GD 187
All names: NLTT 40881, UCAC2 43451893, GALEX J154033.3+330854, LSPM J1540+3308, Gaia DR2 1370654257498865536, SDSS J154033.32+330852.8, J1540+3308, WDJ154033.36+330852.51, LTT 14655, 2MASS J15403338+3308524, Gaia EDR3 1370654257498865536, PM J15405+3308N, TIC 16992652, Gaia DR3 1370654257498865536, 15405+3308N, SDSS J154033.31+330852.8, WD 1538+333, GD 187, USNO-B1.0 1231-00272548, LP 273-64
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Kilic et al. 2025 | O'Brien et al. 2024 | Caron et al. 2023 | Kilic et al. 2020 | McCleery et al. 2020 | MWDD H | Gaia DR2 | Stilism | Limoges et al. 2015 | Sion et al. 2014 | Giammichele et al. 2012 | Kawka et Vennes 2006 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 15 40 33.15 (0.01) | 15 40 33.16 (0.02) | 15 40 33.16 (0.02) | 15 40 33.36 | 15 40 33.15 | 15 40 33.36 (0.01) | 15 40 33.16 | 15 40 33.96 | |||||||||||
| Declination | 33 08 53.85 (0.02) | 33 08 53.81 (0.03) | 33 08 53.81 (0.03) | 33 08 49.20 | 33 08 53.85 | 33 08 52.50 (0.02) | 33 08 53.81 | 33 08 47.76 | |||||||||||
| Spectral type | DA | DA | DA | DA | DA | DA | DA | DA5.6 | DA | DA | DA | DA | DA5.6 | ||||||
| Effective temperature | [K] | 8813.0 (56) | 8726.0 (73) | 8702.0 (34) | 8812.0 (58) | 8751.9 (33) | 8617.0 | 8780.0 (125) | 8940.0 | 8899.0 (127) | 8940.0 (100) | 8616.0 (30) | |||||||
| log(g) | [cgs] | 8.06 (0.01) | 8.04 (0.02) | 8.04 (0.005) | 8.06 (0.01) | 8.05 (0.01) | 8.02 | 8.15 (0.05) | 8.05 (0.05) | 8.44 (0.1) | 8.02 (0.006) | ||||||||
| Mass | [M☉] | 0.633 (0.009) | 0.62 (0.01) | 0.62 (0.005) | 0.633 (0.009) | 0.611 | 0.69 (0.03) | 0.63 (0.03) | 0.88 (0.06) | 0.607 (0.005) | |||||||||
| log(Luminosity) | [L☉] | -3.15 | -3.06 | ||||||||||||||||
| Cooling age | [Gyr] | 0.9500 | 0.9175 | 0.8800 | |||||||||||||||
| 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] | 33.83 (0.02) | 33.83 (0.02) | 33.84 (0.03) | 33.84 (0.03) | 33.84 (0.03) | 33.83 | 33.83 (0.02) | 33.84 (0.03) | ||||||||||
| Distance | [pc] | 29.56 (0.02) | 29.56 (0.02) | 29.55 (0.03) | 29.55 (0.03) | 29.55 (0.03) | 27.50 (0.8) | 22.72 | 29.10 (1) | 22.00 | 29.56 | 29.56 (0.02) | 29.55 (0.03) | ||||||
| Composition | H | H | H | H | H | H | |||||||||||||
| Proper motion (right ascension) | [mas/yr] | -163.5029168 (0.02) | -163.5844076 (0.04) | -163.503 (0.02) | -163.5844076 | ||||||||||||||
| Proper motion (declination) | [mas/yr] | 84.38126854 (0.03) | 84.33830304 (0.06) | 84.381 (0.03) | 84.33830304 | ||||||||||||||
| Variability | |||||||||||||||||||
| Magnetic | |||||||||||||||||||
| Bd | [MG] | ||||||||||||||||||
| Infrared excess (disk) | |||||||||||||||||||
| Binarity | |||||||||||||||||||
| B magnitude | 16.00 | ||||||||||||||||||
| V magnitude | 15.03 | ||||||||||||||||||
| R magnitude | 15.00 | ||||||||||||||||||
| I magnitude | |||||||||||||||||||
| J magnitude | 14.76 (0.005) | 14.77 (0.03) | |||||||||||||||||
| H magnitude | 14.70 (0.06) | 14.70 (0.06) | |||||||||||||||||
| K magnitude | 14.49 (0.06) | 14.49 (0.06) | |||||||||||||||||
| u magnitude | 15.51 (0.005) | 15.52 (0.005) | 15.52 (0.005) | 0.40 | |||||||||||||||
| g magnitude | 15.11 (0.003) | 15.11 (0.003) | |||||||||||||||||
| r magnitude | 15.11 (0.003) | 15.11 (0.003) | |||||||||||||||||
| i magnitude | 15.18 (0.004) | 15.18 (0.004) | |||||||||||||||||
| z magnitude | 15.30 (0.005) | 15.30 (0.005) | |||||||||||||||||
| G magnitude | 15.05 (0.001) | 15.07 | 15.07 | 15.05 | 15.05 (0.003) | 15.07 | |||||||||||||
| BP magnitude | 15.15 (0.001) | 15.13 | 15.13 | ||||||||||||||||
| RP magnitude | 14.87 (0.001) | 14.88 | 14.88 | ||||||||||||||||
| Pan g magnitude | 15.13 (0.006) | 15.15 (0.006) | |||||||||||||||||
| Pan r magnitude | 15.12 (0.002) | 15.13 (0.007) | |||||||||||||||||
| Pan i magnitude | 15.19 (0.005) | 15.19 (0.003) | |||||||||||||||||
| Pan z magnitude | 15.31 (0.005) | 15.31 (0.004) | |||||||||||||||||
| Pan y magnitude | 15.39 (0.01) | 15.41 (0.006) | |||||||||||||||||
| E(B-V) | 0.002 | ||||||||||||||||||
* Constant surface field
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