SDSS J081716.39+200834.8

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

Special notes:

Spectra

Controls

Normalize at:
Normalize by mean flux

Range:

x: to
y: to

Spectra available:

Spectra without link are available upon request

Absorption lines

Photometric filters

BVRI
ugriz

Photometric fit





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.