Investigating the Evolution of Dwarf Galaxies in the Local Group

研究本星系群中矮星系的演化

• 批准号: 9619460
• 负责人: Tammy Smecker-Hane
• 金额: $ 21万
• 依托单位: University of California-Irvine
• 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: 1997-04-15 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9619460&HistoricalAwards=false
• 关键词: Investigating; Evolution; Dwarf; Galaxies; Local

Smecker-Hane, Tammy 96-19460 Dr. Smecker-Hane and collaborators will determine the star-formation and chemical-evolution histories of dwarf galaxies in the Local Group. They will combine photometry of stars from the tip of the giant branch to well below the main- sequence turnoff with spectroscopic metallicity determinations for a few hundred stars in each of three galaxies. A fourth galaxy will be observed with the Keck 10-m telescope to determine compositions for stars outside of the inner regions of our own Galaxy. The abundance patterns will lead to estimates of how the star-formation rate and gas content evolved. These studies will be combined with new theoretical models and numerical simulations of dwarf galaxies. Comparing the models with the data obtained will lead to fundamental advances in understanding the physical mechanisms that control the evolution of galaxies.

Smecker-Hane，Tammy 96-19460 Smecker-Hane博士和合作者将确定当地组矮星系的星形成和化学进化历史。 它们将将恒星的光度法结合在一起，从巨型分支的尖端到远低于主序列下方的恒星，并在三个星系中的每个星系中对几百个恒星的光谱金属度确定。 将使用Keck 10米望远镜观察第四个星系，以确定我们自己星系内部区域外的恒星的组成。 丰度模式将导致估计恒星形成速率和气体含量如何发展。 这些研究将与矮星系的新理论模型和数值模拟相结合。 将模型与获得的数据进行比较将导致理解控制星系演变的物理机制的基本进步。