Dynamics and Chemistry of Star Formation in Magnetic Clouds

磁云中恒星形成的动力学和化学

• 批准号: 0307368
• 负责人: Zhi-Yun Li
• 金额: $ 20.46万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-15 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307368&HistoricalAwards=false
• 关键词: Dynamics; Chemistry; Star; Formation; Magnetic

Proposal ID: AST-0307368Institution: University of VirginiaPI: Li, Zhi-YunMagnetic fields can change the character of star formation fundamentally. The potentially critical role of magnetic fields in star formation has long been recognized, but remains hard to ascertain, because of the difficulty in directly measuring the field strength. This is particularly true for the dense cores of molecular clouds, which are the centers of star formation. Working at the University of Virginia, Dr. Li will carry out a program of research to elucidate the role of magnetic fields in the formation of both single stars and stellar systems. For single stars, he will develop a model for isolated magnetized cloud cores that couples dynamics and chemistry. For stellar systems, he will extend the existing axisymmetric calculations of magnetic cloud evolution driven by ambipolar diffusion to non-axisymmetric cases. These non-axisymmetric calculations will enable a detailed investigation into the role of magnetic fields in cloud fragmentation, which lies at the heart of the problem of stellar system formation. The broader impacts of Dr. Li's program are the training of a graduate student at the University of Virginia and close collaboration between researchers specializing in dynamical simulations and astrochemistry. Successful completion of the program will lead to a better understanding of the birth of stars, a topic that captures the public imagination. Dr. Li will integrate his research results into undergraduate courses and public presentations.

提案ID：AST-0307368机构：弗吉尼亚大学：李，Zhi-yunmagnetic领域可以从根本上改变恒星形成的特征。长期以来，磁场在恒星形成中的潜在关键作用已被认识到，但由于难以直接测量磁场强度，因此仍然难以确定。对于分子云的致密岩心，这是恒星形成的中心。李博士将在弗吉尼亚大学工作，将进行一项研究计划，以阐明磁场在形成单星和恒星系统中的作用。对于单颗恒星，他将开发一个模型，用于伴侣动态和化学的隔离磁化岩心。对于恒星系统，他将扩展由双极扩散驱动到非轴对称病例的磁云进化的现有轴对称计算。这些非轴对称计算将对磁场在云碎片中的作用进行详细研究，这是恒星系统形成问题的核心。 Li博士计划的更广泛的影响是培训弗吉尼亚大学的研究生以及专门研究动态模拟和星体化学的研究人员之间的密切合作。该计划的成功完成将使人们更好地理解恒星的诞生，这是一个捕捉公众想象力的话题。李博士将将他的研究结果纳入本科课程和公开演讲。