Angular Momentum Evolution and the Origin of Rotation in Stars

角动量演化和恒星旋转的起源

• 批准号: 0206008
• 负责人: Marc Pinsonneault
• 金额: $ 15.93万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-15 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206008&HistoricalAwards=false
• 关键词: Angular; Momentum; Evolution; Origin; Rotation

PI PinsonneaultThere has been extensive recent observational and theoretical work on the angularmomentum evolution of low mass stars. The initial distribution of protostellar rotation rates can provide clues about the star formation process and the interaction of T Tauri stars with their circumstellar accretion disks. Rotation is intimately connected with the generation of stellar magnetic fields, and the spindown of stars can be used to study angular momentum loss from a magnetized stellar wind. Internal transport of material and of angular momentum has several sources (hydrodynamic, magnetic, and induced by gravity waves); this transport produces mixing that can strongly modify the surface abundances of stars. The sheer variety of physical effects associated with stellar rotation makes the subject complex. Fortunately, there are numerous observational constraints on theoretical models of angular momentum evolution, and recent work has established a theoretical framework for interpreting these data. This study is a combined theoretical and observational program on stellar rotation. The goals of this work are to improve the physics in models of angular momentum evolution and to provide new calibrating data for the models. ***

最近对低质量恒星的角质膜演化进行了广泛的观测和理论研究。原恒星自转速度的初始分布可以提供恒星形成过程的线索，以及T-Tauri星与其星周吸积盘的相互作用。自转与恒星磁场的产生密切相关，恒星的自旋可以用来研究磁化恒星风的角动量损失。物质和角动量的内部传输有几个来源(流体、磁力和重力波诱导的)；这种传输产生的混合可以强烈地改变恒星的表面丰度。与恒星自转相关的各种物理效应使这一主题变得复杂。幸运的是，角动量演化的理论模型存在大量的观测约束，最近的工作已经建立了解释这些数据的理论框架。这项研究是一个关于恒星自转的理论和观测相结合的项目。这项工作的目的是改进角动量演化模型的物理性质，并为模型提供新的定标数据。***