All names: Gaia DR2 679171768451282944, GALEX J082321.8+245141, SDSS J082321.79+245140.3, Gaia EDR3 679171772748207488, SDSS J082321.79+245140.4, WD 0820+250, Gaia DR3 679171772748207488
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Gaia DR2 | Stilism | Tremblay et al. 2011 | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 23 21.79 (0.1) | 08 23 21.79 | 08 23 21.79 (0.2) | 08 23 21.80 (0.1) | 08 23 21.79 | 08 23 22.06 | 08 23 21.79 | |||||
| Declination | 24 51 40.29 (0.09) | 24 51 40.42 | 24 51 40.29 (0.1) | 24 51 40.49 (0.09) | 24 51 40.43 | 24 51 36.36 | 24 51 40.43 | |||||
| Spectral type | DA | DA | DA | DA_auto | DA | DA | ||||||
| Effective temperature | [K] | 56115.0 (1524) | 60290.0 (3170) | 64368.0 (2384) | 61314.0 (2089) | |||||||
| log(g) | [cgs] | 7.30 (0.09) | 7.47 (0.2) | 7.48 (0.1) | 7.45 (0.1) | |||||||
| Mass | [M☉] | 0.43 (0.03) | 0.52 (0.05) | 0.521 (0.03) | ||||||||
| log(Luminosity) | [L☉] | 0.73 (0.08) | ||||||||||
| Cooling age | [Gyr] | 0.0001 | 0.0010 | |||||||||
| 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] | 0.84 (0.2) | 0.44 (0.3) | 0.84 (0.2) | ||||||||
| Distance | [pc] | 1189.92 (227) | 2249.15 (1496) | 1189.91 (227) | ||||||||
| Composition | H | H | ||||||||||
| Proper motion (right ascension) | [mas/yr] | -2.252383413 (0.1) | -3.224580062 (0.4) | -2.252 (0.1) | 1.5 | |||||||
| Proper motion (declination) | [mas/yr] | -12.39709214 (0.1) | -11.97426315 (0.2) | -12.397 (0.1) | -13.0 | |||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | ||||||||||||
| B magnitude | ||||||||||||
| V magnitude | ||||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | 18.76 (0.05) | |||||||||||
| H magnitude | 18.80 (0.2) | |||||||||||
| K magnitude | ||||||||||||
| u magnitude | 17.34 (0.009) | 17.35 (0.009) | 17.37 (0.02) | 17.37 | 17.35 (0.02) | |||||||
| g magnitude | 17.77 (0.005) | 17.77 (0.005) | 17.79 (0.02) | 17.79 | 17.79 (0.02) | |||||||
| r magnitude | 18.29 (0.008) | 18.29 (0.008) | 18.29 (0.01) | 18.29 | 18.29 (0.01) | |||||||
| i magnitude | 18.67 (0.01) | 18.67 (0.01) | 18.67 (0.02) | 18.66 | 18.67 (0.02) | |||||||
| z magnitude | 18.99 (0.04) | 18.98 (0.04) | 18.96 (0.04) | 18.95 | 18.98 (0.04) | |||||||
| G magnitude | 18.04 (0.01) | 18.06 | 18.04 (0.003) | |||||||||
| BP magnitude | 17.88 (0.01) | 17.78 | ||||||||||
| RP magnitude | 18.35 (0.04) | 18.40 | ||||||||||
| Pan g magnitude | 17.84 (0.004) | |||||||||||
| Pan r magnitude | 18.32 (0.006) | |||||||||||
| Pan i magnitude | 18.68 (0.005) | |||||||||||
| Pan z magnitude | 18.98 (0.02) | |||||||||||
| Pan y magnitude | 19.22 (0.03) | |||||||||||
| E(B-V) | 0.033 | |||||||||||
* 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.