Theoretical Clues for Mode Identification - Instability Ranges and Rotational Splitting Patterns |
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Authors: | AA Pamyatnykh |
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Institution: | (1) Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland;(2) Russian Academy of Sciences, Institute of Astronomy, Pyatnitskaya Str. 48, 109017 Moscow, Russia;(3) Institute of Astronomy, University of Vienna, Türkenschanzstr. 17, A-1180 Vienna, Austria |
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Abstract: | Frequency spectra of unstable modes for typical models of Cephei, SPBand Scuti variables are presented. Comparison of theoretical andobserved instability ranges allows to constrain possible parameters of thestellar models. As an example, models of 2 Tau are considered. Mainuncertainties in the determination of the theoretical frequency ranges for Sct variables are due to unsatisfactory treatment of convection.The structure of rotationally split multiplets for the low-order modesexcited in Sct stars is discussed. The rotational coupling betweenclose modes of spherical harmonic degree, , differing by 2, cansignificantly disturb the frequency spectrum. |
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Keywords: | stellar oscillations instability ranges rotational splitting |
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