Feige 55

Feige 55
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]
Distance650 ± 5 ly
(199 ± 2 pc)
Details
Mass0.486/0.3 M☉
Radius0.0345/0.33? R☉
Luminosity10.7/0.0079 L☉
Temperature56,300/3000? K
Other designations
Gaia DR2 1582231699483080192, WD 1202+608, 2MASS J12043856+6032082[2]
Database references
SIMBADdata

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

  1. ^ 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.
  2. ^ "Feige 55". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-12.
  3. ^ 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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