AG Carinae
AG Car (2MASS) | |
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Carina |
Right ascension | 10h 56m 11.57699s[1] |
Declination | −60° 27′ 12.8056″[1] |
Apparent magnitude (V) | 6.96[2] |
Characteristics | |
Spectral type | LBV |
U−B color index | –0.58[2] |
B−V color index | +0.61[2] |
Variable type | LBV[3] |
Astrometry | |
Proper motion (μ) | RA: −5.89[1] mas/yr Dec.: +2.45[1] mas/yr |
Distance | 4,364[4] ly (1,338 pc) |
Details | |
Mass | 70[3] M☉ |
Radius | 62[3] R☉ |
Luminosity | 1.5 × 106[3] L☉ |
Temperature | 17,000–22,800[3] K |
Rotation | 13 ± 2[3] |
Rotational velocity (v sin i) | 220 ± 50[3] km/s |
Other designations | |
AG Carinae (AG Car) is a star in the constellation Carina. It is classified as a luminous blue variable and is one of the most luminous stars in the Milky Way. The large distance (20,000 light-years) and intervening dust mean that the star is not visible to the naked eye; its apparent brightness varies irregularly between 5.7m and 9.0m. The star is surrounded by a large planetary nebula, formed by material expulsed from the star by its powerful stellar wind. The star is apparently in a transitional phase between a massive class O blue supergiant and a Wolf-Rayet star, and the spectral type varies between WN11 at visual minimum and an early A hypergiant at maximum.
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AAVSO light curve of luminous blue variable AG Car from 1 Jan 1940 to 23 Nov 2010. Up is brighter and down is fainter. Day numbers are Julian day.
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Hubble Space Telescope image
References
- ↑ 1.0 1.1 1.2 1.3 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
- ↑ 2.0 2.1 2.2 Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series 34: 1–49. Bibcode:1978A&AS...34....1N.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Groh, J. H.; Hillier, D. J.; Damineli, A. (July 2011), "On the Nature of the Prototype Luminous Blue Variable AG Carinae. II. Witnessing a Massive Star Evolving Close to the Eddington and Bistability Limits", The Astrophysical Journal 736 (1), arXiv:1105.0814, Bibcode:2011ApJ...736...46G, doi:10.1088/0004-637X/736/1/46
- ↑ Stanghellini, Letizia; Shaw, Richard A.; Villaver, Eva (December 2008), "The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale", The Astrophysical Journal 689 (1): 194–202, arXiv:0807.1129, Bibcode:2008ApJ...689..194S, doi:10.1086/592395
External links
- Samus, N. N.; Durlevich, O. V.; et al. (2004). "Combined General Catalogue of Variable Stars (GCVS4.2)". Archived from the original on 23 November 2006. Retrieved 2007-01-04.
- 2MASS Atlas Image Gallery: Miscellaneous Objects — includes an infrared image of AG Carinae
- http://jumk.de/astronomie/big-stars/ag-carinae.shtml
- Simbad
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