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Paper: The Origin of Rosette-Modes in Rotating Star Oscillations
Volume: 479, Progress in Physics of the Sun and Stars
Page: 539
Authors: Takata, M.; Saio, H.
Abstract: We analyse unique axisymmetric eigenmodes of oscillation in rigidly rotating stars, which have recently been discovered in the frequency region of low-order gravity-modes of the polytropic model with Index 3, and named rosette-modes after their eigenfunction structure. We demonstrate that rosette-modes appear in the presence of slow rotation due to close degeneracy in the frequency among several eigenmodes. Regarding the effect of the Coriolis force on stellar oscillations as a small perturbation, and applying the quasi-degenerate perturbation theory, we can successfully reproduce the structure of rosette-modes as a linear combination of several unperturbed eigenmodes, which have successive spherical degrees of the same parity. In this paper, we discuss characteristics of rosette-modes in a 5 M Zero Age Main Sequence model.
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