Luminous Blue Variables and Hypergiants -- the Evidence for High Mass Loss Events

Roberta Humphreys

University of Minnesota, USA

Mass loss from massive stars is common. It plays an important role in the evolution of stars above about 20 Msun. 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, the possible origin of these episodes, and their importance in the final stages of massive star evolution.

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