All names: SDSS J234048.73+081753.3, WD 2338+080, SDSS J234048.74+081753.4, Gaia DR3 2758086538448464512, SDSS J234048.74+081753.3, J2340+0817, Gaia EDR3 2758086538448464512, Gaia DR2 2758086538448464512
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Blouin 2020 | Coutu et al. 2019 | Gaia DR2 | Hollands et al. 2017 | Stilism | Koester et al. 2011 | Simbad | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 23 40 48.83 (0.5) | 23 40 48.74 | 23 40 48.68 | 23 40 48.82 (0.7) | 23 40 48.68 (0.5) | 23 40 48.91 | 23 40 48.74 | |||||||
| Declination | 08 17 53.56 (0.3) | 08 17 53.34 | 08 17 53.20 | 08 17 53.55 (0.4) | 08 17 53.20 (0.3) | 08 17 50.28 | 08 17 53.36 | |||||||
| Spectral type | DZ | DZ | DZ | DZ | DZ | DZ | DZ | DZ | ||||||
| Effective temperature | [K] | 6151.0 (156) | 6123.0 (146) | 5550.0 (120) | 6300.0 | 6307.0 (13) | ||||||||
| log(g) | [cgs] | 8.14 (0.2) | 8.18 | 8.00 (0) | 10.00 (0.009) | |||||||||
| Mass | [M☉] | 0.661 (0.1) | 0.6857 | |||||||||||
| log(Luminosity) | [L☉] | |||||||||||||
| Cooling age | [Gyr] | 3.6200 | 4.5000 | |||||||||||
| log(H/He) | <-3.014 | |||||||||||||
| log(C/He) | ||||||||||||||
| log(Ca/He) | -8.7 (0.2) | -8.6473 (0.2) | -9.0 | -8.4 | ||||||||||
| log(Ca/H) | ||||||||||||||
| log(N/He) | ||||||||||||||
| log(O/He) | ||||||||||||||
| log(Na/He) | ||||||||||||||
| log(Mg/He) | -7.4 (0.3) | -7.99 | -7.5 | |||||||||||
| log(Al/He) | ||||||||||||||
| log(Si/He) | ||||||||||||||
| log(P/He) | ||||||||||||||
| log(S/He) | ||||||||||||||
| log(Cl/He) | ||||||||||||||
| log(Sc/He) | ||||||||||||||
| log(Ti/He) | ||||||||||||||
| log(V/He) | ||||||||||||||
| log(Cr/He) | ||||||||||||||
| log(Mn/He) | ||||||||||||||
| log(Fe/He) | -7.2 (0.3) | -7.69 | -7.5 | |||||||||||
| log(Co/He) | ||||||||||||||
| log(Ni/He) | ||||||||||||||
| log(Cu/He) | ||||||||||||||
| log(Zn/He) | ||||||||||||||
| log(Ga/He) | ||||||||||||||
| log(Ge/He) | ||||||||||||||
| log(Sr/He) | ||||||||||||||
| Parallax | [mas] | 6.86 (0.6) | 6.85 | 6.85 (0.9) | 6.86 (0.6) | |||||||||
| Distance | [pc] | 145.87 (12) | 149.62 (22) | 146.04 (19) | 146.04 (19) | 132.00 (16) | 145.87 (12) | |||||||
| Composition | He | He | He | He | ||||||||||
| Proper motion (right ascension) | [mas/yr] | 137.111982 (0.7) | 136.3499529 (1) | 137.112 (0.7) | ||||||||||
| Proper motion (declination) | [mas/yr] | 22.72679041 (0.4) | 22.40720225 (0.7) | 22.727 (0.4) | ||||||||||
| Variability | ||||||||||||||
| Magnetic | ||||||||||||||
| Bd | [MG] | |||||||||||||
| Infrared excess (disk) | ||||||||||||||
| Binarity | ||||||||||||||
| B magnitude | ||||||||||||||
| V magnitude | ||||||||||||||
| R magnitude | ||||||||||||||
| I magnitude | ||||||||||||||
| J magnitude | ||||||||||||||
| H magnitude | ||||||||||||||
| K magnitude | ||||||||||||||
| u magnitude | 22.87 (0.3) | 22.68 (1) | 22.68 (1) | 22.73 (0.3) | 22.87 (0.3) | 22.73 | 22.73 (0.3) | |||||||
| g magnitude | 20.25 (0.02) | 20.25 (0.02) | 20.25 (0.02) | 20.25 (0.02) | 20.25 (0.02) | 20.24 | 20.25 (0.02) | |||||||
| r magnitude | 19.80 (0.02) | 19.81 (0.02) | 19.81 (0.02) | 19.82 (0.02) | 19.80 (0.02) | 19.81 | 19.82 (0.02) | |||||||
| i magnitude | 19.85 (0.02) | 19.86 (0.03) | 19.86 (0.03) | 19.87 (0.03) | 19.85 (0.02) | 19.86 | 19.87 (0.03) | |||||||
| z magnitude | 19.94 (0.08) | 19.93 (0.07) | 19.93 (0.07) | 19.95 (0.07) | 19.94 (0.08) | 19.94 | 19.95 (0.07) | |||||||
| G magnitude | 19.91 (0.08) | 19.97 | 19.91 (0.006) | |||||||||||
| BP magnitude | 20.21 (0.08) | 20.14 | ||||||||||||
| RP magnitude | 19.51 (0.06) | 19.47 | ||||||||||||
| Pan g magnitude | 20.16 (0.02) | |||||||||||||
| Pan r magnitude | 19.80 (0.007) | |||||||||||||
| Pan i magnitude | 19.84 (0.01) | |||||||||||||
| Pan z magnitude | 19.96 (0.04) | |||||||||||||
| Pan y magnitude | 19.84 (0.06) | |||||||||||||
| 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.