Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300.1015l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 4, pp. 1015-1022.
Astronomy and Astrophysics
Astronomy
9
Accretion, Accretion Discs, Pulsars: General, Stars: Rotation
Scientific paper
The recent BATSE observations of the spin-up and spin-down of accreting pulsars have shown that the standard formulation for the accretion torque as proposed by Ghosh & Lamb may need to be revised. The observations indicate alternate spin-up and spin-down phases driven by torques of similar magnitude and typically larger than the mean torque. The variations of the torque in systems such as Cen X-3 are difficult to explain in terms of changes of the mass accretion rate. The implication is that the torque does not depend on the accretion rate as in the GL model. In this paper we argue that the observed changes in the spin rate can result from stochastic transitions between two magnetospheric states. In particular, we show that intermediate magnetospheric systems are not admissible, because of a disc-induced magnetospheric instability which exists in a star-disc magnetic interaction system. This explains why torque reversal occurs in disc accreting pulsars with similar magnitudes.
Li Jianke
Wickramasinghe Dayal T.
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