论文标题
探索大麦芽云V中早期簇形成的性质和同步性：古代球状簇中的多个种群
Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud V: Multiple Populations in ancient Globular Clusters
论文作者
论文摘要
我们检查了四个古老的大型麦哲伦云（LMC）球状簇（GCS），以证明使用高级相机进行调查的高级摄像头和Hubble Space望远镜程序GO-14164上的宽场摄像头3。 NGC 1466，NGC 1841和NGC 2257均显示了沿着主要序列红色的中期人口的证据。网状不会显示出有红色种群的证据，但是该GC的恒星数量最少，蒙特卡洛模拟表明，主序列恒星的样本太小，无法鲁棒地推断该群集中是否存在红色种群。其他三个集群中的第二个，红色的人口构成了主要人口总人口的$ \ sim30-40 \％$。这使古代LMC GC的总数具有已知的分裂或扩展为五个。但是，与Hodge 11和NGC 2210不同（请参阅Arxiv：1904.01434），没有一个簇显示水平分支中多个人群的证据。我们也没有发现沿红色巨型分支（RGB）的第二个人口的证据。
We examine four ancient Large Magellanic Cloud (LMC) globular clusters (GCs) for evidence of multiple stellar populations using the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope Programme GO-14164. NGC 1466, NGC 1841, and NGC 2257 all show evidence for a redder, secondary population along the main-sequence. Reticulum does not show evidence for the presence of a redder population, but this GC has the least number of stars and Monte Carlo simulations indicate that the sample of main sequence stars is too small to robustly infer whether a redder population exists in this cluster. The second, redder, population of the other three clusters constitutes $\sim30-40\%$ of the total population along the main-sequence. This brings the total number of ancient LMC GCs with known split or broadened main-sequences to five. However, unlike for Hodge 11 and NGC 2210 (see arXiv:1904.01434), none of the clusters show evidence for multiple populations in the horizontal branch. We also do not find evidence of a second population along the Red Giant Branch (RGB).
