Neutron Star Asteroseismology. Axial Crust Oscillations in the Cowling Approximation
| dc.creator | Samuelsson, Lars | |
| dc.creator | Andersson, Nils | |
| dc.date | 2006-09-10 | |
| dc.date | 2006-10-17 | |
| dc.date.accessioned | 2026-07-07T10:23:35Z | |
| dc.date.available | 2026-07-07T10:23:35Z | |
| dc.description | Recent observations of quasi-periodic oscillations in the aftermath of giant flares in soft gamma-ray repeaters suggest a close coupling between the seismic motion of the crust after a major quake and the modes of oscillations in a magnetar. In this paper we consider the purely elastic modes of oscillation in the crust of a neutron star in the relativistic Cowling approximation (disregarding any magnetic field). We determine the axial crust modes for a large set of stellar models, using a state-of-the-art crust equation of state and a wide range of core masses and radii. We also devise useful approximate formulae for the mode-frequencies. We show that the relative crust thickness is well described by a function of the compactness of the star and a parameter describing the compressibility of the crust only. Considering the observational data for SGR 1900+14 and SGR 1806-20, we demonstrate how our results can be used to constrain the mass and radius of an oscillating neutron star. | |
| dc.description | 14 pages, 1 table, 4 figures. v2: Typos corrected, references added and a bug in the code was fixed which slightly modifies the figures but leaves the conclusions unchanged | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0609265 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0609265 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.374:256-268,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2006.11147.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/175885 | |
| dc.subject | Astrophysics | |
| dc.title | Neutron Star Asteroseismology. Axial Crust Oscillations in the Cowling Approximation | |
| dc.type | text |