THE CONTRIBUTIONS OF INTERACTIVE BINARY STARS TO DOUBLE MAIN-SEQUENCE TURNOFFS AND DUAL RED CLUMP OF INTERMEDIATE-AGE STAR CLUSTERS

THE CONTRIBUTIONS OF INTERACTIVE BINARY STARS TO DOUBLE MAIN-SEQUENCE TURNOFFS AND DUAL RED CLUMP OF INTERMEDIATE-AGE STAR CLUSTERS
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交互双星对双主序转向和中年龄星团双红团簇的贡献

DOI:
10.1088/2041-8205/731/2/l37
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发表时间:
2011-03
影响因子:
7.9
通讯作者:
Liu, Kang
Liu, Kang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yang, Wuming;Meng, Xiangcun;Bi, Shaolan;Tian, Zhijia;Li, T;a;Liu, Kang

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双或扩展的主序列关闭(DMSTO)和双红团(RC)在中等年龄的集群中观察到,如NGC 1846和419。DMSTO被解释为该星团有两个不同的恒星群体,年龄相差约2亿至3亿年,但具有相同的金属丰度。双RC被解释为一个长期的星星形成的结果。利用星族合成方法,计算了双星星族的演化。我们发现,二进制的相互作用和合并可以重现双重RC的颜色星等图的一个中等年龄的集群,而实际上只有一个单一的人口存在。此外,二元相互作用可以导致扩展的主序列关闭(MSTO),而不是DMSTO。然而,主序星的其余部分、次巨星分支和第一巨星分支几乎不受双星相互作用的影响。部分观察到的双RC和扩展MSTO可能是二元相互作用和合并的结果。
Double or extended main-sequence turnoffs (DMSTOs) and dual red clump (RC) were observed in intermediate-age clusters, such as in NGC 1846 and 419. The DMSTOs are interpreted as that the cluster has two distinct stellar populations with differences in age of about 200–300 Myr but with the same metallicity. The dual RC is interpreted as a result of a prolonged star formation. Using a stellar population-synthesis method, we calculated the evolution of a binary-star stellar population. We found that binary interactions and merging can reproduce the dual RC in the color–magnitude diagrams of an intermediate-age cluster, whereas in actuality only a single population exists. Moreover, the binary interactions can lead to an extended main-sequence turnoff (MSTO) rather than DMSTOs. However, the rest of the main sequence, subgiant branch, and first giant branch are hardly spread by the binary interactions. Part of the observed dual RC and extended MSTO may be the results of binary interactions and mergers.
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