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Evolutionary Helium and CNO Anomalies in the Atmospheres and Winds of Massive Hot Stars

Published online by Cambridge University Press:  12 April 2016

Nolan R. Walborn*
Affiliation:
Space Telescope Science Institute, * 3700 San Martin Drive Baltimore, Maryland 21218

Abstract

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The ubiquitous evidence for processed material in the atmospheres, winds, and circumstellar ejecta of massive stars will be reviewed. A broad array of normal and peculiar evolutionary stages is considered, up to and including Type II supernova progenitors. The quantitative analysis of these spectra is difficult, and until recently for the most part only qualitative or approximate results have been available. However, several important current programs promise reliable abundance determinations, which will enable detailed comparisons with recent evolutionary calculations. A significant emerging result is that the morphologically normal majority of both hot and cool supergiants may already display an admixture of CNO-cycle products in their atmospheres. It may become possible in this way to identify blue supergiants returning from the red supergiant region, as appears to have been the case for the SN 1987A progenitor.

Type
Part I. Chemical Peculiarities as Probe of Stellar Evolution
Copyright
Copyright © Springer-Verlag 1988

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