Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-07
Astronomy and Astrophysics
Astrophysics
9 pages, 8 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20020911
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, $\ell$, 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 $\beta$ 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 $\ell>2$ acquire substantial $\ell\le2$ 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.
Daszy{ń}ska-Daszkiewicz Jadwiga
Dziembowski Wojciech A.
Goupil Marie Jo
Pamyatnykh Alexey A.
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