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

9213548啤酒该奖项支持蒂莫西·比尔斯教授和密歇根州立大学的一名研究生与丹麦哥本哈根大学尼尔斯·玻尔研究所的Jesper Sommer-Larsen博士在天文学研究方面进行合作。他们研究的目的是获得对星系晕中的视场水平分支(FHB)和视主序A星的广泛的新的光谱观测。这些数据将允许对这类恒星的运动学进行明确的研究，而不会受到目前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其他重要方面。这项研究解决了有关银河晕和盘系统的动力学和化学史的基本问题。结果应该会促进我们对银河系历史的理解。这一合作安排将为美国研究人员提供进入欧洲南方天文台的通道，从而显著增加美国研究人员的望远镜观测时间。***

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. ***