Abstract
We briefly review the proposed relations between the frequencies of twin kilohertz quasi-periodic oscillations (kHz QPOs) and the spin frequencies in neutron star low-mass X-ray binaries (NSLMXBs). To test the validity of the proposed models, we estimate the spin frequencies under these theoretical relations and compare them with the measured ones. It seems that magnetohydrodynamic (MHD) oscillations are more promising to account for the kHz QPOs.
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