All names: SDSS J093806.88+444647.9, SDSS J093806.87+444647.8, SDSS J093806.87+444647.9, WD 0934+450, Gaia DR3 821088792264944384, GALEX J093806.9+444647, Gaia DR2 821088792264944384, Gaia EDR3 821088792264944384
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Gaia DR2 | Stilism | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 09 38 06.87 (0.3) | 09 38 06.88 | 09 38 06.87 (0.6) | 09 38 06.88 (0.3) | 09 38 06.88 | 09 38 06.74 | 09 38 06.88 | |||||
| Declination | 44 46 47.86 (0.3) | 44 46 47.91 | 44 46 47.86 (0.6) | 44 46 47.93 (0.3) | 44 46 47.87 | 44 46 46.20 | 44 46 47.87 | |||||
| Spectral type | DA | DA | DA_auto | DA | DA | DA | ||||||
| Effective temperature | [K] | 41290.0 (3506) | 44211.0 (2831) | 43448.0 (2622) | ||||||||
| log(g) | [cgs] | 8.02 (0.4) | 7.67 (0.3) | 7.56 (0.3) | ||||||||
| Mass | [M☉] | 0.68 (0.2) | 0.5 (0.1) | |||||||||
| log(Luminosity) | [L☉] | -0.33 (0.3) | ||||||||||
| Cooling age | [Gyr] | 0.0033 (0.0008) | ||||||||||
| log(H/He) | ||||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | ||||||||||||
| log(Ca/H) | ||||||||||||
| log(C/H) | ||||||||||||
| log(N/H) | ||||||||||||
| log(O/H) | ||||||||||||
| log(Na/H) | ||||||||||||
| log(Mg/H) | ||||||||||||
| log(Al/H) | ||||||||||||
| log(Si/H) | ||||||||||||
| log(P/H) | ||||||||||||
| log(S/H) | ||||||||||||
| log(Sc/H) | ||||||||||||
| log(Ti/H) | ||||||||||||
| log(Cr/H) | ||||||||||||
| log(Mn/H) | ||||||||||||
| log(Fe/H) | ||||||||||||
| log(Ni/H) | ||||||||||||
| Parallax | [mas] | 0.96 (0.5) | 2.33 (1) | 0.96 (0.5) | ||||||||
| Distance | [pc] | 1039.28 (493) | 428.97 (175) | 1039.28 (493) | ||||||||
| Composition | H | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -5.906886474 (0.5) | -6.152407885 (1) | -5.907 (0.5) | 2.8 | |||||||
| Proper motion (declination) | [mas/yr] | -4.920455973 (0.4) | -5.115570678 (1) | -4.92 (0.4) | -20.0 | |||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | ||||||||||||
| B magnitude | ||||||||||||
| V magnitude | ||||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | ||||||||||||
| H magnitude | ||||||||||||
| K magnitude | ||||||||||||
| u magnitude | 19.45 (0.03) | 19.45 (0.03) | 19.48 (0.03) | 19.47 | 19.45 (0.03) | |||||||
| g magnitude | 19.80 (0.01) | 19.80 (0.01) | 19.84 (0.02) | 19.83 | 19.81 (0.02) | |||||||
| r magnitude | 20.32 (0.02) | 20.32 (0.02) | 20.33 (0.02) | 20.32 | 20.33 (0.02) | |||||||
| i magnitude | 20.62 (0.04) | 20.62 (0.04) | 20.61 (0.04) | 20.60 | 20.61 (0.04) | |||||||
| z magnitude | 21.01 (0.2) | 21.01 (0.2) | 21.01 (0.2) | 21.00 | 20.99 (0.2) | |||||||
| G magnitude | 20.03 (0.05) | 20.08 | 20.03 (0.005) | |||||||||
| BP magnitude | 19.93 (0.05) | 19.89 | ||||||||||
| RP magnitude | 20.18 (0.1) | 20.79 | ||||||||||
| Pan g magnitude | 19.85 (0.01) | |||||||||||
| Pan r magnitude | 20.31 (0.02) | |||||||||||
| Pan i magnitude | 20.67 (0.02) | |||||||||||
| Pan z magnitude | 21.06 (0.07) | |||||||||||
| Pan y magnitude | ||||||||||||
| E(B-V) | 0.019 | |||||||||||
* 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.