All names: Gaia DR2 620899404525808768, SDSS J093937.91+173953.6, SDSSJ093937.90+173953.6, Gaia EDR3 620899404525808768, [HHD2009] SDSS J0939+1739, LAMOST J093937.91+173953.6, WISE J093937.90+173953.7, SDSS J093937.90+173953.6, Gaia DR3 620899404525808768, SDSS J093937.92+173953.6, WD 0936+178
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Geier 2020 | Gaia DR2 | Stilism | sdss-wdms.org (29/04/2016) | Simbad | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 09 39 37.91 (0.2) | 09 39 37.91 | 09 39 37.91 | 09 39 37.91 (0.3) | 09 39 37.91 | 09 39 37.91 (0.2) | 09 39 38.16 | 09 39 37.91 | ||||
| Declination | 17 39 53.58 (0.1) | 17 39 53.62 | 17 39 53.64 | 17 39 53.58 (0.2) | 17 39 53.60 | 17 39 53.62 (0.1) | 17 39 47.52 | 17 39 53.64 | ||||
| Spectral type | DAO+M | sdO | DA+M | DAO+M | DA d | DAO+M | ||||||
| Effective temperature | [K] | 74735.0 (3863) | 79240.0 (5590) | 72136.0 (3505) | 68759.0 (2064) | |||||||
| log(g) | [cgs] | 7.06 (0.1) | 6.58 (0.06) | 7.03 (0.2) | 6.63 (0.1) | |||||||
| Mass | [M☉] | 0.44 (0.03) | 0.45 (0.04) | |||||||||
| log(Luminosity) | [L☉] | 1.47 (0.1) | ||||||||||
| Cooling age | [Gyr] | 0.0001 | ||||||||||
| 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] | 1.40 (0.2) | 1.12 (0.3) | 1.12 (0.3) | 1.40 (0.2) | |||||||
| Distance | [pc] | 713.66 (110) | 893.42 (235) | 893.40 (235) | 256.00 (11) | 713.67 (110) | ||||||
| Composition | H | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -2.456945666 (0.2) | -2.299 (0.4) | -2.299080496 (0.4) | -2.457 (0.2) | |||||||
| Proper motion (declination) | [mas/yr] | -2.712037147 (0.2) | -2.694 (0.4) | -2.694373529 (0.4) | -2.712 (0.2) | |||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | WDMS | |||||||||||
| B magnitude | ||||||||||||
| V magnitude | ||||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | ||||||||||||
| H magnitude | ||||||||||||
| K magnitude | ||||||||||||
| u magnitude | 16.83 (0.008) | 16.83 (0.008) | 16.92 | 16.83 (0.008) | 16.92 | 16.87 (0.02) | ||||||
| g magnitude | 17.26 (0.004) | 17.25 (0.004) | 17.27 | 17.26 (0.004) | 17.27 | 17.25 (0.02) | ||||||
| r magnitude | 17.72 (0.006) | 17.71 (0.006) | 17.72 | 17.72 (0.006) | 17.72 | 17.71 (0.01) | ||||||
| i magnitude | 17.79 (0.007) | 17.79 (0.007) | 17.81 | 17.79 (0.007) | 17.81 | 17.80 (0.02) | ||||||
| z magnitude | 17.75 (0.02) | 17.75 (0.02) | 17.75 | 17.75 (0.02) | 17.75 | 17.74 (0.02) | ||||||
| G magnitude | 17.49 (0.008) | 17.48 (0.003) | 17.48 | 17.49 (0.004) | ||||||||
| BP magnitude | 17.37 (0.008) | 17.29 (0.02) | 17.29 | |||||||||
| RP magnitude | 17.46 (0.01) | 17.43 (0.02) | 17.43 | |||||||||
| Pan g magnitude | 17.35 (0.005) | 17.35 (0.005) | ||||||||||
| Pan r magnitude | 17.73 (0.008) | 17.73 (0.008) | ||||||||||
| Pan i magnitude | 17.81 (0.005) | 17.81 (0.005) | ||||||||||
| Pan z magnitude | 17.78 (0.008) | 17.78 (0.008) | ||||||||||
| Pan y magnitude | 17.73 (0.01) | 17.73 (0.01) | ||||||||||
| E(B-V) | 0.026 | |||||||||||
* 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.