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Lev Titarchuk (NASA/GSFC and GMU), Vladimir Osherovich (NASA/GSFC)
The rotation of neutron star magnetosphere (NSM) affects (through the Coriolis force) the oscillations of the blobs which presumably are formed in disk within a few neutron star radii. We put forth that effect leads to the appearance of the high hybrid frequency which is a combination of the Keplerian and the NS magnetosphere (NSM) rotational frequencies. The difference of the squares of the hybrid and Keplerian frequencies should tend to be almost constant in observations of kiloherth quasiperiodic oscillations (QPO). We find that for a number of sources (as we illustrate for Sco X-1, 4U1608-52 and 4U 1702-429) where the variable peak separation between the two kHz QPO peaks has been observed is well consistent with this hypothesis of the splitting of the main (Keplerian) frequency by the NSM rotation. The detection of these two KQPO frequencies along with the oscillation frequency during the burst would allow to measure the NS spin and NSM frequencies and consequently by comparing these frequencies to determine the depth of the NS potential well (or the NS radius) with a great accuracy.
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