超新星前身模型的银河系约束
Galactic Constraints on Supernova Progenitor Models
摘要：
我们进行了统计分析的径向丰度分布在银河系的化学演化，其中包括螺旋臂的影响的理论框架内的银河系盘。1)每次核心坍缩SNe事件喷出的平均氧气质量（CC SNe）（集中在旋臂内）为$\sim$ 0.27 M $_{\odot}$ ; 2）由“迟缓”Ia型SNe喷出的铁的平均质量（SNeIa;它们的祖先是年龄在$\simgt$ 1亿年到几个Gyr之间的较老/寿命较长的恒星，其不集中在螺旋臂内）是$\sim$ 0.58 M $_{\odot}$ ; 3）由瞬发SNeIa喷出的上层铁物质（SNe的祖先是年龄为$\simlt$ 1亿年的较年轻/寿命较短的恒星，4）由CC SNe产生的铁的相应平均质量为$\leq$ 0.04 M $_{\odot}$/事件;（v）短寿命的SNe（核心坍缩或瞬发SNeIa）提供了银河系圆盘$\sim$ 85%的铁。推断出的每一次CC SNe事件喷出的氧的平均质量较低，这意味着$\sim$ 23 M $_{\odot}$的相应祖先的质量上限较低，否则银河系盘中的氧将过于丰富。相对于缓慢SNeIa产生的质量（$\sim$低2.5倍），快速SNeIa喷出的铁的平均质量较低，这使SNeIa的两个亚群具有相同的物理性质的观点受到偏见。我们认为，提示SNeIa可能更类似于CC SNe，并讨论了这样的建议的含义。
英文摘要：
We undertake a statistical analysis of the radial abundance distributions in the Galactic disk within a theoretical framework for Galactic chemical evolution which incorporates the influence of spiral arms. 1) The mean mass of oxygen ejected per core-collapse SNe (CC SNe) event (which are concentrated within spiral arms) is $\sim$0.27 M$_{\odot}$; 2) the mean mass of iron ejected by `tardy' Type Ia SNe (SNeIa; progenitors of whom are older/longer-lived stars with ages $\simgt$100 Myr and up to several Gyr, which do not concentrate within spiral arms) is $\sim$0.58 M$_{\odot}$; 3) the upper mass of iron ejected by prompt SNeIa (SNe whose progenitors are younger/shorter-lived stars with ages $\simlt$100 Myr, which are concentrated within spiral arms) is $\leq$0.23 M$_{\odot}$ per event; 4) the corresponding mean mass of iron produced by CC SNe is $\leq$0.04 M$_{\odot}$ per event; (v) short-lived SNe (core-collapse or prompt SNeIa) supply $\sim$85% of the Galactic disk's iron. The inferred low mean mass of oxygen ejected per CC SNe event implies a low upper mass limit for the corresponding progenitors of $\sim$23 M$_{\odot}$, otherwise the Galactic disk would be overabundant in oxygen. The low mean mass of iron ejected by prompt SNeIa, relative to the mass produced by tardy SNeIa ($\sim$2.5 times lower), prejudices the idea that both sub-populations of SNeIa have the same physical nature. We suggest that, perhaps, prompt SNeIa are more akin to CC SNe, and discuss the implications of such a suggestion.
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