All names: Gaia DR2 671539749005618048, SDSS J074027.90+184819.9, GALEX J074027.9+184820, Gaia EDR3 671539749005618048, TIC 70547951, Gaia DR3 671539749005618048, 2MASS J07402789+1848199
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Gaia DR2 | Stilism | Simbad | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|
| Right ascension | 07 40 27.90 (0.2) | 07 40 27.90 | 07 40 27.90 (0.2) | 07 40 27.90 (0.2) | 07 40 27.90 | |||
| Declination | 18 48 19.80 (0.2) | 18 48 19.89 | 18 48 19.81 (0.2) | 18 48 19.85 (0.2) | 18 48 19.89 | |||
| Spectral type | DA+M | DA+M | ||||||
| Effective temperature | [K] | 6300.0 (3) | ||||||
| log(g) | [cgs] | 10.00 (0.003) | ||||||
| Mass | [M☉] | |||||||
| log(Luminosity) | [L☉] | |||||||
| Cooling age | [Gyr] | |||||||
| log(H/He) | ||||||||
| log(C/He) | ||||||||
| log(Ca/He) | ||||||||
| log(Ca/H) | ||||||||
| Parallax | [mas] | 0.98 (0.2) | -0.01 (0.3) | 0.98 (0.2) | ||||
| Distance | [pc] | 1018.52 (215) | 1018.54 (215) | |||||
| Composition | ||||||||
| Proper motion (right ascension) | [mas/yr] | 0.230836818 (0.2) | -0.322511195 (0.5) | 0.231 (0.2) | ||||
| Proper motion (declination) | [mas/yr] | -2.968048968 (0.2) | -2.889064294 (0.3) | -2.968 (0.2) | ||||
| Variability | ||||||||
| Magnetic | ||||||||
| Bd | [MG] | |||||||
| Infrared excess (disk) | ||||||||
| Binarity | WDMS | |||||||
| B magnitude | ||||||||
| V magnitude | ||||||||
| R magnitude | ||||||||
| I magnitude | ||||||||
| J magnitude | 16.13 (0.09) | |||||||
| H magnitude | 15.38 (0.1) | |||||||
| K magnitude | 15.18 (0.1) | |||||||
| u magnitude | 20.17 (0.05) | 20.16 (0.05) | 20.16 (0.05) | |||||
| g magnitude | 19.60 (0.01) | 19.56 (0.02) | 19.56 (0.02) | |||||
| r magnitude | 18.75 (0.009) | 18.75 (0.01) | 18.75 (0.01) | |||||
| i magnitude | 17.91 (0.008) | 17.89 (0.01) | 17.89 (0.01) | |||||
| z magnitude | 17.41 (0.01) | 17.41 (0.02) | 17.41 (0.02) | |||||
| G magnitude | 18.49 (0.03) | 18.52 | 18.49 (0.004) | |||||
| BP magnitude | 19.42 (0.03) | 19.35 | ||||||
| RP magnitude | 17.55 (0.01) | 17.52 | ||||||
| Pan g magnitude | 19.49 (0.01) | |||||||
| Pan r magnitude | 18.77 (0.004) | |||||||
| Pan i magnitude | 17.92 (0.006) | |||||||
| Pan z magnitude | 17.51 (0.004) | |||||||
| Pan y magnitude | 17.31 (0.008) | |||||||
| 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.