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Light and Radial Velocity Variations Due to Low-FrequencyOscillations in Rotating Stars

Published online by Cambridge University Press:  20 June 2007

C.W. Straka ,
Y. Lebreton ,
M.J.P.F.G. Monteiro ,
J. Daszyńska-Daszkiewicz ,
W.A. Dziembowski  and
A.A. Pamyatnykh
J. Daszyńska-Daszkiewicz
Affiliation:
Instytut Astronomiczny, Uniwersytet Wrocławski. ul. Kopernika 11, Wrocław, Poland
W.A. Dziembowski
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland
A.A. Pamyatnykh
Affiliation:
Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland Institute of Astronomy, Pyatnitskaya Str. 48, 109017 Moscow, Russia
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Abstract

Low-frequency oscillations are unstable in a wide range of stellar models and have been detected in a number of B-type stars. For such modes, even a moderate rotation significantly affects amplitude distribution over stellar surface and hence their visibility conditions. Adopting the traditional approximation, we study effects of rotation on relative amplitudes in photometric passbands and in radial velocity. We present numerical results for unstable modes in a selected stellar model of a 6 M๏ main sequence star. The goal is to show how observable amplitudes, which are tools for mode identification, depend on the rotation rate and on the aspect angle.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 26: Stellar Evolution and Seismic Tools for Asteroseismology - Diffusive Processes in Stars and Seismic Analysis , 2007 , pp. 129 - 136
Copyright
© EAS, EDP Sciences, 2007

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