Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-10-10
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
research note, 5 pages, 6 figures, accepted for publication in Astronomy and Astrophysics
Scientific paper
Exchange of dominance between twin kHz quasi-periodic oscillations (QPOs) observed in some low-mass-X-ray-binaries (LMXB) 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.
Kotrlova Andrea
Stuchlik Zdenek
Torok Gabriel
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