RR Coronae Borealis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 15h 41m 26.22899s[1] |
| Declination | +38° 33′ 26.5958″[1] |
| Apparent magnitude (V) | 7.3 - 8.2[2] |
| Characteristics | |
| Spectral type | M5III[3] (M3 - M6[2]) |
| Variable type | SRb[2] |
| Astrometry | |
| Radial velocity (Rv) | -58.39[4] km/s |
| Proper motion (μ) | RA: 20.24[1] mas/yr Dec.: -32.44[1] mas/yr |
| Parallax (π) | 2.93 ± 0.53 mas[1] |
| Distance | approx. 1,100 ly (approx. 340 pc) |
| Details | |
| Luminosity | 2,180[5] L☉ |
| Temperature | 3,309[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[2] 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.[5]
References
- ^ a b c d e 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
- ^ a b c d Otero, Sebastian Alberto (15 August 2011). "RR Coronae Borealis". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 20 July 2014.
- ^ 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.
- ^ 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.
- ^ a b c 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.
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