Paper:	Magnetic Oscillations in Radiative Stars
Volume:	203, The Impact of Large-Scale Surveys on Pulsating Star Research, IAU Colloquium 176
Page:	386
Authors:	Zita, E. J.
Abstract:	What drives acoustic modes in magnetic, radiative stars, such as the rapidly oscillating Ap (roAp) stars? We propose that oscillations in the shape of the magnetic field can drive magnetosonic waves, which are observed as p modes. The force-free atmosphere minimizes magnetic energy. If the field is strong enough, the magnetic configuration can oscillate about its equilibrium state. Initial calculations showed that the wavenumbers, frequencies, and available energy are consistent with observations of roAp stars (Zita 1997). We present the results of new calculations and proposed tests of our model. We also discuss the resultant < v × b> dynamo, which may shed light on observations in B stars.

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