AG Car (2MASS)
Epoch J2000 Equinox J2000
|Right ascension||10h 56m 11.57699s|
|Declination||−60° 27′ 12.8056″|
|Apparent magnitude (V)||6.96|
|U−B color index||–0.58|
|B−V color index||+0.61|
|Proper motion (μ)||RA: −5.89 mas/yr
Dec.: +2.45 mas/yr
|Luminosity||1.5 × 106 L☉|
|Rotation||13 ± 2|
|Rotational velocity (v sin i)||220 ± 50 km/s|
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.
Hubble Space Telescope image
- 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
- 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.
- 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
- 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
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