Abstract
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.
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Henrichs, H.F. (1999). Pulsations in O stars. In: Wolf, B., Stahl, O., Fullerton, A.W. (eds) Variable and Non-spherical Stellar Winds in Luminous Hot Stars. Lecture Notes in Physics, vol 523. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0106395
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DOI: https://doi.org/10.1007/BFb0106395
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