Alfvén polar oscillations of relativistic stars
Hajime SotaniTheoretical Astrophysics, Eberhard-Karls University of Tübingen, 72076 Tübingen, GermanyKostas D. KokkotasDepartment of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
2009en
ABI
Abstract
We study polar Alfvén oscillations of relativistic stars endowed with a strong global poloidal dipole magnetic field. Here, we focus only on the axisymmetric oscillations which are studied by numerically evolving the two-dimensional perturbation equations. Our study shows that the spectrum of the polar Alfvén oscillations is discrete in contrast to the spectrum of axial Alfvén oscillations which is continuous. We also show that the typical fluid modes, such as the f and p modes, are not significantly affected by the presence of the strong magnetic field.
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