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Pulsations in O Stars

Published online by Cambridge University Press:  12 April 2016

Hubertus F. Henrichs
Hubertus F. Henrichs*
Affiliation:
Astronomical Institute “Anton Pannekoek”, Univ. of Amsterdam, Kruislaan 403, 1098SJ Amsterdam, Netherlands

Abstract

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O stars are located in a domain of the HRD where nonradial pulsations are expected. Photometric surveys did not reveal pulsating O stars, showing that the amplitudes must be very small. Intensive spectroscopic studies yielded pulsation modes for very few O stars only, although many are line-profile variables. Wind contamination of many spectral lines is a major difficulty. Future concentrated spectroscopic efforts will undoubtedly increase the number of pulsating O stars.

The current status of our knowledge of pulsations in these stars is reviewed. From one specific example a critical attitude emerges towards the quantitative results reached so far. We also address the question whether non-radial pulsation can be the cause of the non-spherical time-dependent winds of these stars.

Type
Session V Pulsation
Information
International Astronomical Union Colloquium , Volume 169: Variable and Non-spherical Stellar Winds in Luminous Hot Stars , 1999 , pp. 305 - 311
Copyright
Copyright © Springer-Verlag 1999

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