The nature of the luminous blue variable AG carinae |
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| Authors: | R Viotti A Cassatella V F Polcaro G B Baratta A Damineli Neto C Rossi M Barylak |
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| Institution: | (1) Istituto di Astrofisica Spaziale, CNR, Via Enrico Fermi 21, 00044 Frascati, Italy;(2) Osservatorio Astronomico, Via del Parco Mellini 84, 00136 Roma;(3) Instituto Astronomico e Geofsico da USP, Av. Miguel Stefano, 4200 Sao Paulo, Brazil;(4) Istituto Astronomico, Universita La Sapienza, Via Lancisi 29, 00161 Roma;(5) IUE Observatory, Villafranca Statellite Tracking Station, 28080 Madrid, Spain |
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| Abstract: | After many years of permanence at minimum, the luminous blue variable AG Car started in mid 1990 a new brightening phase. We review the spectroscopic variations of the star since 1949, and discuss the nature of the circumstellar nebula. We give evidence that, like in  Car, also in AG Car dust is continuously condensing from the stellar wind. We suggest that the star could be partially reddened by the circumstellar dust, which could affect the estimates of the stellar distance. An extended HII
halo is present outside the ring nebula, which should be associated with the wind of a previous cooler evolutionary stage of AG Car. |
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| Keywords: | AG Car Luminous blue variables Dust envelope Stellar wind |
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