Galactic Chemical Evolution Through High Resolution Spectroscopy

派：SnedenAST-0307495德克萨斯大学，奥斯汀博士。斯内登将进行光谱研究，探索银河系早期的化学演化。他的计划关注的是银河系中最缺乏金属的恒星，这些恒星的化学丰度可以最好地洞察银河系的形成和演化，以及恒星核合成和演化的细节。对低金属丰度厚盘和晕群的关键样本进行高分辨率光谱分析的大型计划将使我们能够将晕星的化学成分与现在建议与厚盘有关的类似金属丰度恒星的化学成分进行比较，扩大具有明确确定的详细丰度分布的极端贫金属星的数量，并在双蓝贫金属星中创建具有统计意义的丰度样本。他还将对几个外晕球状星系团进行丰度分析，这些星系团还没有像更近的星系团那样被彻底研究。在这项工作中，他将探索将法布里-珀罗成像用于非常大的星系团丰度研究样本。他的许多活动都将产生广泛的影响。他将继续与威斯康星大学的原子物理学小组合作，将实验室和太阳丰度研究结合起来，对选定的元素进行研究。他将继续开发并向社区提供他广泛使用的软件和线条列表数据。他将参加为中学教师举办的一系列研讨会，特别是带领他们参加麦当劳天文台的工作坊。

PI: SnedenAST-0307495University of Texas, AustinDr. Sneden will carry out spectroscopic studies that explore the early chemical evolution of the Milky Way galaxy. His program focuses on the most metal-deficient stars of the Galaxy, those whose chemical abundances can yield the most insight into both the formation and evolution of the Galaxy and the details of stellar nucleosynthesis and evolution. A large program of high resolution spectroscopy of key samples of low metallicity thick disk and halo populations will allow a comparison of the chemical composition of halo stars with those of similar metallicity now proposed to be associated with the thick disk, an expansion of the number of extremely metal-poor stars that have well-determined detailed abundance distributions, and the creation of a statistically meaningful sample of abundances in binary blue metal-poor stars. He will also carry out abundance analyses of several outer halo globular clusters, a population that has not been studied as thoroughly as the more nearby clusters. In this work, he will explore the use of Fabry-Perot imaging for very large samples of cluster abundance studies. Many of his activities will have broad impact. He will continue his collaboration with the atomic physics group at the University of Wisconsin to combine lab and solar abundance studies of selected elements. He will continue to develop and to make available to the community his widely used software and linelist data. He will participate in a series of seminar for secondary school teachers, particularly in leading them in workshops at the McDonald Observatory.***