Accretion and Outflows of Rotating Magnetized Stars

旋转磁化恒星的吸积和流出

• 批准号: 0607135
• 负责人: Richard Lovelace
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-15 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607135&HistoricalAwards=false
• 关键词: Accretion; Outflows; Rotating; Magnetized; Stars

This research centers on accretion and outflow in rotating stars with magneticfields. Examples of such objects include young T Tauri stars, white dwarfs in cataclysmicvariables, and neutron stars in various binary systems. Here, a theoretical andcomputational effort will be undertaken in which advanced modeling codes, including a3D program using a cubed sphere numerical grid, will be used to investigate accretionand outflow processes among such stars. Specific goals are to: (1) Better understand howdisk material interacts with stellar magnetospheres, and which instabilities areresponsible for launching the disk matter to the magnetic field lines of the star. (2) Toexplore how the multipolar structure of a stellar magnetosphere influences the accretionprocess. And (3) to determine what is the dominant mechanism of launching outflowsfrom magnetized stars.The techniques and numerical methods developed here will also have general value andare applicable in other areas of science like planetary science, geophysics, earthmagnetospheric science, heliospheric science, and in engineering. Young scientists(including undergraduates and graduate students) will be trained inmagnetohydrodynamics. A research associate will also be supported who, in addition toworking closely with the Principle Investigators, will aid in the education of students.Results from this work will be incorporated into the groups outreach programs, includingand exhibit at the local Science Center and in an outreach program being developed forschool children and teachers.

本研究以磁场作用下旋转恒星的吸积和流出为中心。这类天体的例子包括年轻的金牛座T星，激变中的白矮星，以及各种双星系统中的中子星。在这里，将进行理论和计算方面的努力，其中将使用先进的建模代码，包括使用立方球数值网格的3d程序，来研究这些恒星之间的吸积和流出过程。具体目标是：(1)更好地了解磁盘物质如何与恒星磁球相互作用，以及哪些不稳定性负责将磁盘物质发射到恒星的磁力线。(2)探索恒星磁层多极结构对吸积过程的影响。(3)确定从磁化恒星发射流出物的主要机制是什么。这里发展的技术和数值方法也将具有普遍价值，并适用于其他科学领域，如行星科学、地球物理学、地球磁层科学、日球层科学和工程。青年科学家（包括本科生和研究生）将接受磁流体力学方面的培训。研究助理除了与主要研究人员密切合作外，还将协助学生的教育。这项工作的成果将被纳入小组的外展计划，包括在当地科学中心展出，以及为学校儿童和教师制定的外展计划。