All names: GSC 03518-00311, Gaia DR3 1363886900869046656, 2MASS J17402197+4853581, LAMOST J174021.97+485358.0, PG1739+489, TIC 298542142, PG 1739+489, Gaia DR2 1363886900869046656, V* V1099 Her
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 17 40 22.00 | 17 40 21.98 (0.03) | ||
| Declination | 48 53 58.35 | 48 53 58.04 (0.03) | ||
| Spectral type | sdB | sdB2VIIHe3 | ||
| Effective temperature | [K] | 27550.0 (290) | ||
| log(g) | [cgs] | 5.41 (0.03) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 1.49 (0.04) | 1.55 (0.03) | |
| Distance | [pc] | 671.10 (18) | 644.29 (13) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -6.132 (0.09) | -6.025 (0.04) | |
| Proper motion (declination) | [mas/yr] | -4.396 (0.09) | -4.292 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 12.96 | |||
| V magnitude | 13.20 | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 13.72 (0.03) | 13.72 (0.03) | ||
| H magnitude | 13.87 (0.05) | 13.87 (0.05) | ||
| K magnitude | 13.97 (0.06) | 13.97 (0.06) | ||
| u magnitude | 12.87 (0.003) | |||
| g magnitude | 13.06 (0.006) | |||
| r magnitude | 13.63 (0.008) | |||
| i magnitude | 13.80 (0.003) | |||
| z magnitude | 14.08 (0.004) | |||
| G magnitude | 13.19 (0.0008) | 13.18 (0.003) | ||
| BP magnitude | 13.00 (0.006) | |||
| RP magnitude | 13.43 (0.002) | |||
| Pan g magnitude | 13.02 | |||
| Pan r magnitude | 13.45 | |||
| Pan i magnitude | 13.78 (0.0002) | |||
| Pan z magnitude | 14.04 (0.004) | |||
| Pan y magnitude | 14.21 (0.002) | |||
| E(B-V) | 0.030 | |||
* 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.