All names: 2MASS J18312717+6434419, SDSS J183127.13+643441.8, HS 1831+6432, GALEX J183127.3+643442, FBS 1831+645, HS1831+6432, Gaia DR2 2256432438426909952, SDSS J183127.13+643441.9, Gaia DR3 2256432438426909952, FBS B 756, UCAC4 773-041967, TIC 233738050, KUV 18312+6432
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 18 31 27.21 | 18 31 27.14 (0.03) | ||
| Declination | 64 34 41.45 | 64 34 41.73 (0.03) | ||
| Spectral type | sdOB | sdB | ||
| Effective temperature | [K] | 36000.0 (900) | ||
| log(g) | [cgs] | 5.85 (0.1) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.70 (0.06) | 0.86 (0.03) | |
| Distance | [pc] | 1430.21 (123) | 1157.41 (42) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -5.516 (0.1) | -5.752 (0.04) | |
| Proper motion (declination) | [mas/yr] | 5.793 (0.1) | 5.739 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.97 (0.02) | |||
| V magnitude | 15.29 (0.01) | |||
| R magnitude | 15.76 (0.1) | |||
| I magnitude | ||||
| J magnitude | 15.97 (0.07) | 15.97 (0.07) | ||
| H magnitude | 16.20 (0.2) | 16.20 (0.2) | ||
| K magnitude | 16.24 | |||
| u magnitude | 14.83 (0.004) | 14.83 (0.004) | ||
| g magnitude | 15.12 (0.003) | 15.12 (0.003) | ||
| r magnitude | 15.60 (0.004) | 15.60 (0.004) | ||
| i magnitude | 15.94 (0.004) | 15.94 (0.004) | ||
| z magnitude | 16.26 (0.008) | 16.26 (0.008) | ||
| G magnitude | 15.35 (0.0009) | 15.34 (0.003) | ||
| BP magnitude | 15.13 (0.007) | |||
| RP magnitude | 15.61 (0.003) | |||
| Pan g magnitude | 15.17 (0.002) | |||
| Pan r magnitude | 15.61 (0.001) | |||
| Pan i magnitude | 15.96 (0.002) | |||
| Pan z magnitude | 16.22 (0.007) | |||
| Pan y magnitude | 16.39 (0.008) | |||
| E(B-V) | 0.038 | |||
* 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.