GJ 742

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

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 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 10.25 (0.03) 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 51.42 (0.03) 70 39 59.25 70 39 33.12
Spectral type DAP DAH DAP DAP DAP DA DAP DAP4.2 DAP DAP DC 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)
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)
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)
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) 77.65 (0.03) 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 (0.005) 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) 85.774 (0.05) 85.77392217
Proper motion (declination) [mas/yr] 505.1496152 (0.02) 505.0499376 (0.07) 505.05 (0.07) 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 13.26 (0.0004) 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.