All names: UCAC4 555-041199, SDSS J074023.56+204937.0, GALEX J074023.5+204938, Gaia EDR3 673058556816796288, SDSSJ074023.56+204937.0, Gaia DR2 673058556816796288, LAMOST J074023.56+204937.0, Gaia DR3 673058556816796288, 2MASS J07402356+2049371, TIC 70549283
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 07 40 23.56 (0.05) | 07 40 23.56 | 07 40 23.57 (0.05) | ||
| Declination | 20 49 37.08 (0.04) | 20 49 37.00 | 20 49 37.04 (0.04) | ||
| Spectral type | sdOB | sdB0.2He10 | |||
| Effective temperature | [K] | 33988.0 (916) | |||
| log(g) | [cgs] | 5.78 (0.1) | |||
| Mass | [M☉] | ||||
| log(Luminosity) | [L☉] | ||||
| Cooling age | [Gyr] | ||||
| log(H/He) | |||||
| log(C/He) | |||||
| log(Ca/He) | |||||
| log(Ca/H) | |||||
| Parallax | [mas] | 0.56 (0.05) | 0.57 (0.08) | 0.56 (0.05) | |
| Distance | [pc] | 1782.85 (168) | 1757.16 (246) | 1782.85 (168) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | -2.097 (0.06) | -1.981 (0.1) | -2.097 (0.06) | |
| Proper motion (declination) | [mas/yr] | 2.243 (0.06) | 1.873 (0.1) | 2.243 (0.06) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 15.39 (0.04) | ||||
| V magnitude | 15.55 (0.08) | ||||
| R magnitude | 15.87 (0.2) | ||||
| I magnitude | |||||
| J magnitude | 16.12 (0.09) | 16.12 (0.09) | |||
| H magnitude | 15.87 | ||||
| K magnitude | 16.26 | ||||
| u magnitude | 14.98 (0.004) | 14.98 (0.004) | |||
| g magnitude | 15.25 (0.003) | 15.33 (0.05) | |||
| r magnitude | 15.76 (0.004) | 15.81 (0.1) | |||
| i magnitude | 16.11 (0.004) | 16.11 (0.004) | |||
| z magnitude | 16.43 (0.008) | 16.43 (0.008) | |||
| G magnitude | 15.52 (0.003) | 15.54 (0.002) | 15.52 (0.003) | ||
| BP magnitude | 15.37 (0.005) | 15.28 (0.02) | |||
| RP magnitude | 15.81 (0.005) | 15.80 (0.004) | |||
| Pan g magnitude | 15.35 (0.004) | ||||
| Pan r magnitude | 15.78 (0.006) | ||||
| Pan i magnitude | 16.14 (0.003) | ||||
| Pan z magnitude | 16.44 (0.0006) | ||||
| Pan y magnitude | 16.63 (0.01) | ||||
| E(B-V) | 0.043 | ||||
* 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.