Membership, Rotation, Activity, and Lithium Abundances in a Selection of Nearby Clusters

选定的附近簇中的成员资格、轮换、活性和锂丰度

• 批准号: 0307585
• 负责人: Burton Jones
• 金额: $ 5.04万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-15 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307585&HistoricalAwards=false
• 关键词: Membership; Rotation; Activity; Lithium; Abundances

AST 0307585Jones, Burton F.This project will expand our knowledge of how stars like the Sun evolve by obtaining membership information for stars in nearby star clusters. Observations of star clusters have long provided the best link to theories of stellar structure and evolution. Stellar models of a given mass, composition, and age predict luminosity and effective temperature (color). Under the reasonable assumption that all stars in a cluster are the same age and chemical composition, cluster color versus magnitude diagrams provide templates against which the luminosity and effective temperature of stellar models can be compared. Lick Observatory has a collection of first epoch glass plate negatives of open star clusters taken around 1970 with the 36 inch refractor. Over the last three years second epoch plates of 11 nearby clusters were taken. The second epoch photography of these clusters, and 4 more clusters, is being completed. Suitable plate measurements are then used to determine proper motions for stars in the clusters and thence membership probability estimates for individual stars. Spectroscopic observations will be obtained of member stars in several of the clusters for the determination of abundances, stellar activity, and rotation. This database will be used by the PI and others toward a better understanding of the evolution of stellar activity, lithium abundance, and rotation in solar type stars different ages and metallicities. Broader Impacts. This research will produce a database with importance for studies of the mass and luminosity functions and the dynamical evolution of open star clusters, and will also be of use to spectroscopic observers who want to observe cluster members at high dispersion. This database will be made freely available. This grant supports collaboration with astronomers in Germany and at the Space Telescope Science Institute.

AST 0307585Jones，Burton F。该项目将通过获取附近星团中恒星的成员信息来扩展我们对像太阳这样的恒星如何演化的了解。长期以来，对星团的观测一直为恒星结构和演化理论提供了最佳联系。给定质量、成分和年龄的恒星模型可以预测光度和有效温度（颜色）。在星团中所有恒星具有相同年龄和化学成分的合理假设下，星团颜色与星等图提供了可以比较恒星模型的光度和有效温度的模板。利克天文台收藏了 1970 年左右使用 36 英寸折射镜拍摄的第一代疏散星团玻璃底片。 在过去三年中，拍摄了附近 11 个星团的第二纪元板块。这些星团以及另外 4 个星团的第二次拍摄正在进行中。然后使用合适的板测量来确定星团中恒星的自行运动，从而估计单个恒星的隶属概率。将对几个星团中的成员恒星进行光谱观测，以确定丰度、恒星活动和旋转。 PI 和其他人将使用该数据库来更好地了解不同年龄和金属丰度的太阳型恒星的恒星活动、锂丰度和旋转的演化。更广泛的影响。这项研究将产生一个对于研究疏散星团的质量和光度函数以及动力学演化具有重要意义的数据库，并且对于想要观察高色散星团成员的光谱观测者也将很有用。该数据库将免费提供。 这笔赠款支持与德国和太空望远镜科学研究所的天文学家的合作。