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Distribution of twin kHz QPOs in LMXBs

Published online by Cambridge University Press:  21 February 2013

D. H. Wang  and
L. Chen
D. H. Wang
Affiliation:
Astronomy Department, Beijing Normal University, Beijing 100875, China email: huazai05105220@163.com
L. Chen
Affiliation:
Astronomy Department, Beijing Normal University, Beijing 100875, China email: huazai05105220@163.com
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Abstract

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With kilohertz quasi-periodic oscillation (kHz QPO) sources in neutron star low mass X-ray binaries (NS-LMXBs) published up to now, we analyze the centroid frequency (ν) distribution of twin kHz QPOs. We find that Atoll and Z sources show the similar distributions of ν1 and ν2, which indicate that twin kHz QPOs may be the common property of NS-LXMBs and have the similar physical origins. The mean values of ν1 and ν2 in Atoll sources are higher than those in Z sources, and we consider that this may because the QPO signals are sheltered by the thicken accretion disk or corona in Z sources. The maximums of ν2 in both Atoll and Z sources are the same order as the Keplerian orbital frequency of the NS surface, so kHz QPOs could occur near the NS surface.

Keywords

X-rays: binariesstars: neutronaccretionaccretion disks
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 327 - 328
Copyright
Copyright © International Astronomical Union 2013

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