RGB星分界点的不同对恒星演化的影响

The impact of the difference of demarcation points of RGB stars on stellar evolution

提出恒星演化阶段分界点的不同会影响恒星在赫罗图中演化轨迹的观点.基于在恒星演化计算中质量损失率应是一连续的分段函数的考虑,使用改进后的恒星演化计算程序.采用2种不同的分界点分别计算了恒星的演化,基于质量损失率函数连续性的考虑,对于主序星与RGB星的分界点,选取Hayashi线光度最低处比选取核心H丰度为零处更合适.

An attitude of different demarcation points of stellar evolutional stages would affect the evolutionary track in the Hertzsprung-Russell diagram was presented based on mass loss rate, a consecutive piecewise func- tion in the stellar evolution calculations was developed by using modified evolution code. 2 evolutional models with different demarcation point was computed, conclusion suggested that it was more suitable to choose the lowest luminosity in the Hayashi line as the demarcation point than to choose the moment which abundance of Hydrogen of core equal to zero, according to the continuity of mass loss rate function.