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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 12h 04m 38.5357s [1] |
| Declination | +60° 32′ 08.0865″ [1] |
| Apparent magnitude (V) | +13.45 |
| Characteristics | |
| Spectral type | DAO+M5.5V |
| Astrometry | |
| Proper motion (μ) |
RA: −54.744±0.065
[1]
mas/
yr Dec.: −34.855±0.061 [1] mas/ yr |
| Parallax (π) | 5.0141 ± 0.0419 mas [1] |
| Distance | 650 ± 5
ly (199 ± 2 pc) |
| Details | |
| Mass | 0.486/0.3 M☉ |
| Radius | 0.0345/0.33? R☉ |
| Luminosity | 10.7/0.0079 L☉ |
| Temperature | 56,300/3000? K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Feige 55 is a hot white dwarf approximately 650 light-years away from the Sun in the constellation of Ursa Major. The star is likely a post-AGB star with relatively high luminosity for a standard white dwarf. It is also in a close binary system with orbital period of 1.4933 days. [3]
References
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ "Feige 55". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-12.
- ^ Holberg; et al. (1995). "The Binary Double-degenerate Nature of the Bright DAO White Dwarf Feige 55". The Astrophysical Journal Letters. 452 (2): 133–137. Bibcode: 1995ApJ...452L.133H. doi: 10.1086/309735.
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