All names: LSPM J2231+0906, SDSS J223101.11+090635.1, SDSS J223101.12+090635.2, J2231+0906, USNO-B1.0 0991-00602138, SDSS J223101.12+090635.17, Gaia DR3 2711092621203766912, Gaia EDR3 2711092621203766912, SDSS J223101.12+090635.1, Gaia DR2 2711092621203766912, WDJ223101.05+090636.80
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Kilic et al. 2025 | Caron et al. 2023 | Blouin 2020 | Coutu et al. 2019 | Gaia DR2 | Stilism | Hollands et al. 2017 | Kepler et al. 2016 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 22 31 01.17 (0.2) | 22 31 01.12 | 22 31 01.00 | 22 31 01.16 (0.4) | 22 31 01.17 | 22 31 01.05 (0.2) | 22 31 01.16 | |||||||||
| Declination | 09 06 33.75 (0.2) | 09 06 35.17 | 09 06 39.09 | 09 06 33.84 (0.3) | 09 06 33.75 | 09 06 36.79 (0.2) | 09 06 33.84 | |||||||||
| Spectral type | DZ | DZ | DZ | DZ | DZ | DZ | DZ | DZ | DZ | DZ | ||||||
| Effective temperature | [K] | 5672.0 (50) | 5626.0 (52) | 5679.0 (90) | 5726.0 (72) | 5900.0 (90) | 8093.0 (77) | 5888.0 (162) | ||||||||
| log(g) | [cgs] | 8.04 (0.03) | 8.00 (0.05) | 7.99 (0.08) | 8.05 | 8.00 (0) | 8.15 (0.06) | |||||||||
| Mass | [M☉] | 0.596 (0.03) | 0.571 (0.04) | 0.567 (0.05) | 0.5984 | 0.666 (0.05) | ||||||||||
| log(Luminosity) | [L☉] | |||||||||||||||
| Cooling age | [Gyr] | 3.7000 | 3.6500 | 3.5000 | ||||||||||||
| log(H/He) | -3.0 | -2.0 | <-3.0 | |||||||||||||
| log(C/He) | ||||||||||||||||
| log(Ca/He) | -10.01 | -9.96 | -9.9 (0.1) | -9.8405 (0.07) | -9.85 | -8.311 | ||||||||||
| log(Ca/H) | ||||||||||||||||
| log(N/He) | ||||||||||||||||
| log(O/He) | ||||||||||||||||
| log(Na/He) | ||||||||||||||||
| log(Mg/He) | -8.1 (0.5) | -9.24 | ||||||||||||||
| 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) | -9.0 (0.2) | -8.84 | ||||||||||||||
| log(Co/He) | ||||||||||||||||
| log(Ni/He) | ||||||||||||||||
| log(Cu/He) | ||||||||||||||||
| log(Zn/He) | ||||||||||||||||
| log(Ga/He) | ||||||||||||||||
| log(Ge/He) | ||||||||||||||||
| log(Sr/He) | ||||||||||||||||
| Parallax | [mas] | 11.28 (0.3) | 11.11 (0.5) | 11.11 | 11.11 (0.5) | 11.28 | 11.28 (0.3) | 11.11 (0.5) | ||||||||
| Distance | [pc] | 88.68 (2) | 90.01 (4) | 90.07 (4) | 89.99 (4) | 89.99 (4) | 93.00 (12) | 88.68 | 88.68 (2) | 89.99 (4) | ||||||
| Composition | He | He | He | He | He | |||||||||||
| Proper motion (right ascension) | [mas/yr] | 107.499 (0.3) | 107.1629337 (0.6) | 107.499 (0.3) | 107.163 | |||||||||||
| Proper motion (declination) | [mas/yr] | -190.342 (0.2) | -190.9442424 (0.5) | -190.342 (0.2) | -190.944 | |||||||||||
| Variability | ||||||||||||||||
| Magnetic | ||||||||||||||||
| Bd | [MG] | |||||||||||||||
| Infrared excess (disk) | ||||||||||||||||
| Binarity | ||||||||||||||||
| B magnitude | 19.40 | |||||||||||||||
| V magnitude | ||||||||||||||||
| R magnitude | 19.30 | |||||||||||||||
| I magnitude | ||||||||||||||||
| J magnitude | 18.19 (0.06) | |||||||||||||||
| H magnitude | ||||||||||||||||
| K magnitude | ||||||||||||||||
| u magnitude | 20.75 (0.09) | 20.75 (0.09) | 20.70 (0.09) | 20.70 (0.09) | 20.70 (0.09) | 20.74 (0.09) | 20.74 (0.09) | |||||||||
| g magnitude | 19.29 (0.01) | 19.29 (0.02) | 19.29 (0.02) | 19.29 (0.02) | 19.29 (0.01) | 19.29 (0.01) | ||||||||||
| r magnitude | 18.95 (0.01) | 18.94 (0.01) | 18.94 (0.01) | 18.94 (0.01) | 18.94 (0.01) | 18.94 (0.01) | ||||||||||
| i magnitude | 18.85 (0.01) | 18.84 (0.01) | 18.84 (0.01) | 18.84 (0.01) | 18.84 (0.01) | 18.84 (0.01) | ||||||||||
| z magnitude | 18.78 (0.04) | 18.78 (0.04) | 18.78 (0.04) | 18.78 (0.04) | 18.77 (0.04) | 18.77 (0.04) | ||||||||||
| G magnitude | 18.95 (0.004) | 18.97 | 18.95 | 18.95 (0.004) | 18.97 | |||||||||||
| BP magnitude | 19.19 (0.03) | 19.31 | 19.31 | |||||||||||||
| RP magnitude | 18.58 (0.03) | 18.55 | 18.55 | |||||||||||||
| Pan g magnitude | 19.22 (0.01) | 19.22 (0.01) | ||||||||||||||
| Pan r magnitude | 18.93 (0.006) | 18.93 (0.007) | ||||||||||||||
| Pan i magnitude | 18.86 (0.008) | 18.86 (0.008) | ||||||||||||||
| Pan z magnitude | 18.88 (0.02) | 18.88 (0.02) | ||||||||||||||
| Pan y magnitude | 18.97 (0.03) | 18.97 (0.02) | ||||||||||||||
| E(B-V) | 0.010 | |||||||||||||||
* 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.