Volume 528, April 2011
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||14 March 2011|
A model for the upper kHz QPO coherence of an accreting neutron star
1 National Astronomical Observatories,
Chinese Academy of Sciences 100012 Beijing PR China
e-mail: firstname.lastname@example.org; email@example.com
2 Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, 100084 Beijing, PR China
3 School of Space Science and Physics, Shandong University, 264209 Weihai, PR China
4 Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, PR China
Received: 1 December 2010
Accepted: 23 January 2011
We investigate the coherence of the twin kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binary (LMXB) theoretically. The profile of upper kHz QPO, interpreted as Keplerian frequency, is ascribed to the radial extent of the kHz QPO emission region associated with the transitional layer at the magnetosphere-disc boundary, which corresponds to the coherence of upper kHz QPO. The theoretical model for the Q-factor of upper kHz QPO is applied to the observational data of five Atoll and five Z sources, and the consistence is implied.
Key words: accretion: accretion disks / stars: neutron / binaries: close / X-rays: binaries
© ESO, 2011
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