Collaborative Research: Open Clusters at the Interface of Stellar Evolution and Stellar Dynamics

合作研究：恒星演化与恒星动力学界面的疏散星团

• 批准号: 0908082
• 负责人: Robert Mathieu
• 金额: $ 67.82万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908082&HistoricalAwards=false
• 关键词: Collaborative; Research; Open; Clusters; Interface

Astronomers have long used stellar clusters to learn about the orbital motions of stars in bound groups and as laboratories for testing ideas of star formation and stellar evolution. The two fields of dynamics and stellar evolution have developed independently, but with advances in detector technology and computing speed, it is now possible to integrate these two areas of research.In this collaborative study, Dr. Robert Mathieu (University of Wisconsin - Madison) and Dr. Imants Platais (Johns Hopkins University) will undertake a series of observational and theoretical investigations to address several outstanding questions in stellar evolution and dynamics. The first objective is to obtain a comprehensive census of the single star and binary star populations in seven rich open clusters which have ages from 100 million to 7 billion years. This will be accomplished through precise measurements of minute apparent tangential motions and multi-epoch measurements of radial velocities. These data will provide highly reliable three-dimensional kinematic membership determinations for the entire evolved cluster population. The second objective is to characterize the populations of nearly 100 blue stragglers and other newly discovered anomalous stars in these clusters, focusing on their binary, rotation and stellar activity distributions. The third objective is to compute an array stellar motion simulations for open clusters with initial conditions, especially the binary population, guided by observations of young stellar clusters. The simulations will be performed in collaboration with Dr. J. Hurley (Swinburne, Australia), and Dr. A. Sills (McMaster, Canada) will collaborate on the production of anomalous stars through collisions. The union of comprehensive rotational, stellar activity and binary data for a large set of anomalous stars of different ages and masses will allow new insights on formation mechanisms, internal structures, and ages of these stars at the interface of stellar dynamics and stellar evolution.The research plan will have a broader impact through enhancement of the research and teaching skills of future astronomers, both within and beyond the borders of the United States. This research will include students and a postdoctoral fellow, and is expected to yield three graduate dissertations, several undergraduate theses, and research experiences of summer undergraduate students. This work will be associated with the Center for the Integration of Research, Teaching, and Learning, an NSF Center for Learning and Teaching directed by Mathieu. Platais, through his association with the trilateral Taiwan-Baltic collaboration, will assist in the education, training and research of students and young researchers in recently disadvantaged countries that have fast developing infrastructure and intellectual potential.

长期以来，天文学家已经使用出色的群集来学习界限中恒星的轨道运动，并作为测试恒星形成和恒星进化思想的实验室。 动态和恒星进化的两个领域已经独立发展，但是随着探测器技术和计算速度的进步，现在有可能整合这两个研究领域。在这项合作研究中，罗伯特·马蒂乌（Robert Mathieu）（威斯康星大学 - 麦迪逊大学 - 麦迪逊大学）和Imants Platais Platais（Johns Hopkins University）将进行一系列观察和动态的研究，并在启动中进行了一些出色的问题，并在此方面进行了一些杰出的问题。 第一个目标是在七个富裕的开放式群集中获得一颗恒星和二元星人口的全面人口普查，这些群集的年龄从1亿至70亿年。 这将通过精确测量对径向速度的微小明显切向运动和多个周期测量来实现。这些数据将为整个进化的群集种群提供高度可靠的三维运动构件确定。第二个目标是表征这些簇中近100个蓝色散落者和其他新发现的异常恒星的种群，重点是它们的二进制，旋转和恒星活动分布。 第三个目标是针对具有初始条件的开放簇计算阵列恒星运动模拟，尤其是二元人口，以对年轻恒星簇的观察为指导。 这些模拟将与J. Hurley博士（澳大利亚Swinburne）合作进行，而A. Sills博士（加拿大麦克马斯特）将通过碰撞来合作生产异常恒星。在恒星动力学和恒星进化计划的界面上，这些恒星的综合旋转，恒星活动和二进制数据的全面旋转，恒星活动和二进制数据将允许对这些恒星的形成机制，内部结构和年龄进行新的见解。该研究计划将通过增强未来的群体和教学能力来增强未来的群体和教学能力，并在未来的群体中增强群体的影响。这项研究将包括学生和一名博士后研究员，并有望产生三个研究生论文，几个本科论文以及夏季本科生的研究经历。 这项工作将与Mathieu指导的NSF学习和教学中心研究，教学和学习的整合中心有关。 Platais通过与三边台湾 - 巴特尔（Taiwan-Baltic）合作的联系，将帮助最近处于弱势国家的学生和年轻研究人员的教育，培训和研究，这些国家具有快速发展基础设施和智力潜力。