等级三星系统的运动学研究

A Study of Kinematics of the Hierarchical Triple Stars

统计分析表明,在目前的观测精度(1mas)下,由于三体效应大多数等级三星系统已不能用经典的双二体运动学模型来描述;即使对于应用需求而言,该模型也不再适用于描述三体视效应较强的等级三星系统。因为在实用星表参考架中不宜采用数据量较大的数值历表来描述子星的运动,所以有必要针对等级三星系统建立尽可能简单实用的运动学模型。借助已有的观测资料和拟合研究结果,给出了6个等级三星系统的质量参数和初始条件,进而根据实用需求讨论了这些系统的运动学描述问题。

Our statistical analysis shows that, the classical double two-body model cannot be used to describe the kinematics of most hierarchical triple star systems on condition of observational accuracy nowadays （1mas） as a result of three-body effects. Even for the usual practical requirements, this model also cannot be used to figure those systems suffering significant three-body effects. Because it is not practical to use numerical ephemerides with a large volume of data to describe the kinematics of component stars in a star catalogue, a kinematics model, as simple and practical as possible, is needed for the hierarchical triple star systems. Based on the available observations and their associated fitting results, we obtain consistent mass parameters and initial conditions of six hierarchical triple star systems. How to outline the kinematics of these systems on the basis of practical requirements is also discussed.