R Carinae

R Carinae is a double star in the southern constellation of Carina. The brighter component is a variable star that can be viewed with the naked eye at peak brightness,[8] but is usually too faint to be seen without a telescope, having an apparent visual magnitude that fluctuates around 7.43.[5] This star is located at a distance of approximately 1,300 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +28 km/s.[5]

This article is about the variable star. For r Carinae, see HD 91942.
R Carinae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 09h 32m 14.59964s[1]
Declination −62° 47′ 20.0452″[1]
Apparent magnitude (V) 3.9 - 10.5[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M6/7pe[4]
B−V color index 0.906±0.009[5]
Variable type Mira[2]
Astrometry
Radial velocity (Rv)+28.1±1.0[5] km/s
Proper motion (μ) RA: −37.900[1] mas/yr
Dec.: +22.232[1] mas/yr
Parallax (π)2.5813 ± 0.4460[1] mas
Distanceapprox. 1,300 ly
(approx. 390 pc)
Absolute magnitude (MV)1.48[5] (at mv = 7.43)
Details
Mass0.87+0.47
−0.31[3] M☉
Radius241.0+37.6
−32.6[3] R☉
Luminosity4,571+1,331
−1,031[3] L☉
Temperature2,800[6] K
Other designations
R Car, CD−62°396, GC 13192, HD 82901, HIP 46806, HR 3816, SAO 250614, CCDM J09322-6247, WDS J09322-6247AB[7]
Database references
SIMBADdata

The main component is an aging red giant star on the asymptotic giant branch[3] with a stellar classification of M6/7pe.[4] It is classified as a pulsating Mira type variable star and its visual brightness varies with an average amplitude of 4.25 magnitudes over a period of 303.99±1.08 d. Its average maximum visual magnitude is 5.05±0.45,[8] but the brightest observed maximum was magnitude 3.9[2] This star is surrounded by a dusty shell, with properties that are consistent with iron-poor silicates or corundum, extending from around three stellar radii outward.[9]

The companion is a magnitude 11.30 star at an angular separation of 2.10″ along a position angle of 132° from the main star, as of 2015.[10]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  3. Takeuti, Mine; et al. (2013), "A Method to Estimate the Masses of Asymptotic Giant Branch Variable Stars", Publications of the Astronomical Society of Japan, 65 (3): 60, Bibcode:2013PASJ...65...60T, doi:10.1093/pasj/65.3.60.
  4. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  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, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  7. "R Car". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-30.
  8. Vogt, N.; et al. (2016), "Determination of Pulsation Periods and Other Parameters of 2875 Stars Classified As Mira in the All Sky Automated Survey (Asas)", The Astrophysical Journal Supplement Series, 227 (1): 6, arXiv:1609.05246, Bibcode:2016ApJS..227....6V, doi:10.3847/0067-0049/227/1/6, S2CID 119295645.
  9. Ireland, M. J.; et al. (July 2005), "Dust scattering in the Miras R Car and RR Sco resolved by optical interferometric polarimetry", Monthly Notices of the Royal Astronomical Society, 361 (1): 337–344, arXiv:astro-ph/0505112, Bibcode:2005MNRAS.361..337I, doi:10.1111/j.1365-2966.2005.09181.x, S2CID 14724805.
  10. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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