RT Carinae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 44m 47.14715s[1] |
| Declination | −59° 24′ 48.1296″[1] |
| Apparent magnitude (V) | 8.36[2] (8.2 - 9.9[3]) |
| Characteristics | |
| Spectral type | M2 Ia[4] |
| B−V color index | +2.31[2] |
| Variable type | LC[3] |
| Astrometry | |
| Radial velocity (Rv) | −20.91[5] km/s |
| Proper motion (μ) | RA: −8.31[1] mas/yr Dec.: 2.30[1] mas/yr |
| Parallax (π) | 2.28 ± 1.03[1] mas |
| Distance | approx. 1,400 ly (approx. 400 pc) |
| Absolute magnitude (MV) | −6.74[2] |
| Details | |
| Radius | 1,090[2] R☉ |
| Luminosity (bolometric) | 200,000[2] L☉ |
| Surface gravity (log g) | −0.3[2] cgs |
| Temperature | 3,625[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
RT Carinae (HD 303310, HIP 52562, SAO 238424) is a variable star in the Carina Nebula in the constellation Carina. It has a mean apparent magnitude of +8.55.
RT Carinae is a red supergiant with a spectral type of M2I and has a temperature of 3625 K. With a diameter over a thousand times the Sun, it is one of the largest stars known. The luminosity is estimated between 180,000 and 220,000 times of the Sun, but, on average, it is 200,000. It is close to the open cluster Trumpler 15, but is not thought to be a member.[6] It appears to be surrounded by a dusty nebule, possibly material ejected from the star itself.[7]
It is catalogued as an irregular variable star, but a number of possible pulsation periods have been detected. Analysis from observations over 40 years give variations with periods of 201 and 448 days, with other studies suggesting periods of 100 and 1,400 days.[4]
References
- 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 4 5 6 7 Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal 628 (2): 973. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901.
- 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode:2009yCat....102025S.
- 1 2 Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society 372 (4): 1721. arXiv:astro-ph/0608438. Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x.
- ↑ Mermilliod, J. C.; Mayor, M.; Udry, S. (2008). "Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters". Astronomy and Astrophysics 485: 303. Bibcode:2008A&A...485..303M. doi:10.1051/0004-6361:200809664.
- ↑ Smith, Nathan (2006). "A census of the Carina Nebula - I. Cumulative energy input from massive stars". Monthly Notices of the Royal Astronomical Society 367 (2): 763. arXiv:astro-ph/0601060. Bibcode:2006MNRAS.367..763S. doi:10.1111/j.1365-2966.2006.10007.x.
- ↑ Forte, J. C.; Marraco, H. G. (1986). "RT Carinae; a late type supergiant within an elongated dusty nebula". Astrophysical Letters (ISSN 0004-6388) 25: 39. Bibcode:1986ApL....25...39F.
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