All names: Gaia EDR3 675590693439332096, Gaia DR3 675590693439332096, SDSS J081716.39+200834.9, GALEX J081716.3+200834, J0817+2008, WDJ081716.40+200835.04, Gaia DR2 675590693439332096, SDSS J081716.39+200834.8, WD 0814+202
Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Hardy et al. 2023a | Caron et al. 2023 | MWDD H | MWDD HE | Gaia DR2 | Stilism | Ferrario et al. 2015 | Kulebi et al. 2009 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Right ascension | 08 17 16.38 (0.1) | 08 17 16.39 | 08 17 16.38 (0.2) | 08 17 16.39 | 08 17 16.38 | 08 17 16.40 (0.1) | 08 17 16.38 | 08 17 16.15 | 08 17 16.39 | |||||||||
Declination | 20 08 34.75 (0.08) | 20 08 34.87 | 20 08 34.76 (0.09) | 20 08 34.80 | 20 08 34.75 | 20 08 35.04 (0.08) | 20 08 34.76 | 20 08 28.32 | 20 08 34.89 | |||||||||
Spectral type | DAH | DAH | DA | DAH | DA | DAH | DAH | DAH7.2 | DAH | DA | ||||||||
Effective temperature | [K] | 6988.9 (82) | 7273.0 (44) | 7156.0 | 6887.0 | 7000.0 | 7373.0 (128) | 6886.0 (43) | ||||||||||
log(g) | [cgs] | 8.30 (0.04) | 8.36 (0.02) | 8.32 | 8.21 | 8.00 (0) | 8.38 (0.03) | 9.99 (0.02) | ||||||||||
Mass | [M☉] | 0.7850381723418469 (0.05) | 0.822 (0.01) | 0.794 | 0.709 | 0.837 (0.03) | ||||||||||||
log(Luminosity) | [L☉] | |||||||||||||||||
Cooling age | [Gyr] | 2.9800 | 2.7430 | 2.5310 | ||||||||||||||
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] | 13.80 (0.1) | 13.71 (0.2) | 13.71 (0.2) | 13.80 | 13.80 (0.1) | 13.71 (0.2) | |||||||||||
Distance | [pc] | 72.46 (0.8) | 72.94 (1) | 72.96 (1) | 72.46 | 72.46 (0.8) | 72.96 (1) | |||||||||||
Composition | H | H | ||||||||||||||||
Proper motion (right ascension) | [mas/yr] | -21.1296242 (0.1) | -21.0019756 (0.3) | -21.13 (0.1) | -21.002 | |||||||||||||
Proper motion (declination) | [mas/yr] | -18.37854576 (0.1) | -18.26478799 (0.2) | -18.379 (0.1) | -18.265 | |||||||||||||
Variability | ||||||||||||||||||
Magnetic | yes | yes | yes | yes | ||||||||||||||
Bd | [MG] | 3.3285919845521903 | 3.37 (0.4) | 3.37 (0.4) | ||||||||||||||
Infrared excess (disk) | ||||||||||||||||||
Binarity | ||||||||||||||||||
B magnitude | ||||||||||||||||||
V magnitude | ||||||||||||||||||
R magnitude | ||||||||||||||||||
I magnitude | ||||||||||||||||||
J magnitude | 17.64 (0.04) | |||||||||||||||||
H magnitude | ||||||||||||||||||
K magnitude | ||||||||||||||||||
u magnitude | 18.91 (0.02) | 18.83 (0.02) | 18.91 (0.02) | 18.89 (0.02) | 18.91 | 18.89 (0.03) | ||||||||||||
g magnitude | 18.34 (0.007) | 18.34 (0.007) | 18.34 (0.007) | 18.34 | 18.35 (0.02) | |||||||||||||
r magnitude | 18.15 (0.007) | 18.15 (0.007) | 18.16 (0.007) | 18.15 | 18.13 (0.02) | |||||||||||||
i magnitude | 18.12 (0.008) | 18.12 (0.008) | 18.12 (0.009) | 18.12 | 18.12 (0.02) | |||||||||||||
z magnitude | 18.25 (0.02) | 18.25 (0.02) | 18.19 (0.03) | 18.23 | 18.23 (0.03) | |||||||||||||
G magnitude | 18.13 (0.02) | 18.17 | 18.13 | 18.13 (0.003) | 18.17 | |||||||||||||
BP magnitude | 18.30 (0.02) | 18.30 | 18.30 | |||||||||||||||
RP magnitude | 17.81 (0.02) | 17.79 | 17.79 | |||||||||||||||
Pan g magnitude | 18.30 (0.006) | 18.30 (0.006) | ||||||||||||||||
Pan r magnitude | 18.16 (0.01) | 18.16 (0.01) | ||||||||||||||||
Pan i magnitude | 18.13 (0.005) | 18.13 (0.004) | ||||||||||||||||
Pan z magnitude | 18.20 (0.005) | 18.20 (0.005) | ||||||||||||||||
Pan y magnitude | 18.23 (0.006) | 18.23 (0.006) | ||||||||||||||||
E(B-V) | 0.002 |
* 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.