13个球状星团的单星和双星星族合成研究

A Single and Binary Star Stellar Populations Synthesis Study of 13 Globular Clusters

分别采用单星星族演化模型和双星星族演化模型对13个球状星团进行了研究。结果表明:球状星团是年老且金属丰度低的星团;单星星族模型和双星星族模型拟合得到的年龄和金属丰度的相对结果是一致的,但绝对结果有区别,区别在于:用单星星族模型拟合得到的星族年龄比双星星族的年龄明显偏小,而金属丰度稍大。由于双星普遍存在是不争的事实,使用双星星族模型得到的球状星团年龄可以更好地限制宇宙年龄的下限和进行更深层次的研究。

Thirteen globular clusters are studied via single-star stellar population synthesis models and binary-star stellar population synthesis models respectively in this paper.The results show that：the sample GCs are old and metal-low.The relative results obtained via ssSSPs and bsSSPs are similar in age,but different in the absolute values.The difference is that when ssSSPs models are used to determine the ages and metallicities of globular clusters,smaller ages and a little larger metallicities are obtained.Because of the existence of binary stars,the ages of globular clusters obtained via bsSSPs can restrict universe age more effectively and make the futher study of it.