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arXiv 1608.04554astro-ph.GA
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大麦云云扩展主序关断星系团的布居分析

An Analysis of the Population of Extended Main Sequence Turn-off Clusters in the Large Magellanic Cloud

Andrés E. Piatti, Nate Bastian

摘要:

结合近年来对大麦云云(LMC)中的中间年龄恒星团($1-2$ Gyr)的扩展主序关闭(eMSTO)现象的研究,探讨其起源。通过采用最大的样本eMSTO LMC集群迄今使用,我们表明,集群核心半径,质量和动力学状态是不相关的eMSTO的成因。实际上,我们样品中的团簇的核半径、质量和年龄-弛豫时间比分别在$\approx$ 2- 6 pc、3.35- 5.50(log($M_{cls}$ / $M_\odot$)和0.2-8.0的范围内。这些结果意味着eMSTO现象不是由集群内的实际年龄分布引起的。此外,我们确认从一个更大的集群样本最近的结果,包括年轻的eMSTO LMC集群,在MSTO的FWHM与集群年龄的相关性最强,这表明恒星的进化效应是根本原因。

英文摘要:

We combine a number of recent studies of the extended main sequence turn-off (eMSTO) phenomenon in intermediate age stellar ($1-2$ Gyr) clusters in the Large Magellanic Cloud (LMC) in order to investigate its origin. By employing the largest sample of eMSTO LMC clusters so far used, we show that cluster core radii, masses, and dynamical state are not related to the genesis of eMSTOs. Indeed, clusters in our sample have core radii, masses and age-relaxation time ratios in the range $\approx$ 2--6 pc, 3.35- 5.50 (log($M_{cls}$/$M_\odot$) and 0.2-8.0, respectively. These results imply that the eMSTO phenomenon is not caused by actual age spreads within the clusters. Furthermore, we confirm from a larger cluster sample recent results including young eMSTO LMC clusters, that the FWHM at the MSTOs correlates most strongly with cluster age, suggesting that a stellar evolutionary effect is the underlying cause.

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