All names: SDSS J074855.84+304247.0, Gaia DR2 879237740307303040, UCAC2 42575759, ATO J117.2326+30.7130, 2MASS J07485584+3042471, Ton 287, Gaia DR3 879237740307303040, GALEX J074855.8+304249, Gaia EDR3 879237740307303040, LAMOST J074855.82+304247.0, GALEXJ07489+3042, UCAC4 604-042035, TIC 4491131
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Guo et al. 2015 | Simbad |
|---|---|---|---|---|---|---|
| Right ascension | 07 48 55.82 (0.03) | 07 48 55.84 | 07 48 55.84 (0.03) | |||
| Declination | 30 42 46.94 (0.02) | 30 42 49.42 | 30 42 47.04 (0.02) | |||
| Spectral type | sdB | DA? | sdBHe4 | |||
| Effective temperature | [K] | 30760.0 (830) | ||||
| log(g) | [cgs] | 5.71 (0.2) | ||||
| Mass | [M☉] | |||||
| log(Luminosity) | [L☉] | |||||
| Cooling age | [Gyr] | |||||
| log(H/He) | ||||||
| log(C/He) | ||||||
| log(Ca/He) | ||||||
| log(Ca/H) | ||||||
| Parallax | [mas] | 1.33 (0.03) | 1.33 (0.06) | 1.33 (0.03) | ||
| Distance | [pc] | 749.74 (18) | 749.85 (35) | 749.74 (18) | ||
| Composition | ||||||
| Proper motion (right ascension) | [mas/yr] | -18.33 (0.04) | -18.138 (0.1) | -18.33 (0.04) | ||
| Proper motion (declination) | [mas/yr] | -6.022 (0.02) | -5.829 (0.06) | -6.022 (0.02) | ||
| Variability | ||||||
| Magnetic | ||||||
| Bd | [MG] | |||||
| Infrared excess (disk) | ||||||
| Binarity | ||||||
| B magnitude | 13.95 (0.05) | |||||
| V magnitude | 14.14 (0.05) | |||||
| R magnitude | 14.21 (0.08) | |||||
| I magnitude | ||||||
| J magnitude | 14.56 (0.03) | 14.56 (0.03) | ||||
| H magnitude | 14.60 (0.05) | 14.60 (0.05) | ||||
| K magnitude | 14.65 (0.07) | 14.65 (0.07) | ||||
| u magnitude | 13.76 (0.004) | 13.76 (0.004) | ||||
| g magnitude | 14.03 (0.009) | 14.03 (0.009) | ||||
| r magnitude | 14.47 (0.009) | 14.47 (0.009) | ||||
| i magnitude | 14.69 (0.004) | 14.69 (0.004) | ||||
| z magnitude | 14.97 (0.005) | 14.97 (0.005) | ||||
| G magnitude | 14.05 (0.003) | 14.06 (0.002) | 14.05 (0.003) | |||
| BP magnitude | 13.93 (0.004) | 13.87 (0.006) | ||||
| RP magnitude | 14.27 (0.006) | 14.27 (0.005) | ||||
| Pan g magnitude | 13.88 (0.01) | |||||
| Pan r magnitude | 14.29 (0.005) | |||||
| Pan i magnitude | 14.62 (0.01) | |||||
| Pan z magnitude | 14.90 (0.007) | |||||
| Pan y magnitude | 14.99 (0.004) | |||||
| E(B-V) | 0.040 | |||||
* 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.