The Chemistry of the Galactic Halo

AST-0607708机构：德克萨斯大学奥斯汀分校PI：Christopher Sneden标题：银河系晕的化学。德克萨斯大学奥斯汀分校的克里斯托弗·斯内登（Christopher Sneden）将开展一项计划，其基本目标是为银河系化学演化理论家提供银河系晕星重要类别的详细和准确的化学成分。 这一目标将在两个一般项目中实现：1）在相对较小的恒星样本中精确测定几种关键的超重元素的丰度，这些元素是在与超新星爆炸有关的事件中通过目标种子核捕获的中子的短寿命快速爆发而产生的;和2）大样本丰度调查最低的金属晕星，和恒星，显示过去的质量转移插曲从他们的双同伴的证据。 此外，Sneden博士和合作者将扩大一个正在进行的计划，该计划将实验室和太阳/恒星丰度调查结合起来，对选定元素的天文学可观察特征进行调查。 将特别注意那些对早期银河系化学成分调查研究最感兴趣的中性和电离物种，这项工作的更广泛影响包括继续开发、改进和向全世界恒星光谱学家社区传播计算机代码和原子/分子谱线数据。 此外，研究和课程开发与公共宣传之间的联系将产生，Sneden博士将积极参与正在进行的一系列中学教育工作者研讨会。

AST-0607708INSTITUTION: University of Texas at AustinPI: Christopher SnedenTITLE: The Chemistry of the Galactic HaloABSTRACTDr. Christopher Sneden, at the University of Texas at Austin, will undertake a program that has as its basic goal providing Galactic chemical evolution theorists with detailed and accurate chemical compositions of important classes of Galactic halo stars. The goal will be addressed in two general projects: 1) Precise abundance determinations in relatively small stellar samples of several key very heavy elements that are manufactured via short-lived, rapid bursts of neutrons captured by target seed nuclei in event(s) associated with supernova explosions; and 2) Large-sample abundance surveys of lowest-metallicity halo stars, and of stars that show evidence for past mass-transfer episodes from their binary companions. Additionally, the Dr. Sneden and collaborators will expand an ongoing program combining laboratory and solar/stellar abundance investigation of astronomically observable features of selected elements. Special attention will be paid to those neutral and ionized species of greatest interest to research on early Galactic chemical composition surveys.Broader impacts of the work include the continued development, refinement, and web-dissemination of computer codes and atomic/molecular line data to the worldwide community of stellar spectroscopists. Additionally, connections between research and course development and public outreach will result, and Dr. Sneden will be an active participant in an ongoing series of seminars to secondary school educators.