Correlations of twin kHz QPOs and spins of the neutron stars in LMXBs

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Neutron Stars, Pulsars, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

The correlations between the twin kHz QPOs, as well as their relations to neutron star spins, are summarized. For most sources power law correlations between the frequencies of the twin kHz QPOs are preferred. It is difficult to reconcile a spin frequency with the kHz QPO frequency difference. The kHz QPO frequencies of two accreting millisecond pulsars, SAX J1808.4-3658 and XTE J1807-294, are generally lower than those of other sources, and there exists a 1.5 times shift factor in frequency if we plot the kHz QPO data points of both pulsars to agree with the tendencies of the other sources. Furthermore, the kHz QPO model by Stella and Vietri needs to assume the stellar mass to be 3 solar mass to reconcile their model with the data of SAX J1808.4-3658 and XTE J1807-294.

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