Rotating Rates of Late-Type Stars in Open Clusters 300Myr-1Gyr Old

300Myr-1Gyr 疏散星团中晚型恒星的自转速率

• 批准号: 0520925
• 负责人: Sydney Barnes
• 金额: --
• 依托单位: Lowell Observatory
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-31 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0520925&HistoricalAwards=false
• 关键词: Rotating; Rates; Late; Type; Stars

9986962 Dr. Barnes will undertake an extensive survey of nearby stellar clusters whose goal is to determine the dependence of rotation rate on stellar mass and age. The rotation periods will be determined for solar-type stars in carefully selected clusters with ages ranging from 300 million years to 1 billion years using photometric observations with a precision of better than one percent. The observational results will be compared to models for the rotational evolution of stars, not only with respect to age and mass, but also to other properties such as the degree of interaction between stars and their circumstellar disks. This project is likely to provide new insight into the role of magnetic disk locking between slow and fast rotation zones, the incidence of solid versus differential rotation, and magnetic saturation. These issues directly contribute to our understanding of the interplay between the Sun's rotation and activity level. Funding for this project is provided by the NSF program for Stellar Astronomy & Astrophysics (AST/SAA).

9986962巴恩斯博士将对附近的星团进行广泛的调查，目的是确定旋转速率与恒星质量和年龄的关系。太阳型恒星的旋转周期将在精心挑选的星团中确定，这些星团的年龄从3亿年到10亿年不等，使用精度超过1%的光度观测。观测结果将与恒星旋转演化的模型进行比较，不仅在年龄和质量方面，而且在其他属性方面，如恒星与其星周盘之间的相互作用程度。该项目可能会对磁盘锁定在慢速和快速旋转区域之间的作用、固体旋转与微分旋转的发生率以及磁饱和提供新的见解。这些问题直接有助于我们理解太阳的旋转和活动水平之间的相互作用。本项目由美国国家科学基金会恒星天文学和天体物理学项目（AST/SAA）提供资金。