All names: 2MASS J08182042+2705328, SDSS J081820.42+270532.6, WIRED J081820.41+270532.6, SDSS J081820.41+270532.6, Gaia DR2 683169012910602496, SDSS J081820.42+270532.7, Gaia DR3 683169012910602496, Gaia EDR3 683169012910602496, TIC 155231107, WD 0815+272, Ton 309
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Gaia DR2 | Stilism | Tremblay et al. 2011 | Vincent et al. 2024 | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 18 20.43 (0.04) | 08 18 20.42 | 08 18 20.43 (0.05) | 08 18 20.43 | 08 18 20.42 (0.04) | 08 18 20.42 | 08 18 20.11 | 08 18 20.42 | ||||||
| Declination | 27 05 32.65 (0.04) | 27 05 32.67 | 27 05 32.65 (0.04) | 27 05 32.65 | 27 05 32.66 (0.04) | 27 05 32.67 | 27 05 30.84 | 27 05 32.67 | ||||||
| Spectral type | DA | DA | DA | DA | DA | DA | DA | DA | ||||||
| Effective temperature | [K] | 81046.0 (1753) | 86620.0 (1990) | 148316.0 (23742) | 89362.0 (2060) | 79873.0 (1646) | ||||||||
| log(g) | [cgs] | 7.39 (0.05) | 7.32 (0.06) | 8.40 (0.5) | 7.60 (0.08) | 7.41 (0.06) | ||||||||
| Mass | [M☉] | 0.54 (0.02) | 0.56 (0.01) | 2.964 (2) | 0.559 (0.01) | |||||||||
| log(Luminosity) | [L☉] | 1.38 (0.06) | ||||||||||||
| Cooling age | [Gyr] | 0.0001 | 0.0002 | |||||||||||
| 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] | 3.03 (0.06) | 3.00 (0.07) | 3.03 | 3.03 (0.06) | |||||||||
| Distance | [pc] | 329.61 (6) | 333.53 (7) | 329.61 | 329.61 (6) | |||||||||
| Composition | H | H | ||||||||||||
| Proper motion (right ascension) | [mas/yr] | 10.45669055 (0.05) | 10.17526909 (0.1) | 10.457 (0.06) | -1.1 | |||||||||
| Proper motion (declination) | [mas/yr] | -0.971002115 (0.04) | -1.063574029 (0.08) | -0.971 (0.04) | 1.8 | |||||||||
| Variability | ||||||||||||||
| Magnetic | ||||||||||||||
| Bd | [MG] | |||||||||||||
| Infrared excess (disk) | ||||||||||||||
| Binarity | ||||||||||||||
| B magnitude | 14.80 | |||||||||||||
| V magnitude | ||||||||||||||
| R magnitude | ||||||||||||||
| I magnitude | ||||||||||||||
| J magnitude | 16.05 (0.01) | |||||||||||||
| H magnitude | 16.23 (0.03) | |||||||||||||
| K magnitude | 16.39 (0.05) | |||||||||||||
| u magnitude | 14.42 (0.003) | 14.42 (0.003) | 14.46 (0.01) | 14.45 | 14.44 (0.01) | |||||||||
| g magnitude | 14.91 (0.003) | 14.91 (0.003) | 14.97 (0.02) | 14.97 | 14.94 (0.02) | |||||||||
| r magnitude | 15.49 (0.003) | 15.49 (0.003) | 15.50 (0.01) | 15.49 | 15.49 (0.01) | |||||||||
| i magnitude | 15.87 (0.004) | 15.87 (0.004) | 15.88 (0.01) | 15.88 | 15.87 (0.01) | |||||||||
| z magnitude | 16.21 (0.007) | 16.21 (0.007) | 16.23 (0.01) | 16.22 | 16.20 (0.01) | |||||||||
| G magnitude | 15.21 (0.002) | 15.22 | 15.21 | 15.21 (0.003) | ||||||||||
| BP magnitude | 15.02 (0.002) | 14.94 | ||||||||||||
| RP magnitude | 15.57 (0.004) | 15.55 | ||||||||||||
| Pan g magnitude | 15.00 (0.004) | |||||||||||||
| Pan r magnitude | 15.50 (0.002) | |||||||||||||
| Pan i magnitude | 15.91 (0.003) | |||||||||||||
| Pan z magnitude | 16.21 (0.002) | |||||||||||||
| Pan y magnitude | 16.41 (0.01) | |||||||||||||
| E(B-V) | 0.017 | |||||||||||||
* 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.