Volume 392, Number 1, September II 2002
|Page(s)||151 - 159|
|Section||Interstellar and circumstellar matter|
|Published online||22 August 2002|
Photometric amplitudes and phases of nonradial oscillation in rotating stars
Astronomical Institute of the Wrocław University, ul. Kopernika 11, 51-622 Wrocław, Poland
2 Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
3 Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
4 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya Str. 48, 109017 Moscow, Russia
5 DASGAL, UMR CNRS 8633, Observatoire de Paris-Meudon, France
Corresponding author: J. Daszyńska-Daszkiewicz, email@example.com
Accepted: 11 June 2002
Effects of rotational mode coupling on photometric parameters of stellar oscillations are studied. At moderate rotation rates, a strong coupling between modes of spherical harmonic degree, , differing by 2 and of the same azimuthal order, m, takes place if the frequencies are close. This is a common situation amongst main sequence pulsators. Numerical results for a sequence of β Cephei star models are reported for the two- and three-mode couplings. One consequence of mode coupling is that modes of higher degree should be considered in photometric mode identification. Modes with nominal degree acquire substantial components and therefore are more likely to reach detectable amplitudes. Coupled mode positions in the amplitude ratio – phase difference diagrams, based on multicolour photometry, become both aspect- and m-dependent. Examples of the mode path in the diagram with varying aspect are given. The diagrams remain a useful tool for mode identification in rotating stars but the tool must be used with care.
Key words: stars: β Cephei variables / stars: oscillation / stars: rotation
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.