Oscillations of rapidly rotating stratified neutron stars

Details Oscillations of rapidly rotating stratified neutron stars Oscillations of rapidly rotating stratified neutron stars

2008-07-22

arxiv.org/abs/0807.3457v3

Astronomy and Astrophysics

Astrophysics

16 pages, 12 figures, 4 tables, corrected Table 1

Scientific paper

10.1111/j.1365-2966.2009.14408.x

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.

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