LAWD 74

All names: PLX 4519.1, WD 1917-07, TYC 5709-698-1, CSI-07-19179 1, LTT 7658, LAWD 74, LP 692-16, GJ 754.1 A, WD 1917-074, HIC 95071, WD 1917-077, UBV 16351, USNO 69, NSV 11920, Zkh 291, TIC 3567346, WDS J19206-0740A, Gaia DR1 4201781727042370176, Gaia EDR3 4201781696994082944, UBV M 43022, CCDM J19206-0740A, L 923-21, Gaia DR3 4201781696994073472, UBV M 43021, WDJ192034.92-074000.07, LD S678A, VVO 420, NLTT 47693, ** LDS 678A, IDS 19152-0751 A, CNS5 4799, 2MASS J19203492-0739597, EGGR 131, GJ 9653, Gaia DR2 4201781696994073472, HIP 95071, GJ 754.1A, LDS678B, LDS 678A

Parameter Unit Gaia EDR3 Pan-STARRS DR1 O'Brien et al. 2024 Gaia DR2 Subasavage et al. 2017 Tremblay et al. 2017 Stilism Holberg et al. 2016 Sion et al. 2014 Giammichele et al. 2012 Holberg et al. 2008 Voss et al. 2007 Weidemann and Koester 1995 Oswalt et al. 1991 Koester et al. 1982a Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 19 20 33.38 (0.03) 19 20 34.86 (0.06) 19 20 34.92 19 20 34.80 19 20 34.86 19 20 34.92 (0.03) 19 20 34.86 19 20 36.29
Declination -07 39 46.60 (0.02) -07 40 02.57 (0.05) -07 40 00.00 -07 39 57.60 -07 40 02.66 -07 40 00.07 (0.02) -07 40 02.57 -07 39 20.16
Spectral type DBQA DBQA DBQA DBQZ DBQZ4.9 DBQA DBQA DC DB DBQA5 DBZ5
Effective temperature [K] 10805.0 (117) 11220.0 (300) 10400.0 (360) 10174.0 (357) 10396.0 10396.0 (357) 10195.0 10000.0 10200.0 (500) 9700.0 (500) 10721.0 (56)
log(g) [cgs] 8.05 (0.02) 8.15 (0.03) 7.83 (0.04) 8.06 (0.04) 8.00 7.90 (0.1) 8.06 (0.007)
Mass [M] 0.612 (0.01) 0.67 (0.02) 0.62 (0.02) 0.62 (0.02) 0.576 0.55 (0.05) 0.42 (0.09) 0.62 (0.005)
log(Luminosity) [L] -2.73 (0.05) -2.81
Cooling age [Gyr] 0.5700 (0.05) 0.6500 0.6500 8.2800
log(H/He) -5.16 4.7 (0.2)
log(C/He) -5.84 -6 -6.7 (0.2) -6
log(Ca/He)
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] 95.18 (0.03) 95.18 (0.03) 95.25 (0.07) 95.84 (0.4) 95.10 (0.6) 97.00 (2) 99.20 (2) 99.20 (2) 0.10 95.18 95.18 (0.03) 95.25 (0.07) 98.80 (3)
Distance [pc] 10.51 (0.003) 10.51 (0.003) 10.50 (0.008) 10.43 (0.04) 10.52 (0.06) 10.31 (0.2) 10.08 10.10 (0.3) 10.08 10204.08 10.51 10.51 (0.003) 10.50 (0.008) 10.12 (0.3)
Composition He He He He He
Proper motion (right ascension) [mas/yr] -70.59099364 (0.03) -61.279 (0.1) -61.224 (0.03) -61.27922856
Proper motion (declination) [mas/yr] -177.9740371 (0.02) -161.774 (0.1) -161.846 (0.02) -161.7736786
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity WDMS WDMS yes
B magnitude 12.34 12.35
V magnitude 12.31 12.29 (0.01) 12.30 12.28 12.29
R magnitude 12.25 12.23
I magnitude 12.22 12.16
J magnitude 12.35 (0.03) 12.35 12.35 (0.03)
H magnitude 12.36 (0.03) 12.36 12.36 (0.03)
K magnitude 10.42 (0.03) 12.42 12.42 (0.03)
u magnitude 12.58
g magnitude
r magnitude
i magnitude
z magnitude
G magnitude 10.97 (0.002) 12.27 12.25 (0.001) 12.25 12.25 (0.003) 12.27
BP magnitude 12.37 (0.002) 12.23 12.23
RP magnitude 9.81 (0.0008) 12.22 12.22
Pan g magnitude 12.27 (0.001)
Pan r magnitude 13.44 (0.001)
Pan i magnitude 16.10 (0.4)
Pan z magnitude 12.78 (0.001)
Pan y magnitude 12.88 (0.002)
E(B-V) 0.000

* 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.