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    On a multi-resonant origin of high frequency QPOs in the atoll source 4U 1636-53

    Zdeněk Stuchlík · Prosinec 01, 2007 · Fyzika · 0 comments
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    Publication date: Dec 2007

    Abstract:
    The kHz quasiperiodic oscillations (QPOs) observed in low-mass X-ray
    neutron star binaries are most likely connected to the orbital motion in
    the accretion disc and show datapoint clustering of frequency ratio
    between the upper and lower QPOs in small natural numbers. It is shown
    for the atoll source 4U 1636-53 that using the Hartle-Thorne metric to
    describe the neutron star spacetime, the data clustered around the
    frequency ratios 3/2 and 5/4 could be fitted by three models
    (Relativistic Precession, Vertical Precession and Total Precession)
    involving the hot spot orbital motion with Keplerian, radial epicyclic
    and vertical epicyclic frequencies. We demonstrate that with taking
    into account the hotspots interaction with the neutron star magnetic
    field the discussed three models can provide good fits implying
    reasonable values of the neutron star mass and angular momentum.
    Therefore the hypothesis of more instances of one orbital resonance has
    the potential to explain the kHz QPO nature in the source 4U 1636-53.

    Authors:
    Török, Gabriel; Bakala, Pavel; Stuchlík, Zdeněk; Šrámková, Eva;

    http://adsabs.harvard.edu/abs/2007ragt.meet..489T

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