The correlations between the spin frequencies and kHz QPOs of Neutron Stars in LMXBs

Details The correlations between the spin frequencies and kHz QPOs of Neutron Stars in LMXBs The correlations between the spin frequencies and kHz QPOs of Neutron Stars in LMXBs

2007-05-10

arxiv.org/abs/0705.1431v3

2007,A&A,471,381

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20077069

We studied the correlations between spin frequencies and kilohertz quasi-periodic oscillations (kHz QPOs) in neutron star low mass X-ray binaries. The updated data of kHz QPOs and spin frequencies are statistically analyzed. We found that when two simultaneous kHz QPOs are present in the power spectrum, the minimum frequency of upper kHz QPO is at least 1.3 times larger than the spin frequency, i.e. \nu_{s}<\nu_{2min}/1.3. We also found that the average kHz QPO peak separation in 6 Atoll sources anti-correlates with the spin frequency in the form \lan\dn\ran = -(0.19\pm0.05)\ns+(389.40\pm21.67)Hz. If we shifted this correlation in the direction of the peak separation by a factor of 1.5, this correlation matches the data points of the two accretion powered millisecond X-ray pulsars, SAX J1808.4-3658 and XTE J1807-294.

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