S Apodis

S Apodis
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension 15h 09m 24.53447s[1]
Declination −72° 03 45.1898[1]
Apparent magnitude (V) 9.7[2]
Characteristics
Spectral type C
Variable type R Coronae Borealis variable
Astrometry
Radial velocity (Rv)-75.00 km/s
Proper motion (μ) RA: -7.52 ± 1.28[1] mas/yr
Dec.: -2.96 ± 1.53[1] mas/yr
Details
Luminosity960[3] L
Temperature3916[3] K
Other designations
CD-71° 1120, HD 133444, HIP 74179
Database references
SIMBADdata

S Apodis (HD 133444) is an R Coronae Borealis variable star located in the far southern constellation Apus. 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.[2] Located around 5000 light-years distant, it shines with a luminosity approximately 960 times that of the Sun and has a surface temperature of 3916 K.[3]

References

  1. 1 2 3 4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. 1 2 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:1211.2475Freely accessible. Bibcode:2013A&A...551A..77T. doi:10.1051/0004-6361/201220713. A77.
  3. 1 2 3 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:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
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