All names: GALEX J184038.0+642313, J1840+6423, USNO-B1.0 1543-00213668, Gaia DR2 2256447694151327488, SDSS J184037.78+642312.3, Gaia DR3 2256447694151327488, Gaia EDR3 2256447694151327488, EQ J1840+6423
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Gaia DR2 | Stilism | Gianninas et al. 2014 | Hermes et al. 2012 | Simbad |
|---|---|---|---|---|---|---|---|---|
| Right ascension | 18 40 37.78 (0.1) | 18 40 37.78 (0.2) | 18 40 37.79 (0.1) | |||||
| Declination | 64 23 11.87 (0.2) | 64 23 11.88 (0.2) | 64 23 12.27 (0.2) | |||||
| Spectral type | DA | DA | ||||||
| Effective temperature | [K] | 9380.0 (130) | 9100.0 | |||||
| log(g) | [cgs] | 6.55 (0.05) | 6.22 | |||||
| Mass | [M☉] | 0.183 | ||||||
| log(Luminosity) | [L☉] | |||||||
| Cooling age | [Gyr] | 1.5610 (0.4) | ||||||
| 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] | 1.30 (0.2) | 1.20 (0.2) | 1.30 (0.2) | ||||
| Distance | [pc] | 770.31 (95) | 831.30 (142) | 621.00 (89) | 770.30 (95) | |||
| Composition | H | |||||||
| Proper motion (right ascension) | [mas/yr] | -4.479565616 (0.2) | -4.926366062 (0.4) | -4.48 (0.2) | ||||
| Proper motion (declination) | [mas/yr] | -25.38704744 (0.2) | -26.11779472 (0.5) | -25.387 (0.2) | ||||
| Variability | VAR | VAR | ||||||
| Magnetic | ||||||||
| Bd | [MG] | |||||||
| Infrared excess (disk) | ||||||||
| Binarity | WDMS | |||||||
| B magnitude | 18.60 | |||||||
| V magnitude | 18.90 | |||||||
| R magnitude | 19.40 | |||||||
| I magnitude | ||||||||
| J magnitude | ||||||||
| H magnitude | ||||||||
| K magnitude | ||||||||
| u magnitude | 19.85 (0.05) | |||||||
| g magnitude | 18.93 (0.009) | |||||||
| r magnitude | 19.00 (0.01) | |||||||
| i magnitude | 19.07 (0.01) | |||||||
| z magnitude | 19.31 (0.07) | |||||||
| G magnitude | 18.88 (0.03) | 18.91 | 18.88 (0.005) | |||||
| BP magnitude | 18.99 (0.03) | 18.97 | ||||||
| RP magnitude | 18.72 (0.03) | 18.78 | ||||||
| Pan g magnitude | 18.90 (0.02) | |||||||
| Pan r magnitude | 18.96 (0.01) | |||||||
| Pan i magnitude | 19.05 (0.01) | |||||||
| Pan z magnitude | 19.15 (0.02) | |||||||
| Pan y magnitude | 19.20 (0.03) | |||||||
| E(B-V) | 0.040 | |||||||
| Period #1 | [s] | 1578.6 | ||||||
| Amplitude #1 | [mma] | 29.5 | ||||||
| Period #2 | [s] | 2376.0 | ||||||
| Amplitude #2 | [mma] | 48.8 | ||||||
| Period #3 | [s] | 4445.9 | ||||||
| Amplitude #3 | [mma] | 65.9 | ||||||
* 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.