Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-01-04
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
6 pages, 4 figures, accepted by AN
Scientific paper
Using the recently published data of twin kHz quasi-period oscillations (QPOs) in neutron star low-mass X-ray binaries (LMXBs), we study the different profiles between bright Z sources and less luminous Atoll sources in a statistical way. We find the quality factors of upper kHz QPOs show a narrow distribution both for Z sources and Atoll sources, which concentrate at 7.98 and 9.75 respectively, the quality factors of lower kHz QPOs show a narrow distribution for Z sources and a broader distribution for Atoll sources, which concentrate at 5.25 and 86.22 respectively. In order to investigate the relation between the quality factor and the peakfrequency of kHz QPOs, we fit the data with power-law, linear and exponential functions, respectively. There is an obvious trend that the quality factors increase with the peak frequencies both for upper and lower QPOs. The implications of our results are discussed.
Chang Hsiang Kuang
Chen Leon L.
Wang H.-D.
Wang Jing
Zhang Cheng-Min
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