GD 20
All names: GD 20, uvby98 620001017, TIC 346977722, Gaia EDR3 2567944320460595840, PB 6522, GALEX J015740.9+071204, Gaia DR3 2567944320460595840, EGGR 206, GCRV 21685, Gaia DR2 2567944320460595840, GSC 00036-00907, 2MASS J01574114+0712054, WDJ015741.15+071205.56, SDSS J015741.11+071205.7, WD 0155+06, USNO-B1.0 0972-00024501, WD 0155+069, Feige 17, CSI+06-01551
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | MWDD H | Gaia DR2 | Stilism | Koester et al. 2014 | Gianninas et al. 2011 | Koester et al. 2009 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 01 57 41.06 (0.04) | 01 57 41.07 (0.06) | 01 57 41.06 | 01 57 41.15 (0.04) | 01 57 41.07 | 01 57 41.78 | |||||||
| Declination | 07 12 06.10 (0.03) | 07 12 06.09 (0.05) | 07 12 06.10 | 07 12 05.56 (0.03) | 07 12 06.09 | 07 12 05.76 | |||||||
| Spectral type | DA | DA | DA | DA2.2 | DA | ||||||||
| Effective temperature | [K] | 21266.0 | 21435.0 (291) | 22840.0 (355) | 22007.0 (56) | 22402.0 (351) | |||||||
| log(g) | [cgs] | 7.75 | 7.80 (0.09) | 7.84 (0.05) | 7.67 (0.008) | 7.79 (0.01) | |||||||
| Mass | [M☉] | 0.498 | 0.525 (0.04) | 0.55 (0.02) | 0.52 (0.01) | ||||||||
| log(Luminosity) | [L☉] | ||||||||||||
| Cooling age | [Gyr] | 0.0316 | |||||||||||
| 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) | <-8.30 | ||||||||||||
| 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] | 9.92 (0.05) | 10.05 (0.07) | 9.92 | 9.92 (0.05) | 10.05 (0.07) | |||||||
| Distance | [pc] | 100.81 (0.5) | 99.47 (0.7) | 102.00 | 100.81 | 100.81 (0.5) | 99.47 (0.7) | ||||||
| Composition | H | H | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -83.61990571 (0.05) | -83.52555868 (0.1) | -83.62 (0.05) | -83.52555868 | ||||||||
| Proper motion (declination) | [mas/yr] | 34.01176485 (0.04) | 34.15101503 (0.1) | 34.012 (0.04) | 34.15101503 | ||||||||
| Variability | |||||||||||||
| Magnetic | |||||||||||||
| Bd | [MG] | ||||||||||||
| Infrared excess (disk) | |||||||||||||
| Binarity | |||||||||||||
| B magnitude | 15.10 | ||||||||||||
| V magnitude | 15.47 (0.4) | 15.34 | 15.22 | ||||||||||
| R magnitude | 15.30 | ||||||||||||
| I magnitude | |||||||||||||
| J magnitude | 15.81 (0.007) | ||||||||||||
| H magnitude | 15.88 (0.02) | ||||||||||||
| K magnitude | 15.98 (0.03) | ||||||||||||
| u magnitude | 15.04 (0.005) | 15.05 (0.004) | |||||||||||
| g magnitude | 15.07 (0.004) | 15.08 (0.003) | |||||||||||
| r magnitude | 15.47 (0.005) | 15.48 (0.004) | |||||||||||
| i magnitude | 15.80 (0.005) | 15.79 (0.004) | |||||||||||
| z magnitude | 16.09 (0.008) | 16.08 (0.008) | |||||||||||
| G magnitude | 15.28 (0.002) | 15.31 | 15.28 | 15.28 (0.003) | 15.31 | ||||||||
| BP magnitude | 15.19 (0.002) | 15.16 | 15.16 | ||||||||||
| RP magnitude | 15.50 (0.003) | 15.49 | 15.49 | ||||||||||
| Pan g magnitude | 15.11 (0.007) | ||||||||||||
| Pan r magnitude | 15.50 (0.003) | ||||||||||||
| Pan i magnitude | 15.81 (0.001) | ||||||||||||
| Pan z magnitude | 16.09 (0.003) | ||||||||||||
| Pan y magnitude | 16.25 (0.007) | ||||||||||||
| E(B-V) | 0.010 | ||||||||||||
* Constant surface field
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