All names: Gaia EDR3 4228068820974464256, SDSS J204023.28-000634.8, 2MASS J20402327-0006347, Gaia DR2 4228068820974464256, Gaia DR3 4228068820974464256, GALEX J204023.3-000634, SDSSJ204023.28-000634.8, SDSS J204023.28-000634.85, TIC 248139620
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Geier 2020 | Gaia DR2 | Stilism | Kepler et al. 2016 | Simbad |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 20 40 23.29 (0.03) | 20 40 23.29 | 20 40 23.28 | 20 40 23.29 (0.05) | 20 40 23.29 (0.03) | ||||
| Declination | -00 06 35.00 (0.02) | -00 06 34.86 | -00 06 34.85 | -00 06 34.99 (0.04) | -00 06 34.88 (0.02) | ||||
| Spectral type | sdB | sdB | sdB2.5He4 | ||||||
| Effective temperature | [K] | 24582.0 (1230) | 27063.0 (176) | ||||||
| log(g) | [cgs] | 5.27 (0.2) | 5.48 (0.03) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.61 (0.04) | 0.67 (0.06) | 0.67 (0.06) | 0.61 (0.04) | ||||
| Distance | [pc] | 1641.23 (111) | 1497.23 (131) | 1497.28 (131) | 1641.23 (111) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -1.425055796 (0.05) | -1.197 (0.1) | -1.196790131 (0.1) | -1.425 (0.05) | ||||
| Proper motion (declination) | [mas/yr] | -7.065873666 (0.03) | -6.921 (0.08) | -6.921306411 (0.08) | -7.066 (0.03) | ||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | 15.76 (0.06) | 15.76 (0.06) | |||||||
| H magnitude | 16.02 (0.2) | 15.91 (0.02) | |||||||
| K magnitude | 15.63 | 16.11 (0.03) | |||||||
| u magnitude | 15.05 (0.004) | 15.06 (0.004) | 15.07 (0.01) | 15.06 (0.004) | |||||
| g magnitude | 15.12 (0.004) | 15.11 (0.004) | 15.13 (0.007) | 15.11 (0.004) | |||||
| r magnitude | 15.55 (0.005) | 15.54 (0.005) | 15.54 (0.01) | 15.54 (0.005) | |||||
| i magnitude | 15.89 (0.005) | 15.87 (0.005) | 15.90 (0.008) | 15.87 (0.005) | |||||
| z magnitude | 16.17 (0.008) | 16.14 (0.008) | 16.15 (0.02) | 16.14 (0.008) | |||||
| G magnitude | 15.36 (0.002) | 15.37 (0.0005) | 15.37 | 15.36 (0.003) | |||||
| BP magnitude | 15.25 (0.002) | 15.20 (0.006) | 15.20 | ||||||
| RP magnitude | 15.57 (0.003) | 15.56 (0.003) | 15.56 | ||||||
| Pan g magnitude | 15.21 (0.005) | 15.21 (0.005) | |||||||
| Pan r magnitude | 15.58 (0.002) | 15.58 (0.002) | |||||||
| Pan i magnitude | 15.90 (0.002) | 15.90 (0.002) | |||||||
| Pan z magnitude | 16.16 (0.004) | 16.16 (0.004) | |||||||
| Pan y magnitude | 16.30 (0.007) | 16.30 (0.007) | |||||||
| E(B-V) | 0.050 | ||||||||
* 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.