All names: GALEX J183129.6+085107, 2MASS J18312958+0851090, ATO J277.8732+08.8525, Gaia DR3 4479246445565795712, GALEXJ18314+0851, Gaia DR2 4479246445565795712, GALEX J183129.6+085108, UCAC4 495-086945
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 18 31 29.61 | 18 31 29.59 (0.04) | ||
| Declination | 08 51 09.48 | 08 51 09.23 (0.04) | ||
| Spectral type | sdO | sdO | ||
| Effective temperature | [K] | 62840.0 (4310) | ||
| log(g) | [cgs] | 6.27 (0.2) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.56 (0.09) | 0.94 (0.05) | |
| Distance | [pc] | 1793.72 (280) | 1061.57 (55) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -4.546 (0.1) | -4.6 (0.06) | |
| Proper motion (declination) | [mas/yr] | -5.253 (0.1) | -5.968 (0.05) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.48 (0.05) | |||
| V magnitude | 14.60 (0.01) | |||
| R magnitude | 14.69 (0.2) | |||
| I magnitude | ||||
| J magnitude | 14.15 (0.03) | 14.15 (0.03) | ||
| H magnitude | 13.82 (0.04) | 13.82 (0.04) | ||
| K magnitude | 13.72 (0.05) | 13.72 (0.05) | ||
| u magnitude | ||||
| g magnitude | 14.38 (0.04) | |||
| r magnitude | 14.75 (0.1) | |||
| i magnitude | 15.07 (0.2) | |||
| z magnitude | ||||
| G magnitude | 14.43 (0.01) | 14.48 (0.007) | ||
| BP magnitude | 14.30 (0.03) | |||
| RP magnitude | 14.37 (0.05) | |||
| Pan g magnitude | 14.35 (0.02) | |||
| Pan r magnitude | 14.79 (0.005) | |||
| Pan i magnitude | 14.66 (0.01) | |||
| Pan z magnitude | 14.80 (0.02) | |||
| Pan y magnitude | 15.19 (0.002) | |||
| E(B-V) | 0.290 | |||
* 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.