The correlations between the twin kHz QPO frequencies of LMXBs

Details The correlations between the twin kHz QPO frequencies of LMXBs The correlations between the twin kHz QPO frequencies of LMXBs

2006-01-16

arxiv.org/abs/astro-ph/0601318v1

Mon.Not.Roy.Astron.Soc. 366 (2006) 1373-1378

Astronomy and Astrophysics

Astrophysics

6 pages, accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2006.09920.x

We analyzed the recently published kHz QPO data in the neutron star low-mass X-ray binaries (LMXBs), in order to investigate the different correlations of the twin peak kilohertz quasi-eriodic oscillations (kHz QPOs) in bright Z sources and in the less luminous Atoll sources. We find that a power-law relation $\no\sim\nt^{b}$ between the upper and the lower kHz QPOs with different indices: $b\simeq$1.5 for the Atoll source 4U 1728-34 and $b\simeq$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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