LBVs, hypergiants and impostors — the evidence for high mass loss events

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Humphreys, Roberta M.^1

Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis

MN, United States^1

关键词: AGB stars;    Mass loss;    Massive stars;    Radiation pressure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/2/022007/pdf
DOI  :  10.1088/1742-6596/728/2/022007

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Mass loss from massive stars is common. It plays an important role in the evolution of stars above about 20 Mo. In the massive hot stars the winds and mass loss are driven by radiation pressure on the lines. The mass loss mechanism in post-main sequence red supergiants is still debated but pulsation and convection play a role. In this short talk, I am emphasizing the evidence for high mass loss episodes in evolved massive stars with specific examples such as VY CMa, IRC +10420 and the giant eruptions of LBVs, the possible origin of these episodes, and their importance in the final stages of massive star evolution. By analogy with the less massive AGB stars, I suggest that VY CMa is a candidate for a second red supergiant stage.