Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-02
Astron.Astrophys. 423 (2004) 401-404
Astronomy and Astrophysics
Astrophysics
Accepted by Astron. & Astrophys., 4 pages, 4 figures
Scientific paper
10.1051/0004-6361:20035808
We ascribe the interpretation of the twin kilohertz Quasi Periodic Oscillations (kHz QPOs) of X-ray spectra of Low Mass X-Ray Binaries (LMXBs) to MHD Alfven wave oscillations in the different mass density regions of the accreted matter at the preferred radius, and the upper kHz QPO frequency coincides with the Keplerian frequency. The proposed model concludes that the kHz QPO frequencies depend inversely on the preferred radius, and that theoretical relation between the upper frequency ($\nt$) and the lower frequency ($\no$) is $\no \sim \nt^{2}$, which is similar to the measured empirical relation. The separation between the twin frequencies decreases (increases) with increasing kHz QPO frequency if the lower kHz QPO frequency is more (less) than $\sim$ 400 Hz.
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