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GR: Fachverband Gravitation und Relativitätstheorie

GR 12: Relativistische Astrophysik

GR 12.2: Talk

Thursday, March 31, 2011, 18:05–18:25, 20.40: 101

On magnetars QPOs — Antonella Colaiuda and •Kostas Kokkotas — Universität Tübingen, Auf der Morgenstelle 10 C, 72076 Tübingen

We study axisymmetric perturbations of neutron star 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 in the crust and a continuum in the core, while we also discover a class of ``discrete Alfvén modes''. 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 constrains on the mass, radius and crust thickness of the two magnetars.