All names: EC 20464-3016, UCAC4 300-261878, WDJ204930.79-300502.86, Gaia DR2 6794613321399870080, Gaia DR3 6794613321399870080, Gaia EDR3 6794613321399870080, MCT 2046-3016, 2MASS J20493078-3005029, BPS CS 30336-0010
| Parameter | Unit | Gaia EDR3 | Bergeron et al. 2021 | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 |
|---|---|---|---|---|---|---|---|---|
| Right ascension | 20 49 30.79 (0.03) | 20 49 30.79 | 20 49 30.79 | 20 49 30.79 (0.03) | 20 49 30.79 | |||
| Declination | -30 05 04.36 (0.02) | -30 05 04.31 | -30 05 04.36 | -30 05 02.86 (0.02) | -30 05 04.31 | |||
| Spectral type | DBA | DB | DBA | |||||
| Effective temperature | [K] | 11277.0 (314) | 11872.0 (79) | |||||
| log(g) | [cgs] | 7.75 (0.2) | 8.09 (0.008) | |||||
| Mass | [M☉] | 0.448 (0.09) | 0.637 (0.007) | |||||
| log(Luminosity) | [L☉] | |||||||
| Cooling age | [Gyr] | 0.3357 | ||||||
| log(H/He) | -5.2 | |||||||
| log(C/He) | ||||||||
| 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] | 20.36 (0.04) | 20.36 (0.07) | 20.36 | 20.36 (0.04) | 20.36 (0.07) | ||
| Distance | [pc] | 49.11 (0.1) | 49.00 | 49.11 (0.2) | 49.11 | 49.11 (0.1) | 49.11 (0.2) | |
| Composition | He | |||||||
| Proper motion (right ascension) | [mas/yr] | -4.740115003 (0.04) | -4.717297769 (0.1) | -4.74 (0.04) | -4.717297769 | |||
| Proper motion (declination) | [mas/yr] | -93.23654188 (0.03) | -93.2660179 (0.06) | -93.237 (0.03) | -93.2660179 | |||
| Variability | ||||||||
| Magnetic | ||||||||
| Bd | [MG] | |||||||
| Infrared excess (disk) | ||||||||
| Binarity | ||||||||
| B magnitude | 15.47 (0.05) | |||||||
| V magnitude | 15.40 (0.02) | |||||||
| R magnitude | 15.55 (0.2) | |||||||
| I magnitude | ||||||||
| J magnitude | 15.63 (0.08) | |||||||
| H magnitude | 15.56 (0.1) | |||||||
| K magnitude | 15.49 (0.2) | |||||||
| u magnitude | ||||||||
| g magnitude | 15.43 (0.04) | |||||||
| r magnitude | 15.50 (0.09) | |||||||
| i magnitude | ||||||||
| z magnitude | ||||||||
| G magnitude | 15.39 (0.002) | 15.41 | 15.39 | 15.39 (0.003) | 15.41 | |||
| BP magnitude | 15.38 (0.002) | 15.34 | 15.34 | |||||
| RP magnitude | 15.39 (0.002) | 15.39 | 15.39 | |||||
| Pan g magnitude | ||||||||
| Pan r magnitude | ||||||||
| Pan i magnitude | ||||||||
| Pan z magnitude | ||||||||
| Pan y magnitude | ||||||||
| E(B-V) | 0.002 | |||||||
* 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.