All names: Gaia EDR3 677445741354224512, Gaia DR2 677445741354224512, USNO-B1.0 1131-00185289, SDSS J081544.25+230904.75, GALEX J081544.2+230906, Gaia DR3 677445741354224512, J0815+2309, EQ J0815+2309, SDSS J081544.24+230904.9, SDSS J081544.25+230904.7
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | SDSS DR10 | Gaia DR2 | Stilism | Kepler et al. 2015 | Gianninas et al. 2014 | Simbad |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 15 44.26 (0.1) | 08 15 44.24 | 08 15 44.24 | 08 15 44.26 (0.2) | 08 15 44.24 (0.1) | |||||
| Declination | 23 09 04.55 (0.08) | 23 09 04.92 | 23 09 04.92 | 23 09 04.57 (0.1) | 23 09 05.06 (0.08) | |||||
| Spectral type | DA_known | DA | sdB | |||||||
| Effective temperature | [K] | 21915.0 (330) | 21430.0 (330) | |||||||
| log(g) | [cgs] | 5.70 (0.05) | 5.84 (0.05) | |||||||
| Mass | [M☉] | 0.178 (0.05) | 0.207 | |||||||
| log(Luminosity) | [L☉] | |||||||||
| Cooling age | [Gyr] | 0.3800 (0.2) | ||||||||
| log(H/He) | ||||||||||
| log(C/He) | ||||||||||
| log(Ca/He) | ||||||||||
| log(Ca/H) | -5.27 | |||||||||
| 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] | 0.47 (0.1) | 0.51 (0.2) | 0.47 (0.1) | ||||||
| Distance | [pc] | 2117.26 (568) | 1964.20 (779) | 2025.00 (234) | 2117.30 (568) | |||||
| Composition | H | |||||||||
| Proper motion (right ascension) | [mas/yr] | 13.0279281 (0.1) | 13.0083912 (0.3) | 13.028 (0.1) | ||||||
| Proper motion (declination) | [mas/yr] | -31.48649764 (0.09) | -31.66700855 (0.2) | -31.486 (0.09) | ||||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | WDMS | |||||||||
| B magnitude | 18.70 | |||||||||
| V magnitude | ||||||||||
| R magnitude | 18.60 | |||||||||
| I magnitude | ||||||||||
| J magnitude | 18.43 (0.04) | |||||||||
| H magnitude | 18.30 (0.1) | |||||||||
| K magnitude | ||||||||||
| u magnitude | 17.95 (0.01) | 17.95 (0.01) | 17.97 (0.02) | 17.95 (0.01) | ||||||
| g magnitude | 17.80 (0.005) | 17.80 (0.005) | 17.80 (0.02) | 17.80 (0.005) | ||||||
| r magnitude | 18.21 (0.007) | 18.21 (0.007) | 18.22 (0.02) | 18.21 (0.007) | ||||||
| i magnitude | 18.46 (0.01) | 18.46 (0.01) | 18.48 (0.01) | 18.46 (0.01) | ||||||
| z magnitude | 18.75 (0.03) | 18.75 (0.03) | 18.76 (0.03) | 18.75 (0.03) | ||||||
| G magnitude | 18.02 (0.02) | 18.05 | 18.02 (0.003) | |||||||
| BP magnitude | 17.93 (0.02) | 17.87 | ||||||||
| RP magnitude | 18.22 (0.03) | 18.15 | ||||||||
| Pan g magnitude | 17.86 (0.003) | |||||||||
| Pan r magnitude | 18.21 (0.003) | |||||||||
| Pan i magnitude | 18.51 (0.006) | |||||||||
| Pan z magnitude | 18.75 (0.02) | |||||||||
| Pan y magnitude | 18.89 (0.02) | |||||||||
| E(B-V) | 0.035 | |||||||||
* 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.