标题： II型超新星中的核合成和贫金属恒星中的丰度 显示英文标题

标题： Nucleosynthesis in Type II supernovae and the abundances in metal-poor stars

摘要： 我们探讨了各种参数（质量截断、中子过剩、爆炸能量、前身星质量）对II型超新星核合成的影响，以解释晕星中铁峰元素丰度比（[Cr/Fe]、[Mn/Fe]、[Co/Fe] 和 [Ni/Fe]）随金属量在$ -4 \le$ [Fe/H] $\le -2.5$范围内的观测趋势。[Cr/Fe] 和 [Mn/Fe] 随着 [Fe/H] 的减少而减少，而 [Co/Fe] 的行为则相反并增加。我们表明，这种行为可以通过作为前身星质量函数的质量截断变化来解释，这提供了来自硅燃烧的富α冻结和不完全硅燃烧的核合成混合变化。这一解释与通过建模单个超新星早期光曲线确定的喷射出的$^{56}$Ni 的量是一致的。我们还建议，晕星的 [H/Fe] 比例主要由与单个超新星喷射物混合的星际氢的质量决定，对于更大的爆炸能量和更大的前身星的 Strömgren 半径来说，这个质量更大。 显示英文摘要

摘要： We explore the effects on nucleosynthesis in Type II supernovae of various parameters (mass cut, neutron excess, explosion energy, progenitor mass) in order to explain the observed trends of the iron-peak element abundance ratios ([Cr/Fe], [Mn/Fe], [Co/Fe] and [Ni/Fe]) in halo stars as a function of metallicity for the range $ -4 \le$ [Fe/H] $\le -2.5$. [Cr/Fe] and [Mn/Fe] decrease with decreasing [Fe/H], while [Co/Fe] behaves the opposite way and increases. We show that such a behavior can be explained by a variation of mass cuts in Type II supernovae as a function of progenitor mass, which provides a changing mix of nucleosynthesis from an alpha-rich freeze-out of Si-burning and incomplete Si-burning. This explanation is consistent with the amount of ejected $^{56}$Ni determined from modeling the early light curves of individual supernovae. We also suggest that the ratio [H/Fe] of halo stars is mainly determined by the mass of interstellar hydrogen mixed with the ejecta of a single supernova which is larger for larger explosion energy and the larger Str\"omgren radius of the progenitor.