RR Coronae Borealis explained

RR Coronae Borealis should not be confused with R Coronae Borealis.

RR Coronae Borealis (RR CrB, HD 140297, HIP 76844) is a M3-type semiregular variable star located in the constellation Corona Borealis with a parallax of 2.93mas being a distance of 341pc. It varies between magnitudes 7.3 and 8.2 over 60.8 days.[1] Located around 1228 light-years distant, it shines with a luminosity approximately 2180 times that of the Sun and has a surface temperature of 3309 K.[2]

Notes and References

  1. Web site: RR Coronae Borealis. Otero, Sebastian Alberto . 15 August 2011 . The International Variable Star Index. American Association of Variable Star Observers. 20 July 2014.
  2. McDonald, I.. Zijlstra, A. A.. Boyer, M. L.. 2012. Fundamental Parameters and Infrared Excesses of Hipparcos Stars. Monthly Notices of the Royal Astronomical Society. 427. 1. 343–57. 2012MNRAS.427..343M. 1208.2037 . 10.1111/j.1365-2966.2012.21873.x . 118665352.

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