Multiple populations in globular clusters
Multiple populations in globular clusters
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DOI：
10.1007/s00159-012-0050-3
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
R. Gratton;E. Carretta;A. Bragaglia
中科院分区：
文献类型：
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作者：
R. Gratton;E. Carretta;A. Bragaglia
球状星团研究的最新进展表明，它们不是简单的恒星种群，而是由多代组成的。证据来自光度学和光谱学。一个新的范式正在出现的大质量星星集群的形成，其中包括几个情节的星星形成。虽然这为球状星团的几个特征提供了解释，包括第二参数问题，但它也为球状星团和银河系晕之间的关系开辟了新的视角，并扩展到所有具有高特定频率球状星团的人群，例如，巨大的椭圆星系我们回顾了这方面的进展，重点是最近的研究。有几点仍有待正确理解，特别是关于在星团中产生丰度模式的污染物的性质和典型的时间尺度，这种现象活跃的星团质量范围，以及球状星团和我们银河系其他卫星之间的关系。
Recent progress in studies of globular clusters has shown that they are not simple stellar populations, but rather are made up of multiple generations. Evidence stems both from photometry and spectroscopy. A new paradigm is arising for the formation of massive star clusters, which includes several episodes of star formation. While this provides an explanation for several features of globular clusters, including the second-parameter problem, it also opens new perspectives on the relation between globular clusters and the halo of our Galaxy, and by extension on all populations with a high specific frequency of globular clusters, such as, e.g., giant elliptical galaxies. We review progress in this area, focussing on the most recent studies. Several points remain to become properly understood, in particular those concerning the nature of the polluters producing the abundance pattern in the clusters and the typical timescale, the range of cluster masses where this phenomenon is active, and the relation between globular clusters and other satellites of our Galaxy.