Non-linear oscillations of the magnetosphere around neutron stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Neutron Stars, Stellar Magnetospheres, Stellar Oscillations, Taylor Instability, X Ray Sources, Nonlinear Systems, Stellar Mass Accretion, Stellar Models, Stellar Rotation

Scientific paper

The unsteady motion of the mass reservoir formed by accretion onto the magnetosphere around rotating neutron stars is studied using a physically simplified model. The unsteady motion of the reservoir induces secondary accretion onto the neutron star by Rayleigh-Taylor instability. The nonperiodic or quasi-periodic phenomena of X-ray bursters seem to be related to this property of the mass reservoir on the magnetosphere. The typical dynamical state of the reservoir is classified into three types: non-sequential oscillation, sequential periodic oscillation, and chaotic oscillation states.

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