Non‐axisymmetric Structure of Accretion Disks around the Neutron Star in Be/X‐ray Binaries

作     者：Kimitake Hayasaki Atsuo T. Okazaki 

作者机构：Department of Applied Physics Graduate School of Engineering Hokkaido University Kitaku N13W8 Sapporo 060‐8628 Japan Centre for Astrophysics and Supercomputing Swinburne University of Technology Hawthorn Victoria 3122 Australia Faculty of Engineering Hokkai‐Gakuen University Toyohira‐ku Sapporo 062‐8605 Japan 

出 版 物：《AIP Conference Proceedings》 

年 卷 期：2005年第797卷第1期

摘      要：A non‐axisymmetric structure of accretion disks around the neutron star in Be/X‐ray binaries is studied, analyzing the results from 3D SPH simulations performed by [1]. It is found that a 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 gradually damped afterwards. We also find that the orbital phase‐dependence of the mass‐accretion rate is mainly caused by the inward propagation of the spiral wave excited on the accretion disks.