English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In previous papers, we have proposed a model that the high-frequencyquasi-periodic oscillations (HF QPOs) observed in black-hole and neutron-starX-ray binaries are inertial-acoustic oscillations that are resonantly excitedon a one-armed deformed disk by nonlinear couplings between the oscillationsand the disk deformation. In this paper we show that in addition to theinertial-acoustic waves, one-armed corrugation waves are also excited in thedeformed disks. They are low-frequency oscillations. We examine frequencies andtheir correlations among the inertial-acoustic oscillations and the corrugationwaves that are excited, in order to know whether they can describe observedfrequency correlations among kHz QPOs and low-frequency QPOs (LF QPOs) inneutron-star X-ray binaries. The results seem to well describe the observedcorrelations in Cir X-1, if we adopt $M= 1.5\sim 2.0 M_\odot$ and $a_* \sim0.8$, where $M$ is the mass of the central star and $a_*$ is the dimensionlessspin parameter of the metric. Finally, assumptions involved in thisdisk-oscillation model are briefly summarized and discussed.

Frequency Correlation of QPOs Based on a Resonantly-Excited Disk-Oscillation Model