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Title:
Overstable magnetic convection and the rapidly oscillating AP stars
Authors:
Cox, J. P.
Affiliation:
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 1, 1984, p. 220-227. (ApJ Homepage)
Publication Date:
05/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
A STARS, CONVECTION, MAGNETIC STARS, PECULIAR STARS, STELLAR OSCILLATIONS, ADIABATIC CONDITIONS, LORENTZ FORCE, MAGNETIC FLUX
DOI:
10.1086/161988
Bibliographic Code:
1984ApJ...280..220C

Abstract

Two analyses are presented of a mechanism recently suggested by Shibahashi to account for the oscillations of 'rapidly oscillating Ap stars'. This mechanism is based on overstable magnetic convection. A thin, super-adiabatic zone in the outer parts of a star pervaded by only a moderately strong magnetic field can lead to overstable oscillations. The periods of these oscillations are expected to be of the order of the observed periods. Moreover, these oscillations should have the magnetic axis as the pulsation axis. Growth times of these oscillations are short enough for them to be interesting. One of these analyses is based on a 'blob' model and is intended to be physically somewhat clear. The other is a local analysis and shows that the 'blob' model is essentially in agreement with this analysis.

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