An instability associated with a magnetosphere-disk interaction

Statistics – Computation

Scientific paper

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Accretion Disks, Magnetohydrodynamic Stability, Pulsar Magnetospheres, X Ray Binaries, Astronomical Models, Computational Astrophysics, Stellar Evolution

Scientific paper

The evolution of a thin accretion disk surrounding a rapidly rotating magnetosphere is considered. By taking account of the variations of the magnetospheric boundary in response to the conditions at the inner edge of the disk, we find from linear analysis and numerical computation that the accretion disk can become unstable. Mass can be accreted by the central object in a cyclic fashion, with the cycle involving the storage and release of mass in the inner parts of the disk. The physical origin of the instability is associated with the variations of the magnetospheric boundary about corotation. The recurrence time scale of the cycle can vary by several orders of magnitude depending on the details of the conditions at the magnotosphere. The possible applicability of this instability process to the 'rapid burster' MXB 1730-335 is briefly discussed.

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