A Study on the Correlations between the Twin kHz QPO Frequencies in Sco X-1

For the bright neutron star low-mass X-ray binary Sco X-1, we analyzed all updated frequencies of the twin kilohertz quasi-periodic oscillations (kHz QPOs), their correlations and distributions. We found that the frequency separation of the kHz QPO peaks appears not to be a constant, rather, it decr...

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Bibliographic Details
Published in:Chinese journal of astronomy and astrophysics 2005-12, Vol.5 (6), p.595-600
Main Authors: Yin, Hong-Xing, Zhang, Cheng-Min, Zhao, Yong-Heng, Song, Li-Ming, Zhang, Fan
Format: Article
Language:English
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Summary:For the bright neutron star low-mass X-ray binary Sco X-1, we analyzed all updated frequencies of the twin kilohertz quasi-periodic oscillations (kHz QPOs), their correlations and distributions. We found that the frequency separation of the kHz QPO peaks appears not to be a constant, rather, it decreases with increasing inferred mass accretion rate. We show that the currently available data of Sco X-1 by Rossi X-ray Timing Explorer are inconsistent with the proposals of the beat model that the frequency separation is a constant. Our conclusions are consistent with those of some previous researchers and we discuss further implications for the kilohertz QPO models.
ISSN:1009-9271
DOI:10.1088/1009-9271/5/6/005