Forced oscillations in accretion disks and kHz QPOs

Details Forced oscillations in accretion disks and kHz QPOs Forced oscillations in accretion disks and kHz QPOs

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..797..599p&link_type=abstract

INTERACTING BINARIES: Accretion, Evolution, and Outcomes. AIP Conference Proceedings, Volume 797, pp. 599-602 (2005).

Computer Science

Accretion Disks, X-Ray Binary Stars, Oscillations, Accretion And Accretion Disks, X-Ray Binaries

Scientific paper

We propose a new model to explain the high frequency QPOs (kHz-QPOs) observed in LMXBs. The idea consists to add a rotating asymmetric component in either the gravitational or magnetic field of the accreting star. We show that the linear stability analysis of a disk evolving in such a structure predicts the existence of 3 instability types: a corotation resonance, a parametric resonance and a resonance due to a driving force, similar to the Lindblad resonance. These results are generalized by performing 2D non-linear simulations using a pseudo-spectral method. Lastly, we discuss the observational consequences of these instabilities on the light curves emitted by the disk, allowing later a confrontation with the observations.

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