Modeling Stellar Exotica in Dense Star Clusters

稠密星团中的奇异恒星建模

• 批准号: 0507561
• 负责人: James Lombardi
• 金额: $ 17.76万
• 依托单位: Vassar College
• 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: 2005-09-01 至 2006-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507561&HistoricalAwards=false
• 关键词: Modeling; Stellar; Exotica; Dense; Star

AST-0507561James LombardiVassar CollegeModeling Stellar Exotica in Dense Star ClustersABSTRACTA collaborative project between Vassar College and Northwestern University will be undertakenwhich will explore the effects of magnetic fields during close interactions between stars as are likelyto take place frequently in dense stellar environments (e.g., the cores of globular clusters). Suchinteractions not only determine the fate of these clusters but are also believed to be the origin ofexotic objects such as blue stragglers, binary pulsars, and x-ray sources. The investigators andstudents at Vassar will use a 3D smoothed particle hydrodynamics code developed under previousNSF funding and complete its adaptation to include magnetic fields (a 3D smoothed particlemagnetohydrodynamic code). This new tool will then be used to simulate stellar collisions/mergersamong a variety of types of stars (main-sequence, subgiant, red giant, and stellar remnants).Specific topics that will be addressed include stellar collisions in globular clusters (and the originsof blue stragglers, i.e., collisions versus mergers), binary mergers, and common envelope evolution.Included in this project is significant involvement by students with the goal of setting up self -sustaining student research programs (in which new students are trained by seniors). There is alsothe opportunity for students at either school to become involved in collaborations withstudents/postdoctoral fellows/faculty at the other. Likewise, useful skills in programming,modeling, hydrodynamics/fluid mechanics, etc., will be developed among the participants.

摘要瓦萨学院和西北大学将进行一个合作项目，该项目将探索恒星之间密切相互作用期间磁场的影响，这种相互作用可能经常发生在密集的恒星环境中（例如，球状星团的核心）。这种相互作用不仅决定了这些星团的命运，而且被认为是外来物体的起源，如蓝离散星、双星脉冲星和x射线源。瓦萨的研究人员和学生将使用在以前的nsf资助下开发的3D平滑粒子流体力学代码，并完成对其进行调整，以包括磁场（3D平滑粒子磁流体力学代码）。然后，这个新工具将用于模拟各种类型恒星（主序星、亚巨星、红巨星和恒星残骸）之间的恒星碰撞/合并。将讨论的具体主题包括球状星团中的恒星碰撞（以及蓝离散星的起源，即碰撞与合并）、双星合并和共同包层演化。这个项目包含了学生的大量参与，目标是建立自给自足的学生研究项目（在这个项目中，新生由高年级学生培训）。两所学校的学生都有机会与另一所学校的学生/博士后研究员/教师合作。同样，在编程，建模，流体力学/流体力学等方面的有用技能将在参与者中得到发展。