All names: Gaia EDR3 137138133963774208, Gaia DR2 137138133963774208, SDSS J025758.04+341748.1, SDSS J025758.04+341748.10, Gaia DR3 137138133963774208, SDSS J025758.04+341748.0, GALEX J025758.0+341748
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Genest-Beaulieu & Bergeron 2019 (spectroscopic) | Gaia DR2 | Simbad | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 02 57 58.05 (2) | 02 57 58.04 | 02 57 58.05 (2) | 02 57 58.05 (2) | 02 57 58.04 | ||||
| Declination | 34 17 48.12 (4) | 34 17 48.10 | 34 17 48.12 (2) | 34 17 48.12 (4) | 34 17 48.09 | ||||
| Spectral type | DB | DB | DB | ||||||
| Effective temperature | [K] | 31638.0 (4326) | 30274.0 | 30996.0 (2554) | |||||
| log(g) | [cgs] | 7.61 (0.5) | 7.65 | 7.64 (0.2) | |||||
| Mass | [M☉] | 0.44 (0.2) | 0.453 | 0.459 (0.09) | |||||
| log(Luminosity) | [L☉] | -0.57 (0.4) | |||||||
| Cooling age | [Gyr] | 0.0059 (0.004) | |||||||
| log(H/He) | <-3.316 | ||||||||
| 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] | ||||||||
| Distance | [pc] | ||||||||
| Composition | He | ||||||||
| Proper motion (right ascension) | [mas/yr] | ||||||||
| Proper motion (declination) | [mas/yr] | ||||||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 20.53 (0.06) | 20.54 (0.07) | 20.54 (0.07) | ||||||
| g magnitude | 20.61 (0.02) | 20.62 (0.03) | 20.62 (0.03) | ||||||
| r magnitude | 20.90 (0.05) | 20.88 (0.04) | 20.88 (0.04) | ||||||
| i magnitude | 21.17 (0.08) | 21.19 (0.08) | 21.19 (0.08) | ||||||
| z magnitude | 21.62 (0.4) | 21.59 (0.3) | 21.59 (0.3) | ||||||
| G magnitude | 20.74 (0.4) | 20.81 | 20.74 (0.02) | ||||||
| BP magnitude | 20.98 (0.4) | 21.18 | |||||||
| RP magnitude | 20.56 (0.06) | 20.74 | |||||||
| Pan g magnitude | 20.66 (0.04) | ||||||||
| Pan r magnitude | 20.86 (0.02) | ||||||||
| Pan i magnitude | 21.06 (0.05) | ||||||||
| Pan z magnitude | 21.17 (0.2) | ||||||||
| Pan y magnitude | |||||||||
| E(B-V) | |||||||||
* 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.