All names: SDSS J140723.04+203918.5, SDSS J140723.04+203918.6, GALEX J140723.0+203918, J1407+2039, Gaia DR2 1247128489804218368, Gaia EDR3 1247128489804218368, WIRED J140723.04+203918.5, SDSS J140723.00+203918.4, Gaia DR3 1247128489804218368
| Parameter | Unit | Gaia EDR3 | SDSS DR12 | Coutu et al. 2019 | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 14 07 22.97 (0.1) | 14 07 23.04 | 14 07 23.07 | 14 07 22.97 (0.2) | 14 07 22.97 | 14 07 23.07 (0.1) | 14 07 23.04 | |||
| Declination | 20 39 18.55 (0.1) | 20 39 18.56 | 20 39 18.65 | 20 39 18.55 (0.3) | 20 39 18.55 | 20 39 18.65 (0.1) | 20 39 18.57 | |||
| Spectral type | DQ | DQ | DQ | DQ | DQ | |||||
| Effective temperature | [K] | 8387.0 (209) | 8546.0 (207) | 10112.0 (45) | ||||||
| log(g) | [cgs] | 7.73 | 7.89 (0.05) | 9.44 (0.4) | ||||||
| Mass | [M☉] | 0.4313 | 0.514 (0.04) | |||||||
| log(Luminosity) | [L☉] | |||||||||
| Cooling age | [Gyr] | 0.7040 | ||||||||
| log(H/He) | ||||||||||
| log(C/He) | -5.1097 (0.08) | |||||||||
| log(Ca/He) | ||||||||||
| log(Ca/H) | ||||||||||
| log(N/He) | ||||||||||
| log(O/He) | ||||||||||
| log(Na/He) | ||||||||||
| log(Mg/He) | ||||||||||
| log(Al/He) | ||||||||||
| log(Si/He) | ||||||||||
| log(P/He) | ||||||||||
| log(S/He) | ||||||||||
| log(Cl/He) | ||||||||||
| log(Sc/He) | ||||||||||
| log(Ti/He) | ||||||||||
| log(V/He) | ||||||||||
| log(Cr/He) | ||||||||||
| log(Mn/He) | ||||||||||
| log(Fe/He) | ||||||||||
| log(Co/He) | ||||||||||
| log(Ni/He) | ||||||||||
| log(Cu/He) | ||||||||||
| log(Zn/He) | ||||||||||
| log(Ga/He) | ||||||||||
| log(Ge/He) | ||||||||||
| log(Sr/He) | ||||||||||
| Parallax | [mas] | 6.76 (0.2) | 6.33 | 6.33 (0.3) | 6.76 | 6.76 (0.2) | ||||
| Distance | [pc] | 148.03 (4) | 157.88 (8) | 157.88 (8) | 148.03 | 148.03 (4) | ||||
| Composition | He | |||||||||
| Proper motion (right ascension) | [mas/yr] | -90.60242205 (0.2) | -91.02493962 (0.5) | -90.602 (0.2) | ||||||
| Proper motion (declination) | [mas/yr] | -6.466544766 (0.2) | -6.51107843 (0.5) | -6.467 (0.2) | ||||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | ||||||||||
| B magnitude | ||||||||||
| V magnitude | ||||||||||
| R magnitude | ||||||||||
| I magnitude | ||||||||||
| J magnitude | ||||||||||
| H magnitude | ||||||||||
| K magnitude | ||||||||||
| u magnitude | 18.81 (0.02) | 18.81 (0.02) | 18.88 (0.03) | |||||||
| g magnitude | 18.58 (0.007) | 18.58 (0.007) | 18.67 (0.03) | |||||||
| r magnitude | 18.57 (0.009) | 18.57 (0.009) | 18.65 (0.01) | |||||||
| i magnitude | 18.65 (0.01) | 18.65 (0.01) | 18.75 (0.02) | |||||||
| z magnitude | 18.82 (0.04) | 18.82 (0.04) | 18.92 (0.04) | |||||||
| G magnitude | 18.59 (0.02) | 18.64 | 18.59 | 18.59 (0.003) | ||||||
| BP magnitude | 18.63 (0.02) | 18.56 | ||||||||
| RP magnitude | 18.39 (0.02) | 18.35 | ||||||||
| Pan g magnitude | ||||||||||
| Pan r magnitude | ||||||||||
| Pan i magnitude | ||||||||||
| Pan z magnitude | ||||||||||
| Pan y magnitude | ||||||||||
| E(B-V) | 0.012 | |||||||||
* 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.