摘要
近年来对吸积流的数值模拟工作证实了在星风吸积中吸积盘的存在。本文在此基础上，讨论具有早型伴星的Ｘ射线脉冲星吸积过程中吸积盘与球吸积流的相互作用。我们发现，盘吸积率和球吸积率的相对变化可以导致吸积盘和吸积矩的改变，从而解释了这类脉冲星脉冲周期的复杂变化，我们以典型星ＶｅｌａＸ－１和Ａ０５３５＋２６为例分别作了讨论。
Recent numerical simulations of accretion flows support the existence of accretion disk in wind-fed case.Based on this suggestion we discuss the interaction of disk and spherical accretion streams for X-ray pulsars with early-type companions.We find that relative fluctuations of disk-accretion rate and spherical-accretion rate may lead to disk variations and accretion torque which accounts for the complicated pulseperiod changes.Two typical sources,Vela X-1 and A0535+26,are discussed.
基金
国家自然科学基金
国家教委博士生培养基金
关键词
脉冲星
星风
吸积盘
X射线
X-ray pulsars
stellar wind
accretion disk
