2008/03/17 by Shoji Kato · 38 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Dimensionless quantity #Excited state #Nonlinear system #Order (exchange) #Pulsars and Gravitational Waves Research #Spin (aerodynamics) #Stars #astro-ph
paper · pdf · doi:10.1093/pasj/60.4.889
published in Publications of the Astronomical Society of Japan 60(4), 889-897 (Oxford University Press) · 18 pages, 9 figures, to be published in PASJ Vol. 60 (2008),No 4 (August)
arxiv created 2008/03/17 · openalex publication_date 2008/08/25 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In previous papers, we have proposed a model in which the high-frequency quasi-periodic oscillations (HF QPOs) observed in black-hole and neutron-star X-ray binaries are inertial-acoustic oscillations that are resonantly excited on a one-armed deformed disk by nonlinear couplings between the oscillations and the disk deformation. In this paper we show that in addition to the inertial-acoustic waves, one-armed corrugation waves are also excited in the deformed disks. They are low-frequency oscillations. We examine the frequencies and their correlations among the inertial-acoustic oscillations and the corrugation waves that are excited, in order to know whether they can describe the observed frequency correlations among kHz QPOs and low-frequency QPOs (LF QPOs) in neutron-star X-ray binaries. The results seem to well describe the observed correlations in Cir X-1, if we adopt M= 1.5–2.0M_\odot and a_* ∼ 0.8, where M is the mass of the central star and a_* is a dimensionless spin parameter of the metric. Finally, assumptions involved in this disk-oscillation model are briefly summarized and discussed.