On the kHz QPO frequency correlations in bright neutron star X-ray binaries

Details On the kHz QPO frequency correlations in bright neutron star X-ray binaries On the kHz QPO frequency correlations in bright neutron star X-ray binaries

2007-02-06

arxiv.org/abs/astro-ph/0702157v1

Mon.Not.Roy.Astron.Soc.376:1133-1138,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS; 7 pages, 4 figures

Scientific paper

10.1111/j.1365-2966.2007.11486.x

We re-examine the correlation between the frequencies of upper and lower kHz quasi-periodic oscillations (QPO) in bright neutron-star low-mass X-ray binaries. By including the kHz QPO frequencies of the X-ray binary Cir X-1 and two accreting millisecond pulsars in our sample, we show that the full sample does not support the class of theoretical models based on a single resonance, while models based on relativistic precession or Alfven waves describe the data better. Moreover, we show that the fact that all sources follow roughly the same correlation over a finite frequency range creates a correlation between the linear parameters of the fits to any sub-sample.

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