U.S.-Denmark Cooperative Research: Spectroscopy and Analysis of Horizontal-Branch and A-Type Stars in the Galactic Halo

9213548比尔斯该奖项支持密歇根州立大学的Timothy Beers教授和一名研究生与丹麦哥本哈根大学Niels Bohr研究所的Jesper Sommer-Larsen博士在天文学研究方面的合作。他们的研究目的是获得广泛的新的光谱观测的场水平分支（FHB）和明显的主序A星在银河系的光晕。这些数据将允许对这类恒星的运动学进行明确的研究，而不受目前小数量统计和运动学选择偏差的限制。讨论和改进Vedel和Sommer-Larsen的运动学和动力学模型是合作项目的另一个重要方面。这项研究解决了关于星系晕和盘系统的动力学和化学历史的基本问题。研究结果将促进我们对银河系历史的理解。这一合作安排将大大增加美国研究人员使用欧洲南方天文台的望远镜观测时间。＊＊＊

9213548 Beers This award supports Professor Timothy Beers and a graduate student of Michigan State University to collaborate in astronomical research with Dr. Jesper Sommer-Larsen of the Niels Bohr Institute of the University of Copenhagen, Denmark. The objective of their research is to obtain extensive new spectroscopic observations of Field Horizontal Branch (FHB) and apparent Main-Sequence A stars in the halo of the Galaxy. These data will allow for a definitive study of the kinematics of such stars without the present limitations of small number statistics and kinematic selection bias. Discussion and refinement of the kinematic and dynamical models of Vedel and Sommer-Larsen are other important aspects of the collaborative project. This research addresses fundamental questions about the dynamic and chemical history of the galactic halo and disk system. Results should advance our understanding of the history of the galaxy. The collaborative arrangement will significantly increase the telescope observing time available to the U.S. researchers by providing access to the European Southern Observatory. ***