All names: SDSS J083038.79+470247.0, Gaia EDR3 918582488300008960, TIC 27321037, 2MASS J08303881+4702468, SDSS J083038.80+470247.0, WIRED J083038.79+470247.0, SDSS J083038.80+470246.9, [HHD2009] SDSS J0830+4702, Gaia DR2 918582488300008960, SDSS J083038.79+470246.9, WD 0827+472, GALEX J083038.8+470247, Gaia DR3 918582488300008960
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Gaia DR2 | Stilism | sdss-wdms.org (29/04/2016) | Tremblay et al. 2011 | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 30 38.79 (0.1) | 08 30 38.80 | 08 30 38.79 (0.2) | 08 30 38.79 | 08 30 38.80 (0.1) | 08 30 38.80 | 08 30 38.04 | 08 30 38.79 | |||||
| Declination | 47 02 46.98 (0.09) | 47 02 46.98 | 47 02 46.98 (0.1) | 47 02 47.00 | 47 02 46.94 (0.09) | 47 02 47.00 | 47 02 42.00 | 47 02 47.04 | |||||
| Spectral type | DA+M | DA+M | DA | DA+dMe | DA+M | DA+M | DA+M | ||||||
| Effective temperature | [K] | 39127.0 (1333) | 42648.0 (1430) | 47230.0 (2650) | 6644.0 (44) | 6300.0 (3) | |||||||
| log(g) | [cgs] | 7.94 (0.2) | 7.80 (0.1) | 7.51 (0.2) | 8.47 (0.1) | 10.00 (0.003) | |||||||
| Mass | [M☉] | 0.63 (0.08) | 0.583 (0.07) | 0.49 (0.07) | |||||||||
| log(Luminosity) | [L☉] | -0.37 (0.1) | |||||||||||
| Cooling age | [Gyr] | 0.0039 (0.0003) | 0.0023 | ||||||||||
| log(H/He) | |||||||||||||
| log(C/He) | |||||||||||||
| log(Ca/He) | |||||||||||||
| log(Ca/H) | |||||||||||||
| log(C/H) | |||||||||||||
| log(N/H) | |||||||||||||
| log(O/H) | |||||||||||||
| log(Na/H) | |||||||||||||
| log(Mg/H) | |||||||||||||
| log(Al/H) | |||||||||||||
| log(Si/H) | |||||||||||||
| log(P/H) | |||||||||||||
| log(S/H) | |||||||||||||
| log(Sc/H) | |||||||||||||
| log(Ti/H) | |||||||||||||
| log(Cr/H) | |||||||||||||
| log(Mn/H) | |||||||||||||
| log(Fe/H) | |||||||||||||
| log(Ni/H) | |||||||||||||
| Parallax | [mas] | 0.79 (0.2) | 0.54 (0.2) | 0.79 (0.2) | |||||||||
| Distance | [pc] | 1264.86 (258) | 1851.78 (698) | 1010.00 (193) | 1264.86 (258) | ||||||||
| Composition | H | H | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -4.819743907 (0.1) | -5.254132521 (0.3) | -4.82 (0.1) | 0.1 | ||||||||
| Proper motion (declination) | [mas/yr] | 2.686907025 (0.1) | 2.402320658 (0.2) | 2.687 (0.1) | 4.4 | ||||||||
| Variability | |||||||||||||
| Magnetic | |||||||||||||
| Bd | [MG] | ||||||||||||
| Infrared excess (disk) | |||||||||||||
| Binarity | WDMS | WDMS | yes | WDMS | |||||||||
| B magnitude | |||||||||||||
| V magnitude | |||||||||||||
| R magnitude | |||||||||||||
| I magnitude | |||||||||||||
| J magnitude | 15.96 (0.08) | ||||||||||||
| H magnitude | 15.36 (0.1) | ||||||||||||
| K magnitude | 15.25 (0.1) | ||||||||||||
| u magnitude | 18.34 (0.01) | 18.35 | 18.35 (0.01) | 18.35 (0.01) | 18.32 | 18.35 (0.02) | |||||||
| g magnitude | 18.47 (0.007) | 18.50 | 18.47 (0.007) | 18.50 (0.02) | 18.48 | 18.50 (0.02) | |||||||
| r magnitude | 18.15 (0.007) | 18.16 | 18.15 (0.007) | 18.16 (0.02) | 18.17 | 18.16 (0.02) | |||||||
| i magnitude | 17.66 (0.007) | 17.67 | 17.67 (0.007) | 17.67 (0.01) | 17.67 | 17.67 (0.01) | |||||||
| z magnitude | 17.37 (0.01) | 17.38 | 17.37 (0.01) | 17.38 (0.02) | 17.38 | 17.37 (0.02) | |||||||
| G magnitude | 17.96 (0.02) | 17.97 | 17.96 (0.003) | ||||||||||
| BP magnitude | 18.35 (0.02) | 18.33 | |||||||||||
| RP magnitude | 17.31 (0.009) | 17.32 | |||||||||||
| Pan g magnitude | 18.43 (0.007) | ||||||||||||
| Pan r magnitude | 18.15 (0.006) | ||||||||||||
| Pan i magnitude | 17.70 (0.006) | ||||||||||||
| Pan z magnitude | 17.42 (0.02) | ||||||||||||
| Pan y magnitude | 17.26 (0.02) | ||||||||||||
| E(B-V) | 0.026 | ||||||||||||
* 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.