 The visual band light curve of R Carinae, from AAVSO data | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 09 32 14.59610 |
| Declination | −62° 47′ 20.0026″ |
| Apparent magnitude (V) | 3.9 - 10.5 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M6/7pe |
| B−V color index | 0.906±0.009 |
| Variable type | Mira |
| Astrometry | |
| Radial velocity (Rv) | +28.1±1.0 km/s |
| Proper motion (μ) | RA: −36.291 mas/yr Dec.: +19.535 mas/yr |
| Parallax (π) | 5.5018 ± 0.3345 mas |
| Distance | 590 ± 40 ly (180 ± 10 pc) |
| Absolute magnitude (MV) | 1.48 (at mv = 7.43) |
| Details | |
| Mass | 0.87+0.47 −0.31 M☉ |
| Radius | 400±2 (2013) R☉ 581–652 (2018) R☉ 540±50 (2020) R☉ |
| Luminosity | 4,571+1,331 −1,031 L☉ |
| Temperature | 2,800 K |
| Other designations | |
| R Car, CD−62°396, GC 13192, HD 82901, HIP 46806, HR 3816, SAO 250614, CCDM J09322-6247, WDS J09322-6247AB | |
| Database references | |
| SIMBAD | data |
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, but is usually too faint to be seen without a telescope, having an apparent visual magnitude that fluctuates around 7.43. This star is located at a distance of approximately 600 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +28 km/s.
Benjamin Apthorp Gould discovered the variable star, in 1871. It appeared with its variable star designation in Annie Jump Cannon's 1907 work, Second Catalogue of Variable Stars. The main component is an aging red giant star on the asymptotic giant branch with a stellar classification of M6/7pe. 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, but the brightest observed maximum was magnitude 3.9. The pulsations make its size change, in 2014, it was 400 times larger than the Sun, while in 2020 it was 540 times larger. 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.
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.
References
- "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ 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.
- ^ 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.
- ^ Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ 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.
- ^ Rosales-Guzmán, A.; Sanchez-Bermudez, J.; Paladini, C.; Freytag, B.; Wittkowski, M.; Alberdi, A.; Baron, F.; Berger, J.-P.; Chiavassa, A.; Höfner, S.; Jorissen, A.; Kervella, P.; Bouquin, J.-B. Le; Marigo, P.; Montargès, M. (2024-08-01), "A new dimension in the variability of AGB stars: Convection patterns size changes with pulsation", Astronomy & Astrophysics, 688: A124, arXiv:2405.10164, doi:10.1051/0004-6361/202349112, ISSN 0004-6361
- Rosales-Guzmán, A.; Sanchez-Bermudez, J.; Paladini, C.; Alberdi, A.; Brandner, W.; Cannon, E.; González-Torá, G.; Haubois, X.; Henning, Th; Kervella, P.; Montarges, M.; Perrin, G.; Schödel, R.; Wittkowski, M. (2023-06-01). "Imaging the innermost gaseous layers of the Mira star R Car with GRAVITY-VLTI". Astronomy & Astrophysics. 674: A62. arXiv:2303.00056. doi:10.1051/0004-6361/202245370. ISSN 0004-6361.
- 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.
- "R Car". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-30.
- ^ 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.
- Cannon, Annie J. (1907), "Second catalogue of variable stars", Annals of Harvard College Observatory, 55: 1–94, Bibcode:1907AnHar..55....1C, retrieved 8 January 2025
- 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.
- 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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