Normal Modes of Rotating Magnetic Stars

Details Normal Modes of Rotating Magnetic Stars Normal Modes of Rotating Magnetic Stars

2001-11-29

arxiv.org/abs/astro-ph/0111571v2

ApJ, 574, (2002), 908

Astronomy and Astrophysics

Astrophysics

21 pages, 2 figures, revised version to appear in v574 n2 pt1 ApJ August 1, 2002

Scientific paper

10.1086/341190

We investigate the effect of a magnetic field on the global oscillation modes of a rotating fluid star in the magnetohydrodynamic approximation. We present general equations for the modification of any type of fluid mode due to a general magnetic field which is not aligned with the star's spin axis. In the case of any internal dipole magnetic field we derive the equations for the frequency corrections to the r-modes. We solve for the frequency correction explicitly for the case when the internal dipole field is force-free, including the uniform density case. In the weak-field limit, the spatial form of the r-mode velocity perturbation is unchanged, but the magnitude of the frequency in the rotating frame increases.

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