Journal Article

Magnetar oscillations in the presence of a crust

A. Colaiuda and K. D. Kokkotas

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 4, pages 3014-3022
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18602.x
Magnetar oscillations in the presence of a crust

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We study the axisymmetric perturbations of neutron stars endowed with a strong magnetic field (magnetars), considering the coupled oscillations of the fluid core with the solid crust. We recover discrete oscillations based mainly on the crust and a continuum in the core. We also confirm the presence of ‘discrete Alfvén modes’ in the gap between two contiguous continua and, in addition, we can resolve some of them also inside the continua. Our results can explain both the lower and the higher observed quasi-periodical oscillations (QPOs) in SGR 1806−20 and SGR 1900+14 and put constraints on the mass, radius and crust thickness of the two magnetars.

Keywords: asteroseismology; MHD; stars: magnetic field; stars: neutron; stars: oscillations; gamma rays: general

Journal Article.  5970 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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