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arXiv 1302.0099astro-ph.SR
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双星和恒星自转对中等年龄星团色星等图的综合影响

Combined Effects of Binaries and Stellar Rotation on the Color-Magnitude Diagrams of Intermediate-Age Star Clusters

Zhongmu Li, Caiyan Mao, Li Chen, Qian Zhang

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发表信息：
2012,ApJ,761,L22
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摘要：

大麦云星云中约70%的中间年龄星团已被证实具有宽的主序星序、多个或延伸的转折点和双红巨星团块。这一观测结果似乎与认为这类星团是简单恒星星族的经典观点相悖。虽然许多模型已经被用来解释的结果，如长期的恒星形成历史，金属丰度传播，微分redenning，选择效应，观测不确定性，恒星旋转，和双的相互作用，特殊的颜色-星等图的原因仍然是不确定的。我们重新审视这个问题，通过结合恒星自转和双星效应。因此，它显示了“高尔夫俱乐部”的颜色-星等图，具有宽的或多个关闭，双红丛，蓝离散，红离散和扩展的主序列。由于双星和大质量旋转星都是常见的，我们的结果表明，大多数色星等图，包括延长关闭或多个关闭可以解释使用简单的恒星星族，包括双星和恒星旋转效应，或复合人口与两个组件。

英文摘要：

About seventy percent of intermediate-age star clusters in the Large Magellanic Clouds have been confirmed to have broad main sequence, multiple or extended turn-offs and dual red giant clumps. The observed result seems against the classical idea that such clusters are simple stellar populations. Although many models have been used for explaining the results via factors such as prolonged star formation history, metallicity spread, differential redenning, selection effect, observational uncertainty, stellar rotation, and binary interaction, the reason for the special color-magnitude diagrams is still uncertain. We revisit this question via the combination of stellar rotation and binary effects. As a result, it shows "golf club" color-magnitude diagrams with broad or multiple turn-offs, dual red clump, blue stragglers, red stragglers, and extended main sequences. Because both binaries and massive rotators are common, our result suggests that most color-magnitude diagrams including extended turn-off or multiple turn-offs can be explained using simple stellar populations including both binary and stellar rotation effects, or composite populations with two components.

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