Axisymmetric spherical harmonic decomposition of the pulsation modes in rapidly oscillating AP stars.
Abstract
Several of the rapidly oscillating Ap stars have frequency spectra which show frequency triplets split exactly equally by the rotation frequency of the star. Recently, one of these stars, HR 3831, has been found to have an equally split frequency septuplet. None of those frequency multiplets can be described adequately by a single spherical harmonic pulsation mode. In this paper a method is presented for modeling the observed frequency spectrum of a rapidly oscillating Ap star as a sum of axisymmetric spherical harmonics of low degree within the assumptions of the oblique pulsator model. It is shown that such a sum with l not greater than 3 is sufficient to describe the observations.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 December 1992
 DOI:
 10.1093/mnras/259.4.701
 Bibcode:
 1992MNRAS.259..701K
 Keywords:

 A Stars;
 Peculiar Stars;
 Spherical Harmonics;
 Stellar Oscillations;
 Stellar Rotation;
 Computational Astrophysics;
 Stellar Models;
 Vibration Mode;
 Astrophysics