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Evolution of Massive Stars: When Does an of Star Become a WR Star?

Published online by Cambridge University Press:  14 August 2015

Peter S. Conti
Peter S. Conti*
Affiliation:
Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards

Extract

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Detailed spectroscopic work has begun for several stars that have been classified WN 7. All show absorption lines in the upper Balmer series and in ionized helium. The absolute magnitudes, established from cluster membership, are relatively brighter than those of most other WR stars. In this paper the outflow velocity near the stellar photosphere is shown to be similar to that in Of stars. These WN 7 stars show somewhat larger emission line widths and probably have less hydrogen in their envelopes, but otherwise have similar luminosities and temperatures as Of stars.

Type
Part VII: Theoretical Papers and Summary
Information
Symposium - International Astronomical Union , Volume 80: The HR Diagram , 1978 , pp. 369 - 374
Copyright
Copyright © Reidel 1978 

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