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Conference Paper

Forced oscillations in accretion disks and kHz QPOs


Pétri,  Jérôme
Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Pétri, J. (2005). Forced oscillations in accretion disks and kHz QPOs. In L. Burderi, U. of Cagliari, & e. al. (Eds.), INTERACTING BINARIES: Accretion, Evolution, Outcomes (pp. 599-602). American Institute of Physics.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-87FE-0
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.