摘要
本文给出了改进的一维吸积柱模型，探讨了在大吸积率下吸积柱的结构及物理性质，并理论推导吸积柱内下落物质的温度、密度及速度的变化。计算结果表明，它自上而下可以分为几个部分：冲击区（辐射压减速压）、理想气体压减速区、简并气体压减速区、外流区。作为例证，详细计算了吸积率Ｍ≈１０＾１７ｇ／ｓ，极区磁场强度Ｂｍ≈１０＾８Ｔ的中子星吸积柱。探讨了吸积柱内的热核反应。
he infalling movement of the matter accreted onto a magnetized neutron star is discussed. A one-dimensional accretion column model is presented to describe the variationsof the infalling velocity, density and temperature of the infalling plasma. The column canbe divided from top down into four zones, impact, deceleration of ideal gas, decelerationo f degenerate gas and outflow. As an example, the accretion column for an accretion rateof 10~17g/s and a polar magnetic field of108 T was calculated. We discuss thermonuclear reaction inside the column, and consider that it may be related to the quasi-periodicoscillation (QPO) of the X-ray flux in low-mass close binaries.
基金
国家自然科学基金
