WD 1720+638
All names: GALEX J172045.0+635031, SDSS J172045.10+635031.8, SDSS J172045.10+635031.9, [MMN2004c] WD J1720+6350, SDSS J172045.09+635031.8, WD 1720+638, Gaia DR2 1632579127193237120, Gaia DR3 1632579127193237120, SDSS J172045.09+635031.7, SDSS J172045.09+635031.9, WIRED J172045.09+635031.8, Gaia EDR3 1632579127193237120
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | MWDD H | Gaia DR2 | Stilism | sdss-wdms.org (29/04/2016) | Tremblay et al. 2011 | Mukadam et al. 2004 | Vincent et al. 2024 | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 17 20 45.09 (0.1) | 17 20 45.10 | 17 20 45.09 (0.2) | 17 20 45.09 | 17 20 45.09 | 17 20 45.10 (0.1) | 17 20 45.10 | 17 20 44.64 | 17 20 45.09 | |||||||
| Declination | 63 50 32.19 (0.1) | 63 50 31.93 | 63 50 32.18 (0.2) | 63 50 31.70 | 63 50 32.19 | 63 50 31.76 (0.1) | 63 50 31.83 | 63 50 26.52 | 63 50 31.77 | |||||||
| Spectral type | DA+M | DA+M | DA | DA | DA+M | DA+M | DA+M | DA+M | DA+MS | |||||||
| Effective temperature | [K] | 9906.0 | 15610.0 (444) | 12070.0 (300) | 11690.0 (170) | 8637.0 (255) | 11694.0 (171) | 11413.0 (152) | ||||||||
| log(g) | [cgs] | 7.27 | 7.73 (0.1) | 8.21 (0.1) | 8.08 (0.09) | 6.84 (0.08) | 8.08 (0.09) | 8.34 (0.09) | ||||||||
| Mass | [M☉] | 0.28 | 0.47 (0.05) | 0.73 (0.06) | 0.178 (0.02) | |||||||||||
| log(Luminosity) | [L☉] | |||||||||||||||
| Cooling age | [Gyr] | 0.3056 | 0.5370 | |||||||||||||
| 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] | 3.07 (0.1) | 3.16 (0.2) | 3.07 | 3.07 (0.1) | |||||||||||
| Distance | [pc] | 325.46 (15) | 316.37 (19) | 588.00 (49) | 325.46 | 325.46 (15) | ||||||||||
| Composition | H | H | ||||||||||||||
| Proper motion (right ascension) | [mas/yr] | -3.484663934 (0.2) | -3.67479305 (0.4) | -3.485 (0.2) | -2.2 | |||||||||||
| Proper motion (declination) | [mas/yr] | 26.90622502 (0.2) | 26.92558783 (0.4) | 26.906 (0.2) | 20.8 | |||||||||||
| Variability | NOV | |||||||||||||||
| Magnetic | ||||||||||||||||
| Bd | [MG] | |||||||||||||||
| Infrared excess (disk) | ||||||||||||||||
| Binarity | WDMS | WDMS | yes | WDMS | WDMS | |||||||||||
| B magnitude | ||||||||||||||||
| V magnitude | ||||||||||||||||
| R magnitude | ||||||||||||||||
| I magnitude | ||||||||||||||||
| J magnitude | ||||||||||||||||
| H magnitude | ||||||||||||||||
| K magnitude | ||||||||||||||||
| u magnitude | 18.83 (0.02) | 18.90 | 18.83 (0.02) | 18.91 (0.03) | 18.91 | 18.90 (0.03) | ||||||||||
| g magnitude | 18.57 (0.008) | 18.62 | 18.63 | 18.57 (0.008) | 18.62 (0.02) | 18.63 | 18.62 (0.02) | |||||||||
| r magnitude | 18.84 (0.01) | 18.84 | 18.84 (0.01) | 18.84 (0.02) | 18.84 | 18.83 (0.02) | ||||||||||
| i magnitude | 18.84 (0.01) | 18.88 | 18.84 (0.01) | 18.88 (0.02) | 18.88 | 18.89 (0.02) | ||||||||||
| z magnitude | 18.56 (0.03) | 18.55 | 18.56 (0.03) | 18.55 (0.05) | 18.56 | 18.54 (0.05) | ||||||||||
| G magnitude | 18.63 (0.03) | 18.66 | 18.63 | 18.63 (0.004) | ||||||||||||
| BP magnitude | 18.73 (0.03) | 18.65 | ||||||||||||||
| RP magnitude | 18.48 (0.03) | 18.46 | ||||||||||||||
| Pan g magnitude | 18.61 (0.006) | |||||||||||||||
| Pan r magnitude | 18.85 (0.008) | |||||||||||||||
| Pan i magnitude | 18.86 (0.007) | |||||||||||||||
| Pan z magnitude | 18.65 (0.02) | |||||||||||||||
| Pan y magnitude | 18.56 (0.03) | |||||||||||||||
| E(B-V) | 0.022 | |||||||||||||||
* Constant surface field
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