A large, homogeneous open cluster white dwarf sample

大型均匀疏散星团白矮星样本

• 批准号: 0602288
• 负责人: Kurtis Williams
• 金额: $ 6.7万
• 依托单位: Williams Kurtis A
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0602288&HistoricalAwards=false
• 关键词: large; homogeneous; open; cluster; white

AST-0602288Williams, KurtisDr. Williams is awarded an NSF Astronomy and Astrophysics Postdoctoral Fellowship to carry out a program of research and education at the University of Texas-Austin. Dr. Williams will develop and analyze a large sample of open cluster white dwarfs in order to meet the following research goals: (1) to compile a sample of 100 open cluster white dwarfs with progenitor masses greater than 1Msolar, (2) to determine a precise initial-final mass relation using a selected sub-sample of white dwarfs, (3) to determine the lower-mass limit of core-collapse supernova progenitors, (4) to determine the ratio of DB-to-DA (helium-rich-atmosphere to hydrogen-atmosphere) white dwarfs, and (5) to determine the cause of the observed white dwarf deficit in open clusters. These goals will be met through the obtaining of accurate proper motions of stars in open cluster fields to V22, with follow-up spectroscopy on large telescopes to identify and classify the white dwarfs and to determine precise masses and cooling times for the selected sub-sample.Dr. Williams will also participate in an existing continuing-education workshop for science teachers from across the southwestern U.S., with an emphasis on teachers from rural regions in which students are primarily from underrepresented groups and lower-class families. Dr. Williams will also maintain a weblog aimed at explaining astronomy news and research to the general public.

AST-0602288 Williams，KurtisDr.威廉姆斯被授予NSF天文学和天体物理学博士后奖学金，在德克萨斯大学奥斯汀分校开展研究和教育计划。威廉姆斯博士将开发和分析一个大样本的疏散星团白色矮星，以满足以下研究目标：（1）收集100颗母星质量大于1兆太阳质量的疏散星团白色矮星的样本，（2）利用选定的白色矮星子样本确定精确的初始-最终质量关系，（3）确定核心坍缩超新星母星的质量下限，（4）确定DB与DA（富氦大气与氢大气）白矮星的比值;（5）确定疏散星团白矮星亏损的原因。这些目标将通过获得疏散星团中恒星到V22的精确自行来实现，并在大型望远镜上进行后续光谱分析，以识别和分类白色矮星，并确定选定子样本的精确质量和冷却时间。威廉姆斯博士还将参加现有的美国西南部科学教师继续教育研讨会，重点是来自农村地区的教师，那里的学生主要来自代表性不足的群体和下层阶级家庭。威廉姆斯博士还将维护一个旨在向公众解释天文学新闻和研究的博客。