GJ 742

All names: NLTT 47348, CNS5 4728, WD 1900+705, 19001+7039, PLX 4440.00, Gaia DR2 2262849634963004416, AC +70 8247, GJ 742, LAWD 73, AP J19001024+7039512, [SPB96] 1935, GW+70 8247, TIC 229797408, USNO-B1.0 1606-00125381, LTT 15585, PM J19001+7039, CSI+70-19007, WDJ190010.25+703951.42, AC +70 8247-0, LFT 1446, WD 1900+706, WISEA J190010.44+703956.7, G 260-15, uvby98 980260015, WD 1900+70, GEN# +9.80260015, LSPM J1900+7039, PLX 4440, LHS 3424, Gaia DR3 2262849634963004416, Gaia EDR3 2262849634963004416, 2MASS J19001024+7039512, USNO 350, J1900+7039, EGGR 129, UBV 16196

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Jewett et al. 2024 O'Brien et al. 2024 McCleery et al. 2020 MWDD H Gaia DR2 Stilism Holberg et al. 2016 Ferrario et al. 2015 Limoges et al. 2015 Sion et al. 2014 Giammichele et al. 2012 Holberg et al. 2008 Bergeron et al. 2001 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999)
Right ascension 19 00 10.53 (0.01) 19 00 10.52 (0.03) 19 00 10.52 (0.03) 19 00 10.08 19 00 10.53 19 00 10.25 (0.01) 19 00 10.52 19 00 10.42
Declination 70 39 59.50 (0.02) 70 39 59.25 (0.03) 70 39 59.25 (0.03) 70 39 50.40 70 39 59.50 70 39 51.42 (0.02) 70 39 59.25 70 39 33.12
Spectral type DAP DAH DAP DAP DAP DA DAP DAP4.2 DAP DAP DC DB DAP4.5 DXP5
Effective temperature [K] 11615.0 (100) 12540.0 (143) 12144.4 (83) 11617.0 11517.0 (460) 16000.0 11880.0 (744) 11835.0 11835.0 (460) 12070.0 (990) 11547.0 (50)
log(g) [cgs] 8.60 8.67 (0.01) 8.64 (0.009) 8.61 8.46 (0.05) 8.54 (0.04) 8.53 (0.04) 8.58 (0.03) 8.53 (0.005)
Mass [M] 0.988 (0.006) 1.029 (0.008) 0.988 0.9 (0.03) 0.95 (0.02) 0.93 (0.02) 0.93 (0.02) 0.95 (0.02) 0.927 (0.004)
log(Luminosity) [L] -2.88 -2.88 -2.88 (0.03)
Cooling age [Gyr] 1.1800 (0.04) 1.1380 0.8600 0.9100 0.9400 (0.09)
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] 77.67 (0.02) 77.67 (0.02) 77.65 (0.03) 77.65 (0.03) 77.00 (2) 77.00 (2) 77.00 (2) 77.00 (2) 77.00 (2) 77.67 77.67 (0.02) 77.65 (0.03) 74.00
Distance [pc] 12.88 (0.003) 12.87 (0.003) 12.88 (0.005) 12.88 (0.005) 12.99 (0.4) 13.00 (2) 12.98 13.00 (0.4) 12.99 12.99 (0.4) 12.88 12.88 (0.003) 12.88 (0.005) 13.51
Composition H H H H He He H? He
Proper motion (right ascension) [mas/yr] 85.81000045 (0.02) 85.77392217 (0.05) 85.81 (0.02) 85.77392217
Proper motion (declination) [mas/yr] 505.1496152 (0.02) 505.0499376 (0.07) 505.15 (0.02) 505.0499376
Variability
Magnetic yes yes yes yes yes
Bd [MG] 100 320 (20)
Infrared excess (disk)
Binarity
B magnitude 13.31 13.31 13.24
V magnitude 13.23 13.25 13.25
R magnitude 13.24 13.24 13.50
I magnitude 13.23 13.23
J magnitude 13.33 13.33 (0.02)
H magnitude 13.44 13.44 (0.03)
K magnitude 13.42 13.42 (0.05)
u magnitude
g magnitude
r magnitude
i magnitude
z magnitude
G magnitude 13.25 (0.001) 13.26 13.26 13.25 13.25 (0.003) 13.26
BP magnitude 13.23 (0.001) 13.20 13.20
RP magnitude 13.25 (0.0008) 13.25 13.25
Pan g magnitude 13.22 (0.006)
Pan r magnitude 13.36 (0.003)
Pan i magnitude 13.64 (0.0003)
Pan z magnitude 13.79 (0.006)
Pan y magnitude 13.86 (0.006)
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.