Old Star Clusters: Stellar Activity and Galactic Structure

老星团：恒星活动和银河结构

• 批准号: 0507655
• 负责人: Kenneth Janes
• 金额: --
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2011-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507655&HistoricalAwards=false
• 关键词: Old; Star; Clusters; Stellar; Activity

AST-0507655Kenneth JanesBoston UniversityOld Star Clusters: Stellar Activity and Galactic StructureABSTRACTA long-term program to monitor the activity among main-sequence open-cluster stars in clusters of ages comparable to the Sun (2 to 8 billion years) will be continued. The work is motivated in part towards a better understanding solar activity (past, present, and future): is the current level of activity in the Sun typical of stars of its age? Does activity decline with age? Is the rate of decline in older stars consistent with the dynamo theory for magnetic activity in the Sun? Here the seven year photometric monitoring of photospheric surface activity among main-sequence stars in four cluster (of ages from 2 to 8 billion years) will be continued for another three years using the Perkins Re-Imaging System at the Lowell Observatory. The result will be a database of precision photometry of sun-like stars covering a duration comparable to the solar cycle which may be used to help answer such questions.A companion study with heavy undergraduate involvement will also be undertaken to characterize little studied open clusters in the outer disk of the Galaxy using the same equipment at Lowell. This work will be used to provide targets for future projects. Participation will be open to any undergraduate at Boston University.

波士顿大学旧星星团：恒星活动和银河系结构摘要监测年龄与太阳相当（20亿至80亿年）的星团中主序星疏散星团恒星活动的长期计划将继续进行。这项工作的部分动机是为了更好地了解太阳活动（过去，现在和未来）：太阳目前的活动水平是其年龄的典型恒星吗？活动会随着年龄的增长而下降吗？老恒星的衰减率与太阳磁场活动的发电机理论一致吗？在这里，使用洛厄尔天文台的帕金斯重新成像系统，对四个星系团（年龄从20亿年到80亿年）中的主序恒星的光球表面活动进行为期七年的光度监测将再持续三年。其结果将是一个覆盖与太阳周期相当的时间的类日恒星精密测光数据库，可用于帮助回答这些问题。一个有大量大学生参与的同伴研究也将使用洛厄尔的相同设备进行，以表征研究很少的银河系外盘疏散星团。这项工作将用于为今后的项目提供目标。参与将开放给波士顿大学的任何本科生。