All names: WD 1640+113, Gaia DR3 4447202622266019072, SDSS J164254.66+111641.5, PG 1640+114, SDSS J164254.66+111641.6, TIC 277880034, USNO-B1.0 1012-00261082, UCAC4 507-060935, GALEX J164254.7+111641, Gaia EDR3 4447202622266019072, Gaia DR2 4447202622266019072, 2MASS J16425468+1116416
| Parameter | Unit | Gaia EDR3 | Gaia DR2 | Stilism | Gianninas et al. 2011 | Koester et al. 2009 | Vincent et al. 2024 | Simbad | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 42 54.63 (0.03) | 16 42 54.63 (0.05) | 16 42 54.63 | 16 42 54.68 (0.03) | 16 42 54.17 | ||||
| Declination | 11 16 41.14 (0.03) | 11 16 41.16 (0.05) | 11 16 41.14 | 11 16 41.64 (0.03) | 11 16 36.48 | ||||
| Spectral type | DA | DA | DA2.5 | DA2 | |||||
| Effective temperature | [K] | 20410.0 (321) | 19718.0 (40) | 19980.0 (252) | |||||
| log(g) | [cgs] | 8.06 (0.05) | 7.85 (0.008) | 8.01 (0.01) | |||||
| Mass | [M☉] | 0.66 (0.03) | 0.629 (0.01) | ||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| 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] | 8.81 (0.04) | 8.93 (0.06) | 8.81 | 8.81 (0.04) | ||||
| Distance | [pc] | 113.52 (0.6) | 111.92 (0.8) | 110.00 | 113.52 | 113.52 (0.6) | |||
| Composition | H | ||||||||
| Proper motion (right ascension) | [mas/yr] | -46.64670474 (0.05) | -46.95539743 (0.1) | -46.647 (0.05) | |||||
| Proper motion (declination) | [mas/yr] | -30.89974302 (0.04) | -31.12341027 (0.1) | -30.9 (0.04) | |||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 16.09 (0.06) | ||||||||
| V magnitude | 16.03 | 16.02 (0.1) | |||||||
| R magnitude | 15.67 (0.6) | ||||||||
| I magnitude | |||||||||
| J magnitude | 16.62 (0.1) | ||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 15.89 (0.01) | ||||||||
| g magnitude | 15.89 (0.01) | ||||||||
| r magnitude | 16.28 (0.01) | ||||||||
| i magnitude | 16.59 (0.01) | ||||||||
| z magnitude | 16.85 (0.02) | ||||||||
| G magnitude | 16.09 (0.002) | 16.11 | 16.09 | 16.09 (0.003) | |||||
| BP magnitude | 16.01 (0.002) | 15.99 | |||||||
| RP magnitude | 16.27 (0.004) | 16.27 | |||||||
| Pan g magnitude | |||||||||
| Pan r magnitude | |||||||||
| Pan i magnitude | |||||||||
| Pan z magnitude | |||||||||
| Pan y magnitude | |||||||||
| E(B-V) | 0.012 | ||||||||
* 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.