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Internal resonance ...
Internal resonance in nonlinear disk oscillations and the amplitude evolution of neutron-star kilohertz QPOs
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Horák, J. (författare)
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- Abramowicz, Marek A, 1945 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Kluzniak, W. (författare)
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visa fler...
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Rebusco, P. (författare)
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Török, G. (författare)
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visa färre...
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(creator_code:org_t)
- 2009
- 2009
- Engelska.
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Ingår i: Astronomy and Astrophysics. ; 499:2, s. 535-540
- Relaterad länk:
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https://gup.ub.gu.se...
Abstract
Ämnesord
Stäng
- We study the properties of twin kilohertz quasiperiodic oscillations (QPOs) with a simple toy model consisting of two oscillation modes coupled with a general nonlinear force. We examine resonant effects by slowly varying the values of the tunable, and nearly commensurable, eigenfrequencies. The behavior of the true oscillation frequencies and amplitudes during a slow transition through the 3:2 resonance is examined in detail, and it is shown that both are affected significantly by the nonlinearities in the governing equations. In particular, the amplitudes of oscillations reflect a resonant exchange of energy between the modes, and as a result the initially weaker mode may become dominant after the transition. We note that a qualitatively similar behavior was reported for several neutron-star sources where the difference in the amplitudes of neutron-star twin-peak QPOs changes sign as the observed frequency ratio of the QPOs passes through the value 3:2.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- X-rays: binaries
- stars: neutron
- accretion
- accretion disks
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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