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RR Coronae Borealis

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M3-type semiregular variable star in the constellation Corona Borealis Not to be confused with R Coronae Borealis.
RR Coronae Borealis

A light curve for RR Coronae Borealis, plotted from Hipparcos data
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Borealis
Right ascension 15 41 26.22899
Declination +38° 33′ 26.5958″
Apparent magnitude (V) 7.3 - 8.2
Characteristics
Spectral type M5III (M3 - M6)
Variable type SRb
Astrometry
Radial velocity (Rv)-58.39 km/s
Proper motion (μ) RA: 20.24 mas/yr
Dec.: -32.44 mas/yr
Parallax (π)2.93 ± 0.53 mas
Distanceapprox. 1,100 ly
(approx. 340 pc)
Details
Luminosity2,180 L☉
Temperature3,309 K
Other designations
RR CrB, BD+39° 2901, HD 140297, HIP 76844, SAO 64848, GC 21108, TYC 3053-1035-1, 2MASS J15412622+3833266
Database references
SIMBADdata

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 341 parsecs (1,110 ly). It varies between magnitudes 7.3 and 8.2 over 60.8 days. 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.

In 1907 it was announced that Williamina Fleming had discovered that the star, listed then as BD +39° 2901, is a variable star. She had determined that from the examination of 26 photographic plates taken from 1892 to 1907. It was given its variable star designation, RR Coronae Borealis, in 1908.

References

  1. "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  3. ^ Otero, Sebastian Alberto (15 August 2011). "RR Coronae Borealis". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 20 July 2014.
  4. Yoon, Dong-Hwan; Cho, Se-Hyung; Kim, Jaeheon; Yun, Young joo; Park, Yong-Sun (2014). "SiO and H2O Maser Survey toward Post-asymptotic Giant Branch and Asymptotic Giant Branch Stars". The Astrophysical Journal Supplement. 211 (1): 15. Bibcode:2014ApJS..211...15Y. doi:10.1088/0067-0049/211/1/15. S2CID 73561291.
  5. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
  6. ^ 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. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
  7. Fleming, Williamina; Pickering, Edward C. (October 1907). "Stars Having Peculiar Spectra. 15 New Variable Stars". Harvard College Observatory Circular. 132: 1–3. Bibcode:1907HarCi.132....1F. Retrieved 16 December 2024.
  8. Dunér, Nils Christofer; Hartwig, Ernst; Müller, G. (October 1908). "Benennung von neu entdeckten veränderlichen Sternen". Astronomische Nachrichten. 179 (6): 85–92. Bibcode:1908AN....179...85D. doi:10.1002/asna.19081790602. Retrieved 16 December 2024.
  9. "RR CrB". The International Variable Star Index. AAVSO. Retrieved 16 December 2024.
Constellation of Corona Borealis
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