Journal Article

Oscillations of rapidly rotating stratified neutron stars

A. Passamonti, B. Haskell, N. Andersson, D. I. Jones and I. Hawke

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 2, pages 730-741
Published in print April 2009 | ISSN: 0035-8711
Published online March 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14408.x
Oscillations of rapidly rotating stratified neutron stars

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We use time evolutions of the linear perturbation equations to study the oscillations of rapidly rotating neutrons stars. Our models account for the buoyancy due to composition gradients and we study, for the first time, the nature of the resultant g modes in a fast spinning star. We provide detailed comparisons of non-stratified and stratified models. This leads to an improved understanding of the relationship between the inertial modes of a non-stratified star and the g modes of a stratified system. In particular, we demonstrate that each g mode becomes rotation dominated, i.e. approaches a particular inertial mode, as the rotation rate of the star is increased. We also discuss issues relating to the gravitational wave driven instability of the various classes of oscillation modes.

Keywords: methods: numerical; stars: neutron; stars: oscillation; stars: rotation

Journal Article.  8985 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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