All names: SDSS J133818.00+602254.71, Gaia EDR3 1662717737342561280, Gaia DR2 1662717737342561280, SDSS J133818.00+602254.7, Gaia DR3 1662717737342561280, GALEX J133817.9+602254
| Parameter | Unit | Gaia EDR3 | SDSS DR12 | Genest-Beaulieu & Bergeron 2019 (spectroscopic) | Genest-Beaulieu & Bergeron 2019 (photometric) | Gaia DR2 | Stilism | Kepler et al. 2016 | Koester & Kepler 2015 | Vincent et al. 2024 | Simbad | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 13 38 18.00 (0.1) | 13 38 18.01 | 13 38 18.00 (0.1) | 13 38 18.00 | 13 38 17.99 (0.1) | |||||||
| Declination | 60 22 54.63 (0.09) | 60 22 54.71 | 60 22 54.63 (0.1) | 60 22 54.63 | 60 22 54.62 (0.09) | |||||||
| Spectral type | DB | DB | DB | DB+MS | ||||||||
| Effective temperature | [K] | 18559.0 | 18469.0 | 18136.0 (126) | 18232.0 (117) | 16144.0 (1179) | ||||||
| log(g) | [cgs] | 8.10 | 7.92 | 7.87 (0.04) | 7.95 (0.05) | 7.82 (0.1) | ||||||
| Mass | [M☉] | 0.657 | 0.552 | 0.522 (0.02) | 0.495 (0.08) | |||||||
| log(Luminosity) | [L☉] | |||||||||||
| Cooling age | [Gyr] | |||||||||||
| log(H/He) | <-5.726 | <-4.7 | ||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | <-5.19 | |||||||||||
| log(Ca/H) | ||||||||||||
| Parallax | [mas] | 3.25 (0.1) | 2.98 (0.1) | 3.25 | 3.25 (0.1) | |||||||
| Distance | [pc] | 307.55 (11) | 335.93 (16) | 318.00 | 307.55 | 307.55 (11) | ||||||
| Composition | ||||||||||||
| Proper motion (right ascension) | [mas/yr] | 7.104816602 (0.1) | 6.941089925 (0.2) | 7.105 (0.1) | ||||||||
| Proper motion (declination) | [mas/yr] | 0.717208304 (0.1) | 1.135572159 (0.2) | 0.717 (0.1) | ||||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | WDMS | |||||||||||
| B magnitude | ||||||||||||
| V magnitude | ||||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | ||||||||||||
| H magnitude | ||||||||||||
| K magnitude | ||||||||||||
| u magnitude | 18.16 (0.01) | 18.12 (0.01) | 18.14 (0.01) | |||||||||
| g magnitude | 18.14 (0.006) | 18.17 (0.02) | 18.14 (0.006) | |||||||||
| r magnitude | 18.49 (0.008) | 18.49 (0.01) | 18.48 (0.008) | |||||||||
| i magnitude | 18.81 (0.01) | 18.81 (0.02) | 18.81 (0.01) | |||||||||
| z magnitude | 19.12 (0.05) | 19.11 (0.07) | 19.11 (0.05) | |||||||||
| G magnitude | 18.33 (0.01) | 18.39 | 18.33 | 18.33 (0.003) | ||||||||
| BP magnitude | 18.27 (0.01) | 18.24 | ||||||||||
| RP magnitude | 18.30 (0.03) | 18.32 | ||||||||||
| Pan g magnitude | ||||||||||||
| Pan r magnitude | ||||||||||||
| Pan i magnitude | ||||||||||||
| Pan z magnitude | ||||||||||||
| Pan y magnitude | ||||||||||||
| E(B-V) | 0.017 | |||||||||||
* 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.