Publication date: Feb 2013
Abstract:
We present a Resonant Switch (RS) model of twin peak high-frequency
quasi-periodic oscillations (HF QPOs), assuming switch of twin
oscillations at a resonant point, where frequencies of the upper and
lower oscillations νU and νL become to be
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 enables to
determine range of allowed values of spin a and mass M of the neutron
star located at the atoll source 4U 1636-53 where two resonant points
are observed at frequency ratios νU : νL =
3:2, 5:4.
Authors:
Stuchlík, Zdeněk; Kotrlová, Andrea; Török, Gabriel;