Study of Extremely Metal Poor Stars

美国加州理工学院：朱迪思·科恩：《极端贫金属星研究》摘要。加州理工学院的朱迪思·科恩将对金属含量最低的球状星团中的恒星进行详细的丰度分析，并将这些结果与金属含量较高的球状星团的结果进行对比。这项研究的目的是探索在这些星系团中，哪些元素(除了C、N、O、Na、Al和Mg之外)在丰度比上显示出恒星对恒星的差异。这些结果可以用来探索我们银河系的早期，银河系化学演化的开始，在非常早期产生许多元素的可能的恒星源，银河系的年龄，晕场星和银河系球状星团之间的关系，以及ISM和IGM的组成。这些观测也将有助于研究代表高红移宇宙的局部物质中的一般化学丰度。科恩博士在这项工作中与本科生、研究生和博士后的合作将产生更广泛的影响。此外，将在帕洛马尔天文台开展教育和公众宣传，包括为天文台网站开发互动展示和材料。本科生将参与到这项工作中来。

AST-0507219INSTITUTION: California Institute of TechnologyPI: Judith CohenTITLE: "Study of Extremely Metal Poor Stars" ABSTRACTDr. Judith Cohen, at the California Institute of Technology, will undertake a program of detailed abundance analyses for stars in the most metal poor globular clusters, and contrast these to results for more metal rich ones. The purpose of the research is to explore which elements (beyond C, N, O, Na, Al and Mg) show star-to-star differences in abundance ratios in these clusters. These results can be used to probe the early epochs of our Galaxy, the onset of chemical evolution of the Galaxy, the possible stellar sources that produced many elements at very early epochs, the age of the Galaxy, the relationship between the halo field stars and the galactic globular clusters, and the composition of the ISM and the IGM. The observations will also be useful for studies of the general chemical abundances in local material representing the high redshift Universe. Broader impact will result from, Dr. Cohen's work with undergraduates, a graduate student and a postdoc in this effort. Additionally, education and public outreach will be undertaken at Palomar Observatory, including the development of an interactive display and material for the Observatory's website. Undergraduate students will be involved in this effort.