Nucleosynthesis in early rotating massive stars and chemical composition of CEMP stars

Nucleosynthesis in early rotating massive stars and chemical composition of CEMP stars
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早期旋转大质量恒星的核合成和 CEMP 恒星的化学成分

DOI:
10.1088/1742-6596/1668/1/012006
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发表时间:
2020
期刊:
Conference Series
影响因子:
--
通讯作者:
Choplin A
Choplin A
中科院分区:
--
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--
作者:
Choplin A

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第一批大质量恒星通过释放宇宙中第一批金属(比氦重的元素)引发了化学演化的开始。这些恒星的性质以及早期的化学富集是如何发生的,在很大程度上仍然是未知的。恒星内部的旋转诱导混合可以影响大质量恒星生命期间的核合成,并导致具有各种化学成分的恒星喷出物。我们提出了低和零金属丰度20,25和40 M的恒星模型与各种初始旋转速率和假设的核反应速率。随着初始旋转的增加,光(从Al 2 O3到Al)和反式铁元素的产率增加。反式铁元素(特别是比Ba重的元素)受核反应不确定性的影响很大。观测到的CEMP(碳增强贫金属)恒星CS29528-028和HE 0336 + 0113的化学成分与快速旋转的40 M超新星模型喷射出的物质的化学成分一致。
The first massive stars triggered the onset of chemical evolution by releasing the first metals (elements heavier than helium) in the Universe. The nature of these stars and how the early chemical enrichment took place is still largely unknown. Rotational-induced mixing in the stellar interior can impact the nucleosynthesis during the stellar life of massive stars and lead to stellar ejecta having various chemical compositions. We present low and zero-metallicity 20, 25 and 40 M⊙ stellar models with various initial rotation rates and assumptions for the nuclear reactions rates. With increasing initial rotation, the yields of light (from∼ C to Al) and trans-iron elements are boosted. The trans-iron elements (especially elements heavier than Ba) are significantly affected by the nuclear reaction uncertainties. The chemical composition of the observed CEMP (carbon-enhanced metal-poor) stars CS29528-028 and HE0336+ 0113 are consistent with the chemical composition of the material ejected by a fast rotating 40 M⊙ model.
CEMP 的限制——没有来自核天体物理学的祖先
DOI: 10.1051/0004-6361/201628083
发表时间: 2016
期刊: arXiv: Solar and Stellar Astrophysics
影响因子: --
作者:
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期刊: Physics Letters B
影响因子: 4.4
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发表时间: 2018-07-01
影响因子: 8.7
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通讯作者: Chieffi, Alessandro