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

We ascribe the interpretation of the twin kilohertz Quasi PeriodicOscillations (kHz QPOs) of X-ray spectra of Low Mass X-Ray Binaries (LMXBs) toMHD Alfven wave oscillations in the different mass density regions of theaccreted matter at the preferred radius, and the upper kHz QPO frequencycoincides with the Keplerian frequency. The proposed model concludes that thekHz QPO frequencies depend inversely on the preferred radius, and thattheoretical relation between the upper frequency ($\nt$) and the lowerfrequency ($\no$) is $\no \sim \nt^{2}$, which is similar to the measuredempirical relation. The separation between the twin frequencies decreases(increases) with increasing kHz QPO frequency if the lower kHz QPO frequency ismore (less) than $\sim$ 400 Hz.Comment: Accepted by Astron. & Astrophys., 4 pages, 4 figure

The MHD Alfven wave oscillation model of kHz Quasi Periodic Oscillations of Accreting X-ray binaries