COMBINED EFFECTS OF BINARIES AND STELLAR ROTATION ON THE COLOR–MAGNITUDE DIAGRAMS OF INTERMEDIATE-AGE STAR CLUSTERS
COMBINED EFFECTS OF BINARIES AND STELLAR ROTATION ON THE COLOR–MAGNITUDE DIAGRAMS OF INTERMEDIATE-AGE STAR CLUSTERS
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DOI：
10.1088/2041-8205/761/2/l22
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
Zhongmu Li;C. Mao;Li Chen;Qian Zhang
中科院分区：
文献类型：
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作者：
Zhongmu Li;C. Mao;Li Chen;Qian Zhang
大麦哲伦星云中约70%的中间年龄星星团已被证实具有宽的主序星序、多个或延伸的分叉和双红巨星团。观察到的结果似乎与经典的观点不一致，即这样的星团是简单的恒星种群。虽然许多模型被用来解释这些结果，如漫长的星星形成历史，金属丰度传播，差异红化，选择效应，观测不确定性，恒星自转，和二元相互作用的影响，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。结果，它显示了“高尔夫俱乐部”的颜色-星等图，具有宽的或多个转折点，双红色团块，蓝色离散者，红色离散者和扩展的主层序。由于联星和大质量旋转子都很常见，我们的结果表明，大多数色星等图，包括扩展关闭或多个关闭，都可以使用包括联星和恒星旋转效应的简单恒星种群或具有两个分量的复合种群来解释。
About 70% of intermediate-age star clusters in the Large Magellanic Clouds have been confirmed to have broad main sequence, multiple or extended turnoffs, and dual red giant clumps. The observed result seems to be at odds with the classical idea that such clusters are simple stellar populations. Although many models have been used to explain the results via factors such as prolonged star formation history, metallicity spread, differential reddening, 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 turnoffs, dual red clumps, 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 turnoff or multiple turnoffs, can be explained using simple stellar populations including both binary and stellar rotation effects, or composite populations with two components.