All names: Gaia DR3 4565805356705582976, Gaia EDR3 4565805356705582976, J1649+2238, SDSS J164939.22+223807.2, SDSS J164939.23+223807.2, Gaia DR2 4565805356705582976, SDSS J164939.23+223807.28
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR10 | Blouin 2020 | Coutu et al. 2019 | Gaia DR2 | Hollands et al. 2017 | Stilism | Kepler et al. 2015 | Simbad | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 49 39.23 (0.3) | 16 49 39.23 | 16 49 39.23 | 16 49 39.23 (0.5) | 16 49 39.23 (0.3) | |||||||
| Declination | 22 38 07.54 (0.4) | 22 38 07.27 | 22 38 07.30 | 22 38 07.53 (0.5) | 22 38 07.21 (0.4) | |||||||
| Spectral type | DZ | DZ | DZ | DZ | DZ | DZ | ||||||
| Effective temperature | [K] | 5261.0 (156) | 5180.0 (86) | 5332.0 (160) | 6029.0 (430) | |||||||
| log(g) | [cgs] | 8.10 (0.2) | 8.12 | 8.00 (0) | ||||||||
| Mass | [M☉] | 0.634 (0.1) | 0.6473 | |||||||||
| log(Luminosity) | [L☉] | |||||||||||
| Cooling age | [Gyr] | 5.9500 | 5.4000 | |||||||||
| log(H/He) | <-3.004 | -1.8 | ||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | -8.4 (0.2) | -9.088 (0.2) | -8.62 | -8.552999999999999 (0.05) | ||||||||
| log(Ca/H) | ||||||||||||
| log(N/He) | ||||||||||||
| log(O/He) | ||||||||||||
| log(Na/He) | -8.29 | |||||||||||
| log(Mg/He) | -6.7 (0.2) | -6.89 | ||||||||||
| 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) | -8.83 | |||||||||||
| log(Mn/He) | ||||||||||||
| log(Fe/He) | -7.4 (0.2) | -7.21 | ||||||||||
| log(Co/He) | ||||||||||||
| log(Ni/He) | ||||||||||||
| log(Cu/He) | ||||||||||||
| log(Zn/He) | ||||||||||||
| log(Ga/He) | ||||||||||||
| log(Ge/He) | ||||||||||||
| log(Sr/He) | ||||||||||||
| Parallax | [mas] | 7.18 (0.5) | 7.29 | 7.29 (0.8) | 7.18 (0.5) | |||||||
| Distance | [pc] | 139.24 (10) | 139.34 (16) | 137.12 (14) | 137.12 (14) | 147.00 (18) | 139.24 (10) | |||||
| Composition | He | He | He | He | ||||||||
| Proper motion (right ascension) | [mas/yr] | 7.024717798 (0.4) | 7.003214079 (1) | 7.025 (0.4) | ||||||||
| Proper motion (declination) | [mas/yr] | 20.19360491 (0.5) | 19.85233255 (1) | 20.194 (0.5) | ||||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | ||||||||||||
| B magnitude | ||||||||||||
| V magnitude | ||||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | ||||||||||||
| H magnitude | ||||||||||||
| K magnitude | ||||||||||||
| u magnitude | 23.62 (0.5) | 23.67 (0.5) | 23.67 (0.5) | 23.62 (0.5) | 23.62 (0.5) | |||||||
| g magnitude | 21.00 (0.03) | 21.00 (0.03) | 21.00 (0.03) | 21.00 (0.03) | 21.00 (0.03) | |||||||
| r magnitude | 20.35 (0.02) | 20.35 (0.02) | 20.35 (0.02) | 20.35 (0.02) | 20.35 (0.02) | |||||||
| i magnitude | 20.17 (0.03) | 20.14 (0.03) | 20.14 (0.03) | 20.17 (0.03) | 20.17 (0.03) | |||||||
| z magnitude | 20.16 (0.09) | 20.16 (0.09) | 20.16 (0.09) | 20.16 (0.09) | 20.16 (0.09) | |||||||
| G magnitude | 20.41 (0.07) | 20.46 | 20.41 (0.005) | |||||||||
| BP magnitude | 20.59 (0.07) | 20.61 | ||||||||||
| RP magnitude | 19.74 (0.05) | 19.85 | ||||||||||
| Pan g magnitude | 20.82 (0.03) | |||||||||||
| Pan r magnitude | 20.32 (0.03) | |||||||||||
| Pan i magnitude | 20.14 (0.01) | |||||||||||
| Pan z magnitude | 20.11 (0.02) | |||||||||||
| Pan y magnitude | 20.01 (0.2) | |||||||||||
| E(B-V) | 0.021 | |||||||||||
* 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.