All names: SDSSJ173034.09+272139.8, Gaia DR3 4595141426447600512, SDSS J173034.09+272139.8, Gaia DR2 4595141426447600512, GALEX J173034.1+272139
| Parameter | Unit | Geier 2020 | Simbad |
|---|---|---|---|
| Right ascension | 17 30 34.09 | 17 30 34.09 (0.1) | |
| Declination | 27 21 39.80 | 27 21 39.87 (0.2) | |
| Spectral type | He-sdOB | sdOHe | |
| Effective temperature | [K] | 39500.0 (700) | |
| log(g) | [cgs] | 5.83 (0.2) | |
| Mass | [M☉] | ||
| log(Luminosity) | [L☉] | ||
| Cooling age | [Gyr] | ||
| log(H/He) | |||
| log(C/He) | |||
| log(Ca/He) | |||
| log(Ca/H) | |||
| Parallax | [mas] | -0.20 (0.2) | |
| Distance | [pc] | ||
| Composition | |||
| Proper motion (right ascension) | [mas/yr] | -0.571 (0.3) | -0.555 (0.2) |
| Proper motion (declination) | [mas/yr] | -6.343 (0.4) | -6.285 (0.2) |
| Variability | |||
| Magnetic | |||
| Bd | [MG] | ||
| Infrared excess (disk) | |||
| Binarity | |||
| B magnitude | |||
| V magnitude | |||
| R magnitude | |||
| I magnitude | |||
| J magnitude | |||
| H magnitude | |||
| K magnitude | |||
| u magnitude | 18.32 (0.01) | 18.32 (0.01) | |
| g magnitude | 18.62 (0.008) | 18.62 (0.008) | |
| r magnitude | 19.11 (0.01) | 19.11 (0.01) | |
| i magnitude | 19.45 (0.02) | 19.45 (0.02) | |
| z magnitude | 19.99 (0.1) | 19.99 (0.1) | |
| G magnitude | 18.91 (0.003) | 18.87 (0.003) | |
| BP magnitude | 18.63 (0.03) | ||
| RP magnitude | 19.15 (0.02) | ||
| Pan g magnitude | 18.71 (0.01) | ||
| Pan r magnitude | 19.11 (0.006) | ||
| Pan i magnitude | 19.47 (0.009) | ||
| Pan z magnitude | 19.79 (0.03) | ||
| Pan y magnitude | 19.62 (0.1) | ||
| E(B-V) | |||
* 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.