Publication date: Jan 2011
Abstract:
Exchange of dominance between twin kHz quasi-periodic oscillations
(QPOs) observed in some low-mass-X-ray-binaries (LMXBs) suggests the
possibility of a resonance between two oscillatory modes. We study the
behaviour of the effective gravitational potential around specific
resonant radii, and estimate the role of the higher-order terms
governing the non-linear, anharmonic forcing. We discuss the impact it
has on the mode amplitude in the linear and non-linear regimes. We also
discuss a related possibility of lowering of the neutron star mass
estimates from the highest observed QPO frequencies.
Authors:
Stuchlík, Z.; Kotrlová, A.; Török, G.;