All names: SDSS J084334.40+225408.2, GALEX J084334.3+225408, Gaia DR2 665381831055188608, Gaia EDR3 665381831055188608, SDSS J084334.40+225408.20, Gaia DR3 665381831055188608, SDSS J084334.39+225408.2
Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Genest-Beaulieu & Bergeron 2019 (spectroscopic) | Genest-Beaulieu & Bergeron 2019 (photometric) | MWDD HE | Gaia DR2 | Stilism | Simbad | Kleinman et al. 2013 | Vincent et al. 2023 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Right ascension | 08 43 34.38 (0.4) | 08 43 34.39 | 08 43 34.38 (0.6) | 08 43 34.40 (0.4) | 08 43 34.40 | |||||||
Declination | 22 54 08.04 (0.2) | 22 54 08.26 | 22 54 08.05 (0.3) | 22 54 08.30 (0.2) | 22 54 08.20 | |||||||
Spectral type | DB | DB | DB | DB | ||||||||
Effective temperature | [K] | 18320.0 | 18721.0 | 14498.0 | 20878.0 (1237) | |||||||
log(g) | [cgs] | 8.01 | 7.04 | 6.75 | 8.29 (0.2) | |||||||
Mass | [M☉] | 0.599 | 0.249 | 0.188 | 0.77 (0.1) | |||||||
log(Luminosity) | [L☉] | |||||||||||
Cooling age | [Gyr] | |||||||||||
log(H/He) | -5.269 | |||||||||||
log(C/He) | ||||||||||||
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] | 1.58 (0.4) | 0.82 (0.6) | 1.58 (0.4) | ||||||||
Distance | [pc] | 631.93 (175) | 1226.40 (913) | 631.95 (175) | ||||||||
Composition | He | |||||||||||
Proper motion (right ascension) | [mas/yr] | -10.09416022 (0.5) | -11.16766895 (1) | -10.094 (0.5) | ||||||||
Proper motion (declination) | [mas/yr] | -16.02393732 (0.3) | -16.29615203 (0.7) | -16.024 (0.3) | ||||||||
Variability | ||||||||||||
Magnetic | ||||||||||||
Bd | [MG] | |||||||||||
Infrared excess (disk) | ||||||||||||
Binarity | ||||||||||||
B magnitude | ||||||||||||
V magnitude | ||||||||||||
R magnitude | ||||||||||||
I magnitude | ||||||||||||
J magnitude | ||||||||||||
H magnitude | ||||||||||||
K magnitude | ||||||||||||
u magnitude | 19.59 (0.03) | 19.59 (0.03) | 19.68 (0.03) | |||||||||
g magnitude | 19.72 (0.01) | 19.72 (0.01) | 19.72 (0.02) | |||||||||
r magnitude | 20.03 (0.02) | 20.03 (0.02) | 20.08 (0.02) | |||||||||
i magnitude | 20.20 (0.03) | 20.20 (0.03) | 20.33 (0.05) | |||||||||
z magnitude | 20.44 (0.1) | 20.44 (0.1) | 20.33 (0.1) | |||||||||
G magnitude | 19.87 (0.03) | 19.93 | 19.87 (0.004) | |||||||||
BP magnitude | 19.76 (0.03) | 19.77 | ||||||||||
RP magnitude | 19.99 (0.07) | 20.00 | ||||||||||
Pan g magnitude | 19.76 (0.01) | |||||||||||
Pan r magnitude | 20.05 (0.01) | |||||||||||
Pan i magnitude | 20.29 (0.02) | |||||||||||
Pan z magnitude | 20.48 (0.03) | |||||||||||
Pan y magnitude | 19.69 (0.2) | |||||||||||
E(B-V) | 0.028 |
* Constant surface field
Spectra without link are available upon request
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.