All names: ULAS J084001.43+051528.8, SDSS J084001.43+051529.2, Gaia DR2 582509857257561472, ULAS J0840+05, J0840+0515, Gaia DR3 582509857257561472
| Parameter | Unit | Bergeron et al. 2022 | Stilism | Leggett et al. 2011 | Vincent et al. 2024 | Simbad |
|---|---|---|---|---|---|---|
| Right ascension | 08 40 01.39 | 08 40 01.44 (0.4) | ||||
| Declination | 05 15 27.59 | 05 15 29.58 (0.3) | ||||
| Spectral type | DC | DC | DA | DC | ||
| Effective temperature | [K] | 4756.0 (60) | 4350.0 (110) | 5073.0 (150) | ||
| log(g) | [cgs] | 7.94 (0.1) | ||||
| Mass | [M☉] | 0.582 (0.07) | 0.546 (0.09) | |||
| log(Luminosity) | [L☉] | |||||
| Cooling age | [Gyr] | 6.2880 | 7.5000 | |||
| log(H/He) | -1.1 | |||||
| log(C/He) | ||||||
| log(Ca/He) | ||||||
| log(Ca/H) | ||||||
| Parallax | [mas] | 9.05 | 9.05 (0.5) | |||
| Distance | [pc] | 82.00 (15) | 110.54 | 110.54 (6) | ||
| Composition | H+He | |||||
| Proper motion (right ascension) | [mas/yr] | -53.681 (0.5) | ||||
| Proper motion (declination) | [mas/yr] | -124.698 (0.4) | ||||
| Variability | ||||||
| Magnetic | ||||||
| Bd | [MG] | |||||
| Infrared excess (disk) | ||||||
| Binarity | ||||||
| B magnitude | ||||||
| V magnitude | ||||||
| R magnitude | ||||||
| I magnitude | ||||||
| J magnitude | 19.02 (0.08) | |||||
| H magnitude | 19.21 (0.2) | |||||
| K magnitude | ||||||
| u magnitude | 22.21 (0.3) | |||||
| g magnitude | 20.61 (0.03) | |||||
| r magnitude | 19.83 (0.02) | |||||
| i magnitude | 19.62 (0.03) | |||||
| z magnitude | 19.53 (0.09) | |||||
| G magnitude | 19.93 | 19.93 (0.005) | ||||
| BP magnitude | ||||||
| RP magnitude | ||||||
| Pan g magnitude | ||||||
| Pan r magnitude | ||||||
| Pan i magnitude | ||||||
| Pan z magnitude | ||||||
| Pan y magnitude | ||||||
| E(B-V) | 0.003 | |||||
* 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.