转动潮汐变形双星表面重力加速度的数值模拟

The simulations of gravitational accelerations in a rotational distorted binary system

转动和潮汐效应是影响双星结构演化非常重要的物理因素。在转动双星系统中,根据考虑转动潮汐变形的高阶扰动势数值计算了主星表面的重力加速度的分布,并与洛希模型计算的表面重力加速度分布做了对比。结果发现:转动和潮汐对恒星表面的重力加速度的大小和分布有重要影响,采用本文中的初始参数进行演化计算,最大影响可达到103～104 cm/s2。因此在讨论恒星结构和演化时,转动和潮汐变形是不可忽略的重要因素。

Rotation and tide are two very important physical factors which affect the structure and evolution of a binary system. The distributions of the effective gravitational accelerations which are derived by the high-order perturbation potential have been simulated. The distribution is compared with the one which has been derived from the Roche model. The results show that the distortions of rotation and tide have a significant impact on the effective gravitational accelera- tions. The maximum can attain 10^3 - 10^4cm/s^2 with the initial parameters. Therefore, the distortions can not be neglected in discussing the structure and evolution of a close binary system.