All names: SDSS J154022.80+535239.8, J1540+5352, Gaia EDR3 1597800784131612032, SDSS J154022.80+535239.89, Gaia DR2 1597800784131612032, SDSS J154022.79+535239.8, Gaia DR3 1597800784131612032
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Blouin 2020 | Coutu et al. 2019 | Hollands et al. 2017 | Stilism | Kepler et al. 2016 | Simbad |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 15 40 22.85 (2) | 15 40 22.80 | 15 40 22.84 | 15 40 22.85 (2) | ||||||
| Declination | 53 52 39.07 (3) | 53 52 39.57 | 53 52 39.10 | 53 52 39.07 (3) | ||||||
| Spectral type | DZ | DZ | DZ | DZ | DZ | |||||
| Effective temperature | [K] | 6500.0 (156) | 6486.0 (189) | 6520.0 (360) | 7160.0 (138) | |||||
| log(g) | [cgs] | 8.00 | 8.00 | 8.00 (0) | ||||||
| Mass | [M☉] | |||||||||
| log(Luminosity) | [L☉] | |||||||||
| Cooling age | [Gyr] | 0.0000 | 2.4000 | |||||||
| log(H/He) | <-3.3856 | |||||||||
| log(C/He) | ||||||||||
| log(Ca/He) | -8.7 (0.3) | -8.7102 (0.3) | -8.58 | -8.246 | ||||||
| log(Ca/H) | ||||||||||
| log(N/He) | ||||||||||
| log(O/He) | ||||||||||
| log(Na/He) | ||||||||||
| log(Mg/He) | -6.8 (0.1) | -7.07 | ||||||||
| 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) | -7.5 (0.3) | -7.47 | ||||||||
| log(Co/He) | ||||||||||
| log(Ni/He) | ||||||||||
| log(Cu/He) | ||||||||||
| log(Zn/He) | ||||||||||
| log(Ga/He) | ||||||||||
| log(Ge/He) | ||||||||||
| log(Sr/He) | ||||||||||
| Parallax | [mas] | |||||||||
| Distance | [pc] | 296.12 (16) | 294.00 (40) | |||||||
| Composition | He | He | He | He | ||||||
| Proper motion (right ascension) | [mas/yr] | |||||||||
| Proper motion (declination) | [mas/yr] | |||||||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | ||||||||||
| B magnitude | ||||||||||
| V magnitude | ||||||||||
| R magnitude | ||||||||||
| I magnitude | ||||||||||
| J magnitude | ||||||||||
| H magnitude | ||||||||||
| K magnitude | ||||||||||
| u magnitude | 22.91 (0.3) | 22.89 (0.3) | 22.89 (0.3) | 22.89 (0.3) | 22.89 (0.3) | |||||
| g magnitude | 21.16 (0.03) | 21.16 (0.04) | 21.16 (0.04) | 21.16 (0.04) | 21.16 (0.04) | |||||
| r magnitude | 20.95 (0.04) | 20.95 (0.04) | 20.95 (0.04) | 20.95 (0.04) | 20.95 (0.04) | |||||
| i magnitude | 20.99 (0.05) | 20.99 (0.05) | 20.99 (0.05) | 20.99 (0.05) | 20.99 (0.05) | |||||
| z magnitude | 21.30 (0.3) | 21.25 (0.2) | 21.25 (0.2) | 21.25 (0.2) | 21.25 (0.2) | |||||
| G magnitude | 20.96 (0.2) | 20.96 (0.02) | ||||||||
| BP magnitude | 20.86 (0.2) | |||||||||
| RP magnitude | 20.10 (0.2) | |||||||||
| Pan g magnitude | 21.11 (0.07) | |||||||||
| Pan r magnitude | 20.83 (0.03) | |||||||||
| Pan i magnitude | 21.02 (0.05) | |||||||||
| Pan z magnitude | 21.09 (0.04) | |||||||||
| 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.