White Dwarfs in Open Clusters

疏散星团中的白矮星

• 批准号: 0307492
• 负责人: Michael Bolte
• 金额: --
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2008-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307492&HistoricalAwards=false
• 关键词: White; Dwarfs; Open; Clusters

AST 0307492Bolte, Michael J.The investigators in this project are carrying out an extensive search for white dwarf stars in young open clusters with the primary goal to identify the main sequence stellar mass above which stars explode as core collapse supernovae and below which stars end their lives as white dwarfs. The value for this critical mass is important in a wide range of areas. The number of core-collapse supernovae in a stellar population has important implications for chemical enrichment and energy balance in galaxies. Supernovae kinetic energy feedback may be the dominant process in the early evolution of dwarf galaxies and is an important mechanism for regulating star formation in young galaxies of all masses. The current uncertainty in the value of the critical mass is large with values in the recent literature ranging from 5 to 8 solar masses. Identifying the critical mass for the formation of white dwarfs is also important for providing constraints on physical processes in giant stars that lead to the formation and growth of the core that eventually becomes thewhite dwarf remnant. A valuable side benefit of this program is improved estimates of the ages, distances and initial mass functions of a number of young and intermediate-age open clusters. Broader Impact. The researchers are making their data and analysis tools available freely at a WWW site during the course of the work. Astronomy and physics graduate and undergraduate students are involved in the research.

AST 0307492 Bolte，Michael J.这个项目的研究人员正在年轻的疏散星团中进行广泛的白色矮星搜索，主要目标是确定主序恒星质量，高于该质量的恒星爆炸为核心坍缩超新星，低于该质量的恒星结束生命为白色矮星。这一临界质量的价值在许多领域都很重要。恒星群中核心坍缩超新星的数量对星系中的化学富集和能量平衡具有重要意义。超新星动能反馈可能是矮星系早期演化的主导过程，也是调节各种质量年轻星系中星星形成的重要机制。目前临界质量值的不确定性很大，最近文献中的数值从5到8个太阳质量不等。确定形成白色矮星的临界质量对于限制巨星中导致最终成为白色矮星残骸的核心形成和增长的物理过程也很重要。该计划的一个有价值的副作用是改进了对一些年轻和中年疏散星团的年龄，距离和初始质量函数的估计。更广泛的影响。研究人员在工作过程中在万维网网站上免费提供他们的数据和分析工具。天文学和物理学研究生和本科生参与了这项研究。