| Issue |
A&A
Volume 525, January 2011
|
|
|---|---|---|
| Article Number | A82 | |
| Number of page(s) | 5 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/201015029 | |
| Published online | 02 December 2010 | |
Research Note
Resonant radii of kHz quasi-periodic oscillations in Keplerian discs orbiting neutron stars
Institute of Physics, Faculty of Philosophy and Science, Silesian
University in Opava,
Bezručovo nám. 13,
74601
Opava,
Czech Republic
e-mail: zdenek.stuchlik@fpf.slu.cz; andrea.kotrlova@fpf.slu.cz, terek@volny.cz
Received:
21
May
2010
Accepted:
12
September
2010
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.
Key words: accretion, accretion disks / stars: neutron / X-rays: binaries
© ESO, 2010
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