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

J. Daszyńska-Daszkiewicz; W.A. Dziembowski; A.A. Pamyatnykh

doi:10.1051/eas:2007131

All issues

Volume 26 (2007)

EAS Publications Series, 26 (2007) 129-136

Abstract

Issue		EAS Publications Series Volume 26, 2007 Stellar Evolution and Seismic Tools for Asteroseismology - Diffusive Processes in Stars and Seismic Analysis


Page(s)		129 - 136
DOI		https://doi.org/10.1051/eas:2007131
Published online		20 June 2007

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

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

J. Daszyńska-Daszkiewicz¹, W.A. Dziembowski²^,3 and A.A. Pamyatnykh³^,4

¹ Instytut Astronomiczny, Uniwersytet Wrocławski. ul. Kopernika 11, Wrocław, 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

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.