星系外染色体图：中间年龄的SMC星系团Lindsay 1
An Extragalactic Chromosome Map: The intermediate age SMC Cluster Lindsay 1
摘要：
恒星间丰度变化的发现（又名在球状星团（GCs）中的多种群（MP）（通常在野外或较低质量的疏散星团中找不到）导致了对GCs的独特性质的研究，这些性质允许它们承载这种现象。最近的研究表明，MP不仅限于古老的GC，而且还存在于年龄低至（至少）2 Gyr的大规模集群中。这一发现对于理解MP现象的物理学很重要，因为这些年轻的星团可以提供比老星团更强的约束（例如对星团内潜在年龄分布的约束）。然而，由于在研究中采用了不同的过滤器，因此还不可能直接比较古老的GC和中间星系团。在这里，我们提出了新的HST紫外测光的7.5陀螺仪，大规模SMC集群，林赛1，为了比较其伪彩色彩色图的银河系GC。我们发现，它们几乎是相同的，并得出结论，MPs现象是相同的，无论集群的年龄和宿主星系。
英文摘要：
The discovery of star-to-star abundance variations (a.k.a. multiple populations - MPs) within globular clusters (GCs), which are generally not found in the field or in lower mass open clusters, has led to a search for the unique property of GCs that allow them to host this phenomenon. Recent studies have shown that MPs are not limited to the ancient GCs but are also found in massive clusters with ages down to (at least) 2 Gyr. This finding is important for understanding the physics of the MP phenomenon, as these young clusters can provide much stronger constraints (e.g. on potential age spreads within the clusters) than older ones. However, a direct comparison between ancient GCs and intermediate clusters has not yet been possible due to the different filters adopted in their studies. Here we present new HST UV photometry of the 7.5 Gyr, massive SMC cluster, Lindsay 1, in order to compare its pseudo colour-colour diagram to that of Galactic GCs. We find that they are almost identical and conclude that the MPs phenomenon is the same, regardless of cluster age and host galaxy.
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