U Coronae Borealis

U Coronae Borealis (U CrB) is an Algol-type eclipsing binary star system in the constellation Corona Borealis. Its apparent magnitude varies between 7.66 and 8.79 over a period of 3.45 days[2] The component stars are a blue-white main sequence star of spectral type B6V and a cooler yellow-white subgiant star of spectral type F8III-IV.[3]

U Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension  15h 18m 11.35252s[1]
Declination +31° 38′ 49.4159″[1]
Spectral typeB6 V + F8 III-IV[1]
Other designations
BD+32° 2569, HD 136175, HIP 74881, SAO 64619[1]

References
  1. "V* U CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 March 2015.
  2. VSX (4 January 2010). "U Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2015.
  3. Ibanoǧlu, C.; DervişoǧLu, A.; Ćakırlı, Ö.; Sipahi, E.; Yüce, K. (2012). "Carbon deficiencies in the primaries of some classical Algols". Monthly Notices of the Royal Astronomical Society. 419 (2): 1472–79. arXiv:1109.1939. Bibcode:2012MNRAS.419.1472I. doi:10.1111/j.1365-2966.2011.19812.x.
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