V Coronae Australis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 47m 32.31315s [1] |
| Declination | −38° 09′ 32.3250″ [1] |
| Characteristics | |
| Evolutionary stage | R Coronae Borealis variable |
| Astrometry | |
| Proper motion (μ) | RA: -0.90 ± 4.27[2] mas/yr Dec.: -3.83 ± 2.81[2] mas/yr |
| Parallax (π) | -0.39 ± 2.95[2] mas |
| Details | |
| Mass | 0.6[3] M☉ |
| Temperature | 6250[3] K |
| Other designations | |
V Coronae Australis (V CrA) is a R Coronae Borealis variable star in the constellation Corona Australis. These are extremely hydrogen-deficient supergiants thought to have arisen as the result of the merger of two white dwarfs; fewer than 100 have been discovered as of 2012.[4] V Coronae Borealis dimmed in brightness from 1994 to 1998.[5]
It has around 60% the mass of the Sun and an effective (surface) temperature of around 6250 K.[3]
References
- 1 2 SIMBAD, V Coronae Australis (accessed 13 July 2014)
- 1 2 3 van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 Stasińska, G.; Szczerba, R.; Schmidt, M.; Siódmiak, N. (2006). "Post-AGB stars as testbeds of nucleosynthesis in AGB stars". Astronomy and Astrophysics 450 (2): 701. arXiv:astro-ph/0601504. Bibcode:2006A&A...450..701S. doi:10.1051/0004-6361:20053553.
- ↑ Tisserand; Clayton; Welch; Pilecki; Wyrzykowski; Kilkenny (2012). "The Ongoing Pursuit of R Coronae Borealis Stars: ASAS-3 Survey Strikes Again". Astronomy & Astrophysics 551: 22. arXiv:1211.2475. Bibcode:2013A&A...551A..77T. doi:10.1051/0004-6361/201220713. A77.
- ↑ Skuljan, L.; Cottrell, P. L. (2002). "Recent declines of RS Telescopii, UW Centauri, and V Coronae Australis". The Observatory 122: 322–29. Bibcode:2002Obs...122..322S.
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