High Resolution Spectroscopy of the Galactic Halo

银河晕的高分辨率光谱

• 批准号: 9618364
• 负责人: Christopher Sneden
• 金额: $ 21.01万
• 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: 1997-02-01 至 2001-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9618364&HistoricalAwards=false
• 关键词: Resolution; Spectroscopy; Galactic; Halo

96-18364 Sneden, Christopher Dr. Sneden will carry out a diverse program of research into fundamental issues of stellar nucleosynthesis and the early chemical evolution of the Milky Way Galaxy by obtaining highresolution spectroscopy of key stellar populations in the Galaxy's halo. Galactic halo objects possess richly varied chemical compositions, which provide fundamental clues to early chemical and dynamical evolution. The signature of abundances of very heavy elements in the most metaldeficient stars reveal the nature of the first generation of Galactic supernovae; the abundance of light elements in globular cluster stars indicate complex hydrogen nucleosynthesis and internal mixing in stellar interiors;the interstellar absorption features on lines of sight toward stars in the halo map out large interstellar clouds in the Galactic halo. Among the most interesting of Dr. Sneden's work will be studies of the element Thorium, which holds the potential to provide an estimate of the age of the Galaxy. ***

96-18364斯内登，克里斯托弗·斯内登博士将通过获得银河系光晕中关键恒星群的高分辨率光谱，对恒星核合成和银河系早期化学演化的基本问题进行多样化的研究。银河晕天体具有丰富多样的化学成分，这为早期的化学和动力学演化提供了基本线索。最缺乏金属的恒星中非常重元素丰度的特征揭示了第一代银河系超新星的本质；球状星团恒星中的轻元素丰度表明恒星内部复杂的氢核合成和内部混合；在光晕中恒星的视线上的星际吸收特征描绘出银河光晕中的大片星际云。斯奈登博士最感兴趣的工作之一将是对钍元素的研究，这种元素有可能提供银河系年龄的估计。***