Shear-layer instabilities in accretion discs around magnetized compact objects

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Accretion Disks, Kelvin-Helmholtz Instability, Magnetic Field Configurations, Magnetohydrodynamic Stability, Neutron Stars, Shear Layers, White Dwarf Stars, Finite Volume Method, Perturbation, Rotating Disks

Scientific paper

The effect of strong magnetic fields and density contrasts in a slab jet model on the development of instabilities caused by velocity contrasts is investigated and applied to disk accretion onto a magnetized compact object. The perturbations propagating transverse to a magnetic field in external regions are shown not to be stabilizied. A strong density contrast at the jet boundary does not stabilize the instability of the acoustic resonance type (ARTI), the fundamental symmetric and antisymmetric modes being still unstable for any finite value of R. A comparative analysis of ARTI and the Kelvin-Helmholtz instability that is developed by surface modes of the interfaces between the disk material and magnetic field is performed. ARTI may be responsible for the accreting material's penetration into the magnetosphere as well as other mechanisms.

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