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    Resonant Switch Model of Twin Peak HF QPOs Applied to the Source 4U 1636-53

    Zdeněk Stuchlík · 01 prosince, 2012 · Fyzika · 0 comments
    0

    Publication date: Dec 2012

    Abstract:
    Resonant Switch (RS) model of twin peak high-frequency quasi-periodic
    oscillations (HF QPOs) assumes switch of twin oscillations at a resonant
    point where frequencies of the upper and lower oscillations
    νU and νL become commensurable and the twin
    oscillations change from one pair of the oscillating modes
    (corresponding to a specific model of HF QPOs) to some other pair due to
    non-linear resonant phenomena. The RS model is used to determine range
    of allowed values of spin a and mass M of the neutron star located in
    the atoll source 4U 1636-53 where two resonant points are observed at
    frequency ratios νU:νL=3:2, 5:4. We consider
    the standard specific models of the twin oscillations based on the
    orbital and epicyclic geodetical frequencies. The resonant points are
    determined by the energy switch effect exhibited by the vanishing of the
    amplitude difference of the upper and lower oscillations. The predicted
    ranges of the neutron star parameters are strongly dependent on the twin
    modes applied in the RS model. We demonstrate that for some of the
    oscillatory modes used in the RS model the predicted parameters of the
    neutron star are unacceptable. Among acceptable RS models the most
    promising are those combining the Relativistic Precession and the Total
    Precession frequency relations or their modifications.

    Authors:
    Stuchlík, Z.; Kotrlová, A.; Török, G.;

    http://adsabs.harvard.edu/abs/2012AcA….62..389S

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