The Chemical Compositions of Galactic Halo Field and Cluster Stars

该奖项是根据2009年《美国复苏和再投资法案》(公法111-5)资助的。为了阐明和约束银河系早期化学演化模型，将对银河系场晕恒星进行两次重大调查。其中一项是对100多颗已知空间运动和金属度低于太阳1/300的恒星的高分辨率光谱进行详细研究，目的是发现恒星的丰度趋势和运动学特性。第二个是使用大约10个球状星团的多目标光谱，对非常进化的所谓水平分支恒星进行全面的调查。该计划的更广泛影响包括向天文学社区传播计算机代码和原子线数据，以及参与一项涉及中学教师的计划。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Two major surveys of Galactic field halo stars will be carried out in order to illuminate and constrain models of early chemical evolution in the Milky Way Galaxy. In one, a detailed study of high resolution spectra of over 100 stars with known space motions and metallicities less than 1/300 that of the sun will be undertaken, with the goal of discovering abundance trends with kinematic properties of the stars. The second is a comprehensive survey of very evolved so-called horizontal branch stars using multi-object spectra of about 10 globular clusters. The Broader Impacts of this program include dissemination of computer codes and atomic line data to the astronomical community, and participation in a program involving secondary school teachers.