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AG Carinae and the WR Phenomenon in Luminous Blue Variables

Published online by Cambridge University Press:  03 August 2017

R. Viotti ,
G. B. Baratta ,
C. Rossi  and
A. di Fazio
R. Viotti
Affiliation:
1Istituto Astrofisica Spaziale (CNR), Via E. Fermi 21, 00044 Frascati RM, Italy
G. B. Baratta
Affiliation:
2Osservatorio Astronomico, Viale del Parco Meilini 84, 00136 Roma
C. Rossi
Affiliation:
3Istituto Astronomico, Università La Sapienza, Via Lancisi 29, 00161 Roma
A. di Fazio
Affiliation:
3Istituto Astronomico, Università La Sapienza, Via Lancisi 29, 00161 Roma

Abstract

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AG Car is a Luminous Blue Variable which recently evolved from AIe to Ofpe/WN9 in four years at about constant bolometric luminosity, while in the visual the star faded by two magnitudes. This change is probably associated with variable opacity of an unstable massive expanding envelope of a hot star. We discuss the main spectral features of the star and of its ring nebula, and the spectral variations.

Type
Session VII. Evolution
Information
Symposium - International Astronomical Union , Volume 143: Wolf–Rayet Stars and Interrelations with other Massive Stars in Galaxies , 1991 , pp. 499 - 504
Copyright
Copyright © Kluwer 1991 

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