Stellar Spectroscopy and Nucleosynthesis

恒星光谱学和核合成

• 批准号: 9618414
• 负责人: David Lambert
• 金额: $ 22.18万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 2000-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9618414&HistoricalAwards=false
• 关键词: Stellar; Spectroscopy; Nucleosynthesis

Lambert, David AST 96-18414 Dr. Lambert and collaborators will carry out a diverse array of investigations into the chemical abundances of stars that will provide insieht into the processes of stellar nucleosynthesis and galactic chemical evolution. The wide variety of projects includes investigations of nearby F and G dwarfs to define the age and spatial dependence of chemical compositions at intermediate metallicities where sharp transitions in abundance patterns are seen, determination of Mg isotopic abundances that have the potential to constrain models of supernovae, observations directed at illuminating the nature of the s-process operating in late-type AGB stars, and the exploration of several groups of stars that present chemical 'puzzles.' Many of the projects build on previous results of the PI and collaborators, and a number of observations intend to make use of the new IR spectroscopic instrumentation available at national facilities and new instrumentation at the Hobby-Eberly Telescope. ***

兰伯特博士和合作者将对恒星的化学丰度进行一系列不同的调查，这将为恒星核合成和星系化学演化的过程提供深入的了解。各种各样的项目包括对附近的F和G矮星的研究，以确定中间金属丰度的化学成分的年龄和空间依赖性，在丰度模式中可以看到急剧的转变，确定Mg同位素丰度，有可能约束超新星模型，旨在阐明在晚期AGB恒星中运行的s过程的性质的观测，以及对几组存在化学“谜题”的恒星的探索。许多项目建立在PI和合作者以前的成果基础上，许多观测打算利用国家设施和霍比-埃伯利望远镜上的新仪器所提供的新的红外光谱仪器。＊＊＊