All names: Gaia DR3 1646429950046252928, FBS 1540+681, WISEA J154038.23+675614.5, WD 1540+680, FBS B 839, GALEX J154038.2+675614, PG 1540+681, USNO-B1.0 1579-00188469, WISE J154038.26+675614.4, Gaia DR2 1646429950046252928, Gaia EDR3 1646429950046252928
| Parameter | Unit | Gaia EDR3 | Gaia DR2 | Stilism | Bergeron et al. 2011 | Beauchamp et al. 1999 | Vincent et al. 2024 | Simbad | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 15 40 38.10 (0.04) | 15 40 38.10 (0.06) | 15 40 38.10 | 15 40 38.21 (0.04) | 15 40 43.03 | ||||
| Declination | 67 56 14.42 (0.04) | 67 56 14.40 (0.05) | 67 56 14.42 | 67 56 13.85 (0.04) | 67 55 51.24 | ||||
| Spectral type | DB | DB | DB | DB3 | DB3 | ||||
| Effective temperature | [K] | 22140.0 (1246) | 22400.0 | 20110.0 (525) | |||||
| log(g) | [cgs] | 7.96 (0.07) | 7.91 | 7.97 (0.02) | |||||
| Mass | [M☉] | 0.58 (0.04) | 0.581 (0.02) | ||||||
| log(Luminosity) | [L☉] | -1.42 | |||||||
| Cooling age | [Gyr] | 0.0437 | |||||||
| log(H/He) | <-4.25 (0.6) | ||||||||
| 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] | 7.10 (0.04) | 7.22 (0.07) | 7.10 | 7.10 (0.04) | ||||
| Distance | [pc] | 140.94 (0.7) | 138.59 (1) | 139.00 | 140.94 | 140.94 (0.7) | |||
| Composition | He | He | |||||||
| Proper motion (right ascension) | [mas/yr] | -39.80246619 (0.04) | -39.77815916 (0.1) | -39.802 (0.04) | |||||
| Proper motion (declination) | [mas/yr] | 35.81743732 (0.04) | 35.5479494 (0.1) | 35.817 (0.04) | |||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 16.20 | ||||||||
| V magnitude | 16.19 | 16.44 (0.01) | |||||||
| R magnitude | 16.10 | ||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | |||||||||
| g magnitude | |||||||||
| r magnitude | |||||||||
| i magnitude | |||||||||
| z magnitude | |||||||||
| G magnitude | 16.36 (0.004) | 16.38 | 16.36 | 16.36 (0.003) | |||||
| BP magnitude | 16.27 (0.004) | 16.24 | |||||||
| RP magnitude | 16.51 (0.01) | 16.50 | |||||||
| Pan g magnitude | |||||||||
| Pan r magnitude | |||||||||
| Pan i magnitude | |||||||||
| Pan z magnitude | |||||||||
| Pan y magnitude | |||||||||
| E(B-V) | 0.013 | ||||||||
* 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.