1)
u magnitude 14.49 (0.004) 14.50 (0.004)
g magnitude 14.52 (0.004) 14.52 (0.004)
r magnitude 14.78 (0.004) 14.78 (0.004)
i magnitude 15.59 (0.006) 15.51 (0.007)
z magnitude 15.23 (0.006) 15.22 (0.006)
G magnitude 14.64 (0.001) 14.66 14.64 14.64 (0.003) 14.66
BP magnitude 14.60 (0.001) 14.57 14.57
RP magnitude 14.69 (0.002) 14.70 14.70
Pan g magnitude 14.56 (0.0008)
Pan r magnitude 14.79 (0.004)
Pan i magnitude 15.03 (0.002)
Pan z magnitude 15.24 (0.01)
Pan y magnitude 15.41 (0.004)
E(B-V) 0.001

* 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.