Powerful CMD: a tool for color-magnitude diagram studies

Powerful CMD: a tool for color-magnitude diagram studies
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强大的 CMD:颜色幅度图研究工具

DOI:
10.1088/1674-4527/17/7/71
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发表时间:
2017-04
影响因子:
1.8
通讯作者:
Ruxi Li
Ruxi Li
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhongmu Li;Caiyan Mao;Qiping Luo;Zhou Fan;Wenchang Zhao;Li Chen;Ruxi Li

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提出了一种新的色幅图研究工具Powerful CMD。该工具基于先进的恒星布居合成(ASPS)模型,考虑了单星、双星、自转星和星星的形成历史。通过Powerful CMD,可以从观测到的CMD中同时确定星星团的距离模、色余、金属丰度、年龄、二元分数、旋转星星分数和星星形成历史。通过模拟和真实的星星集群的新工具进行了测试。本文测定了星系团NGC 6362、NGC 6652、NGC 6838和M67的五个参数,并与其它工作进行了比较。它表明,该工具是有用的CMD研究,特别是对于那些利用哈勃太空望远镜(HST)的数据。此外,我们发现,列入双星的理论恒星人口模型可能会导致更小的颜色过剩相比,单星人口模型的情况下。
We present a new tool for color-magnitude diagram (CMD) studies, Powerful CMD. This tool is built based on the advanced stellar population synthesis (ASPS) model, in which single stars, binary stars, rotating stars and star formation history have been taken into account. Via Powerful CMD, the distance modulus, color excess, metallicity, age, binary fraction, rotating star fraction and star formation history of star clusters can be determined simultaneously from observed CMDs. The new tool is tested via both simulated and real star clusters. Five parameters of clusters NGC 6362, NGC 6652, NGC 6838 and M67 are determined and compared to other works. It is shown that this tool is useful for CMD studies, in particular for those utilizing data from the Hubble Space Telescope (HST). Moreover, we find that inclusion of binaries in theoretical stellar population models may lead to smaller color excess compared to the case of single-star population models.
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