R Normae is a Mira variable star located near Eta Normae[10] in the southern constellation of Norma. This is an intermediate-mass red giant star that is generating part of its energy through hydrogen fusion. Because this fusion is thought to be occurring under conditions of convection, it is generating an excess of lithium.[11] The star ranges from magnitude 6.5 to 12.8 and has a relatively long period of 496 days.[4] Located around 2,900[7] light-years distant, it shines with a luminosity 7764 times that of the Sun and has a surface temperature of 3161 K.[8]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Norma |
| Right ascension | 15h 35m 57.35429s[2] |
| Declination | −49° 30′ 28.6817″[2] |
| Apparent magnitude (V) | 7.69[3] (6.5–12.8)[4] |
| Characteristics | |
| Spectral type | M3-7[5] |
| U−B color index | +1.33[3] |
| B−V color index | +1.77[3] |
| Variable type | Mira[5] |
| Astrometry | |
| Radial velocity (Rv) | −22.0[6] km/s |
| Proper motion (μ) | RA: −0.63[2] mas/yr Dec.: −7.09[2] mas/yr |
| Parallax (π) | 1.72 ± 2.79 mas[2] |
| Distance | 2,900 ly (900 pc)[7] ly |
| Details | |
| Luminosity | 7,764[8] L☉ |
| Temperature | 3,161[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ 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 Landolt, A. U. (October 1973). "UBV observations of long-period variable stars, VIII". Publications of the Astronomical Society of the Pacific. 85: 625. Bibcode:1973PASP...85..625L. doi:10.1086/129515.
- ^ a b Watson, Christopher (12 March 2014). "R Normae". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 March 2015.
- ^ a b Uttenthaler, S.; van Stiphout, K.; Voet, K.; van Winckel, H.; et al. (2011). "The evolutionary state of Miras with changing pulsation periods". Astronomy & Astrophysics. 531: A88. arXiv:1105.2198. Bibcode:2011A&A...531A..88U. doi:10.1051/0004-6361/201116463. S2CID 56226953.
- ^ Turon, C.; et al. (July 1993). "Version 2 of the HIPPARCOS Input Catalogue". Bulletin Inf. Cent. Donnees Astron. Strasbourg. 43: 5. Bibcode:1993BICDS..43....5T.
- ^ a b Whitelock, Patricia; Marang, Freddy; Feast, Michael (December 2000). "Infrared colours for Mira-like long-period variables found in the (M-dot <~ 10−7 M☉ yr−1) Hipparcos Catalogue". Monthly Notices of the Royal Astronomical Society. 319 (3): 728–758. Bibcode:2000MNRAS.319..728W. doi:10.1046/j.1365-8711.2000.03743.x.
- ^ 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.
- ^ "V* R Normae -- Variable Star of Mira Ceti type". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 21 March 2015.
- ^ Arnold, H.J.P; Doherty, Paul; Moore, Patrick (1999). The Photographic Atlas of the Stars. Boca Raton, Florida: CRC Press. p. 176. ISBN 978-0-7503-0654-6.
- ^ Uttenthaler, S.; et al. (2012). "Lithium destruction and production observed in red giant stars". Memorie della Societa Astronomica Italiana Supplement. 22: 56. arXiv:1206.2759. Bibcode:2012MSAIS..22...56U.
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