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Resonant radii of kHz quasi-periodic oscillations in Keplerian discs orbiting neutron stars

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.

preprint2010arXivOpen access
Zdenek StuchlikAndrea KotrlovaGabriel Torok
astro-ph.HE
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Open access3 authors1 topic
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Zdenek StuchlikAndrea KotrlovaGabriel Torok

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