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首页> 外文期刊>The Astrophysical Journal. Letters >Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo?
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Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo?

机译：在银河系中的低质量恒星之前红色巨型阶段的巨大锂增强？

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摘要

Li abundances in the bulk of low-mass metal-poor stars are well reproduced by stellar evolution models adopting a constant initial abundance. However, a small number of stars have exceptionally high Li abundances, for which no convincing models have been established. We report on the discovery of 12 very metal-poor stars that have large excesses of Li, including an object having more than 100 times higher Li abundance than the values found in usual objects, which is the largest excess in metal-poor stars known to date. The sample is distributed over a wide range of evolutionary stages, including five unevolved stars, showing no clear abundance anomaly in other elements. The results indicate the existence of an efficient process to enrich Li in a small fraction of low-mass stars at the mainsequence or subgiant phase. The wide distribution of Li-rich stars along the red giant branch could be explained by the dilution of surface Li by mixing that occurs when the stars evolve into red giants. Our study narrows down the problem to be solved in order to understand the origins of Li excess found in low-mass stars, suggesting the presence of an unknown process that affects the surface abundances preceding red giant phases.
机译：大量低质量金属差的恒星的李大量由恒星演化模型进行了很好的再现，采用恒定的初始丰度。然而，少数恒星具有特别高的锂丰度，没有令人信服的模型已经建立了令人信服的模型。我们报告了12个非常金属差的恒星的发现，这些李多尔有大量的李，其中一个物体比在通常的物体中发现的价值超过了100倍的物体，这是最大的金属贫乏恒星日期。样品分布在各种进化阶段，包括五个未经象限的星星，在其他元素中显示出不明确的丰富异常。结果表明，存在有效的方法，以在主要序列或亚脉期的小数颗粒中富集李。通过混合恒星进化到红色巨头时，可以通过混合稀释表面锂来解释沿红色巨型分支的广泛分布。我们的研究缩小了待解决的问题，以了解低质量恒星中发现的锂过量的起源，表明存在影响前一相的表面丰度的未知过程。

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