Journal Article

Oscillations of relativistic axisymmetric tori and implications for modelling kHz-QPOs in neutron star X-ray binaries

P. J. Montero and O. Zanotti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 2, pages 1507-1514
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19806.x
Oscillations of relativistic axisymmetric tori and implications for modelling kHz-QPOs in neutron star X-ray binaries

More Like This

Show all results sharing this subject:

  • Astronomy and Astrophysics

GO

Show Summary Details

Preview

We perform a global linear perturbative analysis and investigate oscillation properties of relativistic, non-self-gravitating tori orbiting around neutron stars in the slow rotation limit approximation. Extending the work done in Schwarzschild and Kerr backgrounds, we consider the axisymmetric oscillations of vertically integrated tori in the Hartle–Thorne space–time. The equilibrium models are constructed by selecting a number of different non-Keplerian distributions of specific angular momentum, allowing for disc sizes L∼ 0.5–600 gravitational radii. Our results, obtained after solving a global eigenvalue problem to compute the axisymmetric p-modes, indicate that such oscillation modes could account for most observed lower (νL) and upper (νU) high-frequency quasi-periodic oscillations for Sco X-1, and for some Z and Atoll sources with νL≳ 500 Hz. However, when νL≲ 500 Hz, p-mode oscillations do not account for the linear relation νU=AνL+B, B≠ 0, between the upper and lower high-frequency quasi-periodic oscillations that are observed in neutron star low-mass X-ray binaries.

Keywords: stars: neutron; X-rays: binaries

Journal Article.  5901 words.  Illustrated.

Subjects: Astronomy and Astrophysics

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.