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Non-Radial Pulsations in the Extreme Helium Star HD 160641

Published online by Cambridge University Press:  12 April 2016

A.E. Lynas-Gray ,
D. Kilkenny ,
I. Skillen  and
C.S. Jeffery
A.E. Lynas-Gray
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, England.
D. Kilkenny
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory, 7935 Cape Town, South Africa.
I. Skillen
Affiliation:
University Observatory, Buchanan Gardens, St. Andrews, Pife, Scotland.
C.S. Jeffery
Affiliation:
University Observatory, Buchanan Gardens, St. Andrews, Pife, Scotland.

Abstract

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Simultaneous radial velocity and photometric observations are reported for the variable extreme helium star HD 160641. Pulsation in the 1 - 4 mode could explain the observed variations; the corresponding Wesselink radius would be 8 ± 2 R⊙. The consequent luminosity of log (L/L⊙) - 4.8 ± 0.2 would be consistent with Schonberner's evolutionary model for a lM⊙ extreme helium star.

Type
III Hot Extreme Helium Stars
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 87 - 93
Copyright
Copyright © Reidel 1986

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