Journal Article

Coupled polar–axial magnetar oscillations

A. Colaiuda and K. D. Kokkotas

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 1, pages 811-821
Published in print June 2012 | ISSN: 0035-8711
Published online May 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20919.x
Coupled polar–axial magnetar oscillations

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We study coupled axial and polar axisymmetric oscillations of a neutron star endowed with a strong magnetic field, having both poloidal and toroidal components. The toroidal component of the magnetic field is driving the coupling between the polar and axial oscillations. The star is composed of a fluid core as well as a solid crust. Using a two-dimensional general relativistic simulation and a magnetic field B= 1016 G, we study the change in the polar and axial spectrum caused by the coupling. We find that the axial spectrum suffers a dramatic change in its nature, losing its continuum character. In fact, we find that only the ‘edges’ of the continua survive, generating a discrete spectrum. As a consequence the crustal frequencies, which in our previous simulation could be absorbed by the continua, if they were embedded inside it, are now long-living oscillations. They may lose their energy only in the very special case that they are in resonance with the ‘edges’ of the continua.

Keywords: MHD; stars: magnetic field; stars: neutron; stars: oscillations

Journal Article.  5194 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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