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Paper: SPH Simulations of Accretion Flow via Roche Lobe Overflow and via Mass Transfer from Be Disk
Volume: 361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics
Page: 431
Authors: Hayasaki, K.; Okazaki, A.T.; Murray, J.R.
Abstract: We compare the accretion flow onto the neutron star induced by Roche lobe overflow with that by the overflow from the Be disk, in a zero eccentricity, short period binary with the same mass transfer rate, performing three-dimensional Smoothed Particle Hydrodynamics simulations. We find that a persistent accretion disk is formed around the neutron star in both cases. The circularization radius of the material transferred via Roche lobe overflow is larger than that of the material transferred from the Be disk. Thus, the growth of the accretion disk in the former case becomes significantly slower than in the latter case. In both cases, the mass accretion rate is very small and varies little with orbital phase, which is consistent with the observed X-ray behavior of Be/X-ray binaries with circular orbits (e.g. XTE J1543-568).
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