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Paper: Accretion/Decretion Disk Dynamics in Be/X-ray Binaries
Volume: 367, Massive Stars in Interactive Binaries
Page: 485
Authors: Okazaki, A.T.
Abstract: We study the dynamics of disk systems in Be/X-ray binaries, based on the results from three-dimensional Smoothed Particle Hydrodynamics simulations. We find that the Be decretion disk is tidally/resonantly truncated at a radius smaller than the periastron distance, except in systems with very high orbital eccentricities and/or large inclination angles. In misaligned systems, the Be disk precesses little when the mass is supplied continuously from the Be star, whereas it precesses in the retrograde direction when no mass is supplied. The truncated disk around the Be star in an eccentric orbit makes the mass transfer towards the neutron star reduced and strongly phase-dependent. The accretion disk, which is necessarily time-dependent, is persistent in systems with a moderate orbital eccentricity, whereas it is transient in highly eccentric systems.
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