The University of Southampton
University of Southampton Institutional Repository

Neutron star asteroseismology: axial crust oscillations in the Cowling approximation

Neutron star asteroseismology: axial crust oscillations in the Cowling approximation
Neutron star asteroseismology: axial crust oscillations in the Cowling approximation
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.
0035-8711
256-268
Samuelsson, Lars
ce25b720-ee5b-4b1a-af84-c38a41399a62
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Samuelsson, Lars
ce25b720-ee5b-4b1a-af84-c38a41399a62
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304

Samuelsson, Lars and Andersson, Nils (2007) Neutron star asteroseismology: axial crust oscillations in the Cowling approximation. Monthly Notices of the Royal Astronomical Society, 374 (1), 256-268. (doi:10.1111/j.1365-2966.2006.11147.x).

Record type: Article

Abstract

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.

This record has no associated files available for download.

More information

Published date: January 2007

Identifiers

Local EPrints ID: 48198
URI: http://eprints.soton.ac.uk/id/eprint/48198
ISSN: 0035-8711
PURE UUID: 7ba2e5f3-a142-41ec-b88c-3f7204b76ade
ORCID for Nils Andersson: ORCID iD orcid.org/0000-0001-8550-3843

Catalogue record

Date deposited: 04 Sep 2007
Last modified: 28 Apr 2022 01:43

Export record

Altmetrics

Contributors

Author: Lars Samuelsson
Author: Nils Andersson ORCID iD

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×