论文标题
富含磷的恒星具有不寻常的丰度
Phosphorus-rich stars with unusual abundances are challenging theoretical predictions
论文作者
论文摘要
几乎所有化学元素都是由各种恒星中的核合成反应制成的，并沿着我们的宇宙历史积累。在这些元素中，磷的起源引起了极大的兴趣，因为它对我们在地球上所知的生命至关重要。然而，当前（银河化学演化的化学演化低预测模型我们在太阳系中观察到的磷。在这里，我们报告了15个富含磷的恒星，其含有异常的O，MG，SI，AL和CE。富含磷的恒星很可能从附近的另一个恒星来源继承其特殊的化学反应，但是它们有趣的化学丰度模式挑战了当前的恒星核合成理论预测。巨大恒星中对流反应区域中旋转或晚期核合成等特定效应是解释富含磷富含磷的恒星存在的最有希望的替代方法。富含磷的恒星祖细胞可能会显着有助于当今地球上存在的磷。
Almost all chemical elements have been made by nucleosynthetic reactions in various kind of stars and have been accumulated along our cosmic history. Among those elements, the origin of phosphorus is of extreme interest because it is known to be essential for life such as we know on Earth. However, current models of (Galactic) chemical evolution under-predict the phosphorus we observe in our Solar System. Here we report the discovery of 15 phosphorus-rich stars with unusual overabundances of O, Mg, Si, Al, and Ce. Phosphorus-rich stars likely inherit their peculiar chemistry from another nearby stellar source but their intriguing chemical abundance pattern challenge the present stellar nucleosynthesis theoretical predictions. Specific effects such as rotation or advanced nucleosynthesis in convective-reactive regions in massive stars represent the most promising alternatives to explain the existence of phosphorus-rich stars. The phosphorus-rich stars progenitors may significantly contribute to the phosphorus present on Earth today.
