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arXiv 2102.12146astro-ph.SRastro-ph.GA
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简单星族球状星团中红巨星的质量损失律

Mass loss law for red giant stars in simple population globular clusters

M. Tailo, A. P. Milone, E. P. Lagioia, F. D'Antona, S. Jang, E. Vesperini, A. F. Marino, P. Ventura, V. Caloi, M. Carlos, G. Cordoni, E. Dondoglio, A. Mohandasa… 展开作者

M. Tailo, A. P. Milone, E. P. Lagioia, F. D'Antona, S. Jang, E. Vesperini, A. F. Marino, P. Ventura, V. Caloi, M. Carlos, G. Cordoni, E. Dondoglio, A. Mohandasan, J. E. Nastasio, M. V. Legnardi

备注：
10 pages, 7 figures, 3 tables, accepted for publication on MNRAS
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摘要：

恒星在红巨星分支（RGB）阶段的质量损失量是理解和正确模拟恒星演化后期阶段的主要参数之一。然而，对RGB质量损失的全面了解仍然缺失。银河系球状星团（GC）是理想的目标，以获得经验公式的质量损失，但具有不同化学成分的多个人口的存在一直是一个重大的挑战，以限制恒星质量和RGB质量损失。最近的工作已经解开了不同的恒星星族沿RGB和46个GC的水平分支（HB），从而提供了可能性，以估计每个恒星星族的RGB质量损失。对于具有原始化学成分的恒星星族（称为第一代或1G恒星）推断的质量损失与星团金属丰度密切相关。这一发现使我们能够推导出1G恒星的经验RGB质量损失定律。本文利用高精度的{ \it Hubble-Space Telescope}测光和精确的合成测光方法，对七个没有多重布居证据的GC进行了研究，并推导了RGB质量损失。我们发现一个集群到集群的变化范围从$\sim$ 0.1 $\sim$ 0.3 $M_{\odot}$的质量损失。简单种群GC的RGB质量损失与宿主团簇的金属丰度相关。简单星族GC和多星族GC的1G星遵循类似的质量损失与金属丰度关系的发现表明，由此产生的质量损失定律是恒星演化的标准结果。

英文摘要：

The amount of mass lost by stars during the red-giant branch (RGB) phase is one of the main parameters to understand and correctly model the late stages of stellar evolution. Nevertheless, a fully-comprehensive knowledge of the RGB mass loss is still missing. Galactic Globular Clusters (GCs) are ideal targets to derive empirical formulations of mass loss, but the presence of multiple populations with different chemical compositions has been a major challenge to constrain stellar masses and RGB mass losses. Recent work has disentangled the distinct stellar populations along the RGB and the horizontal branch (HB) of 46 GCs, thus providing the possibility to estimate the RGB mass loss of each stellar population. The mass losses inferred for the stellar populations with pristine chemical composition (called first-generation or 1G stars) tightly correlate with cluster metallicity. This finding allows us to derive an empirical RGB mass-loss law for 1G stars. In this paper we investigate seven GCs with no evidence of multiple populations and derive the RGB mass loss by means of high-precision {\it Hubble-Space Telescope} photometry and accurate synthetic photometry. We find a cluster-to-cluster variation in the mass loss ranging from $\sim$0.1 to $\sim$0.3 $M_{\odot}$. The RGB mass loss of simple-population GCs correlates with the metallicity of the host cluster. The discovery that simple-population GCs and 1G stars of multiple population GCs follow similar mass-loss vs. metallicity relations suggests that the resulting mass-loss law is a standard outcome of stellar evolution.

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