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Non-axisymmetric Structure of Accretion Disks in Be/X-ray Binaries | | Kimitake Hayasaki
; Atsuo T. Okazaki
; | | Date: |
9 Dec 2004 | | Subject: | astro-ph | | Affiliation: | 1,2) and Atsuo T. Okazaki ( Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn Victoria 3122, Australia | | Abstract: | The non-axisymmetric structure of accretion disks around the neutron star in Be/X-ray binaries is studied by analyzing the results from three dimensional (3D) Smoothed Particle Hydrodynamics (SPH) simulations. It is found that ram pressure due to the phase-dependent mass transfer from the Be-star disk excites a one-armed, trailing spiral structure in the accretion disk around the neutron star. The spiral wave has a transient nature; it is excited around the periastron, when the material is transferred from the Be disk, and is gradually damped afterwards. It is also found that the orbital phase-dependence of the mass-accretion rate is mainly caused by the inward propagation of the spiral wave excited in the accretion disk. | | Source: | arXiv, astro-ph/0412203 | | Services: | Forum | Review | PDF | Favorites | |
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