All names: TIC 291311707, WISEA J163904.59+082300.9, Gaia DR2 4445392207648135680, PG1636+085, Gaia DR3 4445392207648135680, PG 1636+085, UCAC4 492-065399, SDSS J163904.59+082301.0, 2MASS J16390459+0823009, LAMOST J163904.59+082300.5, GALEX J163904.6+082300, WISE J163904.59+082301.1
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 16 39 04.60 | 16 39 04.60 (0.05) | ||
| Declination | 08 23 01.56 | 08 23 01.08 (0.04) | ||
| Spectral type | sdB | sdB | ||
| Effective temperature | [K] | |||
| log(g) | [cgs] | |||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.49 (0.09) | 0.45 (0.07) | |
| Distance | [pc] | 2032.11 (371) | 2242.66 (332) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -4.451 (0.1) | -3.953 (0.07) | |
| Proper motion (declination) | [mas/yr] | -6.998 (0.1) | -6.793 (0.07) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 16.27 (0.06) | |||
| V magnitude | 16.13 (0.01) | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 15.69 (0.06) | 15.69 (0.06) | ||
| H magnitude | 15.38 (0.09) | 15.38 (0.09) | ||
| K magnitude | 15.63 (0.2) | 15.63 (0.2) | ||
| u magnitude | 16.05 (0.006) | |||
| g magnitude | 16.12 (0.004) | |||
| r magnitude | 16.37 (0.004) | |||
| i magnitude | 16.50 (0.005) | |||
| z magnitude | 16.59 (0.01) | |||
| G magnitude | 16.22 (0.001) | 16.21 (0.003) | ||
| BP magnitude | 16.13 (0.009) | |||
| RP magnitude | 16.17 (0.004) | |||
| Pan g magnitude | 16.15 (0.005) | |||
| Pan r magnitude | 16.38 (0.004) | |||
| Pan i magnitude | 16.53 (0.003) | |||
| Pan z magnitude | 16.61 (0.003) | |||
| Pan y magnitude | 16.65 (0.007) | |||
| E(B-V) | 0.060 | |||
* 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.