The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars
The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars
复制标题
DOI：
10.1017/pasa.2014.21
复制
发表时间：
2014-05
影响因子：
6.3
通讯作者：
A. Karakas;J. Lattanzio
中科院分区：
文献类型：
--
作者：
A. Karakas;J. Lattanzio
宇宙的化学演化是由恒星的化学产额决定的，而恒星的化学产额又主要由恒星的初始质量决定。即使是低至0.9M⊙的恒星，在低金属丰度下也能促进元素的化学演化。质量小于10M⊙的恒星会经历反复的混合事件，这可能会显著改变包层的表面成分，观测到的碳、氮、氟和重元素的富集量是通过慢中子捕获过程(S过程)合成的。低质量和中等质量恒星通过恒星外流或风释放它们的核合成产物，这与大质量恒星以核心塌缩超新星的形式爆炸形成对比。本文回顾了从主星序到渐近巨星分支(AGB)顶端~10M⊙单星的恒星演化和核合成。我们讨论了影响理论计算的主要不确定性，并回顾了最新的观测数据，这些数据被用来约束恒星模型的不确定细节。最后，我们回顾了质量小于约10M⊙的恒星的产额，并讨论了各个小组为解决这些问题所做的努力，并为覆盖广泛金属元素的低质量和中等质量恒星提供了均匀的产额。
Abstract The chemical evolution of the Universe is governed by the chemical yields from stars, which in turn are determined primarily by the initial stellar mass. Even stars as low as 0.9 M⊙ can, at low metallicity, contribute to the chemical evolution of elements. Stars less massive than about 10 M⊙ experience recurrent mixing events that can significantly change the surface composition of the envelope, with observed enrichments in carbon, nitrogen, fluorine, and heavy elements synthesized by the slow neutron capture process (the s-process). Low- and intermediate-mass stars release their nucleosynthesis products through stellar outflows or winds, in contrast to massive stars that explode as core-collapse supernovae. Here we review the stellar evolution and nucleosynthesis for single stars up to ~ 10 M⊙ from the main sequence through to the tip of the asymptotic giant branch (AGB). We include a discussion of the main uncertainties that affect theoretical calculations and review the latest observational data, which are used to constrain uncertain details of the stellar models. We finish with a review of the stellar yields available for stars less massive than about 10 M⊙ and discuss efforts by various groups to address these issues and provide homogeneous yields for low- and intermediate-mass stars covering a broad range of metallicities.