EAS Publications Series

Stellar Evolution and Seismic Tools for Asteroseismology - Diffusive Processes in Stars and Seismic Analysis
C.W. Straka, Y. Lebreton and M.J.P.F.G. Monteiro (eds)
EAS Publications Series, 26 (2007) 129-136
DOI: 10.1051/eas:2007131

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

J. Daszynska-Daszkiewicz¹, W.A. Dziembowski^{2, 3} and A.A. Pamyatnykh^{3, 4}

¹ Instytut Astronomiczny, Uniwersytet Wroclawski. ul. Kopernika 11, Wroclaw, Poland
² Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
³ Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland
⁴ Institute of Astronomy, Pyatnitskaya Str. 48, 109017 Moscow, Russia

(Published online: 20 June 2007)

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 $M_\odot$ 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.