中国科学院云南天文台学术报告通知

2025年第11期

报告题目：The role of binary evolution in the large observed luminosity spread of red supergiants in young open clusters

报告人：王晨 助理教授

报告人单位：南京大学

报告语言：中文

报告时间：5月20日（星期二）10:30-11:30

报告地点：一号楼412会议室

报告摘要：

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Recent observations reveal that the observed luminosity range of red supergiants (RSGs) in young open clusters is broader than predicted by single-star evolution models, suggesting that binary evolution may play a key role. In this study, we present the first large-scale, detailed binary evolution models to predict the properties of RSGs in young open clusters. We identify which evolutionary scenarios contribute to which RSG populations. Based on this, we propose a more robust approach for estimating cluster ages compared to previous studies. Our findings confirm that in a coeval population, the luminosity of RSGs can span up to a factor of ten, as a consequence of mergers between two main-sequence stars. However, our results also indicate that binary effects alone cannot fully explain the number of RSGs with luminosities up to three times higher than those predicted by current single-star models. This discrepancy has important implications, and we suggest several avenues for future observational and theoretical studies to help resolve it.

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报告人简介： 

王晨，本科及硕士毕业于南京大学天文与空间科学学院，2022年于德国波恩大学获得天体物理博士学位。2022年至2025年在德国马克斯普朗克天体物理研究所从事博士后研究，2025年加入南京大学，现任助理教授。主要研究方向为大质量恒星的结构和演化，特别是双星系统的演化。构建了当前国际领先、参数涵盖最广的精细双星演化模型之一，并基于该模型系统性研究了年轻疏散星团中恒星演化的特征。相关成果发表于Nature Astronomy，ApJL等国际一流期刊。

邀请人：柳正伟

邀请方：大样本恒星演化研究团组、国际超新星中心、云南省国际超新星研究重点实验室