The correlations between the twin kHz quasi-periodic oscillation frequencies of low-mass X-ray binaries

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∼νb2...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2006-03, Vol.366 (4), p.1373-1377
Main Authors: Zhang, C. M., Yin, H. X., Zhao, Y. H., Zhang, F., Song, L. M.
Format: Article
Language:English
Subjects:
accretion
accretion discs
accretion, accretion discs
Astronomy
binaries: close
Double stars
Earth, ocean, space
Exact sciences and technology
stars: neutron
X-ray astronomy
X-rays: stars
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Summary: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∼νb2 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.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2006.09920.x