How to drive roAp stars

Details How to drive roAp stars How to drive roAp stars

1998-06-22

arxiv.org/abs/astro-ph/9806290v1

Astronomy and Astrophysics

Astrophysics

11 pages, 15 figures, to be published in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01960.x

Rapidly oscillating Ap stars consitute a unique class of pulsators to study nonradial oscillations under some - even for stars - unusual physical conditions. These stars are chemically peculiar, they have strong magnetic fields, and they often pulsate in several high-order acoustic modes simultaneously. We discuss here an excitation mechanism for short-period oscillation modes based on the classical kappa mechanism. We particularly stress the conditions that must be fulfilled for successful driving. Specifically, we discuss the roles of chemical peculiarity and strong magnetic field on the oscillation modes and what separates these pulsators from delta Scuti and Am-type stars.

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