The correlations between the twin kHz quasi-periodic oscillation frequencies of low-mass X-ray binaries |
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| Authors: | C M Zhang H X Yin Y H Zhao F Zhang L M Song |
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| Institution: | National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Astronomical Institute, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | We analyzed the recently published kHz quasi-period oscillaiton (QPO) data in the neutron star low-mass X-ray binaries (LMXBs), in order to investigate the different correlations of the twin-peak kHz QPOs in bright Z sources and in the less luminous Atoll sources. We find a power-law relation ν1～ν b 2 between the upper and the lower kHz QPOs with different indices: b ? 1.5 for the Atoll source 4U 1728-34 and b ? 1.9 for the Z source Sco X-1. The implications of our results for the theoretical models for kHz QPOs are discussed. |
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| Keywords: | accretion accretion discs binaries: close stars: neutron X-rays: stars |
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