Frequency spectrum of toroidal Alfvén mode in a neutron star with Ferraro's form of nonhomogeneous poloidal magnetic field
arXiv:0902.0840 · doi:10.1007/s10509-009-0069-8
Abstract
Using the energy variational method of magneto-solid-mechanical theory of a perfectly conducting elastic medium threaded by magnetic field, the frequency spectrum of Lorentz-force-driven global torsional nodeless vibrations of a neutron star with Ferraro's form of axisymmetric poloidal nonhomogeneous internal and dipole-like external magnetic field is obtained and compared with that for this toroidal Alfvén mode in a neutron star with homogeneous internal and dipolar external magnetic field. The relevance of considered asteroseismic models to quasi-periodic oscillations of the X-ray flux during the ultra powerful outbursts of SGR 1806-20 and SGR 1900+14 is discussed.
Accepted for publication in Astrophysics & Space Science
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- Alfven node-free vibrations of white dwarf in the model of solid star with toroidal magnetic field
- Non-axisymmetric low frequency oscillations of rotating and magnetized neutron stars
- Pulsating magneto-dipole radiation of a quaking neutron star powered by energy of Alfven seismic vibrations