CAREER: Evolution of magnetized stars

职业：磁化恒星的演化

• 批准号: 0847477
• 负责人: Pascale Garaud
• 金额: $ 79.48万
• 依托单位: University of California-Santa Cruz
• 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: 2009-08-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0847477&HistoricalAwards=false
• 关键词: CAREER; Evolution; magnetized; stars

Recent observations of our own Sun as well as other stars suggest the need for new approach to modeling stellar evolution, which fully takes into account the inevitably magnetized nature of stars. Dr. Pascale Garaud (University of California - Santa Cruz) will work on the construction of a multidimensional stellar evolution model which takes into account magnetic fields, rotation and all other associated dynamical effects. As a part of this project a new numerical model developed which couples the exact solutions of the nuclear evolution equations to a dynamical magnetohydrodynamic (MHD) model for the internal flows and fields on the larger scales, and a well-tested and experimentally calibrated turbulent MHD closure model for the smaller scales. This new work is a natural extension of Dr. Garaud's ongoing research on the MHD structure of stellar interiors.Dr. Garaud and her collaborators will also launch a yearly international Summer School and Workshop in Astrophysical Fluid Dynamics (AFD). The lecture series will be loosely modeled on the world-renowned Geophysical Fluid Dynamics Summer School hosted by the Woods Hole Oceanographic Institution. The lectures will be focused on teaching students the theoretical (mathematical and computational) tools for certain classes of problems in AFD. A related scientific workshop will be organized at the end of each lecture series inviting this time both theorists and observers, thus completing the program with a state-of-the art dual perspective in the topic studied. The venue will alternate between different partner countries to enhance the international dimension of the program and share organizational costs. The lectures will be published on the web.

最近对我们自己的太阳以及其他恒星的观察表明，需要一种新的方法来模拟恒星的演化，这种方法要充分考虑到恒星不可避免的磁化性质。Pascale Garaud博士（加州大学圣克鲁斯分校）将致力于构建一个多维恒星演化模型，该模型将考虑磁场、自转和所有其他相关的动力学效应。作为该项目的一部分，开发了一个新的数值模型，该模型将核演化方程的精确解与内部流动和场的大尺度动态磁流体动力学（MHD）模型和小尺度的经过充分测试和实验校准的湍流MHD闭合模型耦合在一起。这项新工作是Garaud博士正在进行的关于恒星内部MHD结构的研究的自然延伸。加劳德和她的合作者还将启动一个天体物理流体动力学（AFD）年度国际暑期学校和研讨会。该系列讲座将大致模仿由伍兹霍尔海洋研究所主办的世界著名的地球物理流体动力学暑期学校。讲座将侧重于向学生讲授AFD中某些类别问题的理论（数学和计算）工具。在每个系列讲座结束时，将组织一个相关的科学研讨会，邀请理论家和观察员，从而以最先进的双重视角完成该项目。场地将在不同的合作伙伴国家之间交替进行，以提高项目的国际性，并分担组织成本。讲座将在网上发布。