The “weak” r-process in core-collapse supernovae

The “weak” r-process in core-collapse supernovae
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核心塌陷超新星中的“弱”r过程

DOI:
10.1017/s1743921305006174
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发表时间:
2005
期刊:
Proceedings of the International Astronomical Union
影响因子:
--
通讯作者:
Y. Ishimaru
Y. Ishimaru
中科院分区:
--
文献类型:
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作者:
S. Wanajo;Y. Ishimaru

文献摘要

被引文献

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虽然r-过程核的起源仍然是一个长期存在的谜,但最近对银河系晕中极贫金属恒星的光谱研究强烈表明它与核心坍缩超新星有关。此外,最近对这类恒星的全面分析暗示了“弱”r过程的存在,这只对A <130的较轻核负责。在这项研究中,我们表明,弱r过程核可以产生的中微子风从一个典型的原中子星星的$1.4 M_\odot$。这表明,弱r-过程元素(Sr,Y,Zr等)的显着部分。起源于典型的核心坍缩超新星,其前身质量范围为1000 - 20000万吨。
While the origin of r-process nuclei remains a long-standing mystery, recent spectroscopic studies of extremely metal-poor stars in the Galactic halo strongly suggest that it is associated with core-collapse supernovae. In addition, recent comprehensive analysis of such stars implies the presence of the “weak” r-process that is responsible for only lighter nuclei with A <130. In this study, we show that the weak r-process nuclei can be produced in the neutrino winds from a typical proto-neutron star of $1.4 M_\odot$. This suggests that the significant fraction of weak r-process elements (Sr, Y, Zr, etc.) originate from typical core-collapse supernovae with the progenitor mass range of ∼ 10–$20 M_\odot$