HZ 21

All names: uvby98 620020086, TIC 359113258, SDSS J121356.22+325631.5, GSC 02527-02161, GALEX J121356.3+325633, 2MASS J12135625+3256314, HZ 21, Gaia EDR3 4016474027321256704, 1SWASP J121356.28+325631.6, [TFW97] J121356.41+325630.90, WD 1211+332, EGGR 86, FB 88, UBV 10985, PG 1211+332, LAMOST J121356.34+325633.0, Gaia DR2 4016474027321256704, Gaia DR3 4016474027321256704, CBS 159, CSI+33-12114, GEN# +6.20020086

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Gaia DR2 Stilism Guo et al. 2015 Dreizler et al. 1996 Vincent et al. 2024 Simbad White Dwarf Catalog (McCook & Sion 1999)
Right ascension 12 13 56.14 (0.04) 12 13 56.14 (0.06) 12 13 56.14 12 13 56.26 (0.04) 12 13 56.35
Declination 32 56 31.84 (0.04) 32 56 31.83 (0.05) 32 56 31.84 32 56 31.36 (0.04) 32 56 37.32
Spectral type DO DO DO DO1 DO2
Effective temperature [K] 53000.0 88152.0 (5203)
log(g) [cgs] 7.80 8.05 (0.03)
Mass [M] 0.56 0.727 (0.02)
log(Luminosity) [L]
Cooling age [Gyr]
log(H/He) <-1.0
log(C/He) <-5
log(Ca/He)
log(Ca/H)
Parallax [mas] 6.26 (0.05) 6.32 (0.07) 6.26 6.26 (0.05)
Distance [pc] 159.64 (1) 158.23 (2) 159.64 159.64 (1)
Composition
Proper motion (right ascension) [mas/yr] -101.0218365 (0.05) -100.8830271 (0.1) -101.022 (0.05)
Proper motion (declination) [mas/yr] 30.2077009 (0.04) 30.1323002 (0.1) 30.208 (0.04)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 14.36
V magnitude 14.69
R magnitude 14.84
I magnitude 15.04
J magnitude 15.35 (0.05)
H magnitude 15.56 (0.1)
K magnitude 15.57 (0.2)
u magnitude 13.88 (0.02) 13.91
g magnitude 14.41 (0.02) 14.38
r magnitude 14.90 (0.01) 14.91
i magnitude 15.26 (0.02) 15.28
z magnitude 15.62 (0.01) 15.62
G magnitude 14.64 (0.003) 14.71 14.64 14.64 (0.003)
BP magnitude 14.45 (0.003)
RP magnitude 14.96 (0.002)
Pan g magnitude 14.44 (0.006)
Pan r magnitude 14.92 (0.007)
Pan i magnitude 15.30 (0.004)
Pan z magnitude 15.59 (0.003)
Pan y magnitude 15.79 (0.004)
E(B-V) 0.006

* 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.