Stellar Kinematics and Stellar Populations in the Galactic Center

银河系中心的恒星运动学和恒星种群

• 批准号: 9115236
• 负责人: Kristen Sellgren
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115236&HistoricalAwards=false
• 关键词: Stellar; Kinematics; Populations; Galactic; Center

Dr. Sellgren will study the stellar kinematics and stellar populations in the central few parsecs of our Galaxy. Her main objective is to determine if a massive black hole is present. Its mass will depend on the difference between the total mass distribution and the stellar mass distribution inferred from the light distribution. Thus, Dr. Sellgren plans to not only derive the total mass distribution from stellar kinematics, but also to examine the effect of apparent changes in the stellar population in the central parsec on the mass to light ratio. Her study of stellar kinematics will include an improved measure of the velocity dispersion of many individual bright cool stars in the Galactic Center; a careful theoretical analysis of previously observed stellar kinematics; and a comparison of the kinematics of Galactic Center stars and stars in the galactic bulge. To understand stellar populations in the central parsec of the Galaxy, Dr. Sellgren will observe the spatial variation of the strength of the 2.3 micron absorption feature of carbon monoxide in cool stars; search for Brackett gamma absorption from hot stars, and if detected, use it for stellar kinematics; and search for water vapor and neutral sodium absorption from cool dwarf stars.

塞尔格伦博士将研究恒星运动学和恒星 我们银河系中心几秒差距的人口。 她的主要 目的是确定是否存在大质量黑洞。 其 质量将取决于总质量 分布和恒星质量分布推断从 光分布 因此，Sellgren博士计划不仅要获得 恒星运动学的总质量分布， 研究恒星数量明显变化的影响 在中央秒差距的质量与光的比例上。 她的研究 恒星运动学将包括改进的速度测量 银河系中许多单独的亮冷恒星的分散 中心;对先前观察到的 恒星运动学;和银河系运动学的比较 中心恒星和银河系凸起的恒星。 了解 银河系中央秒差距内的恒星数量。 Sellgren将观察到的强度的空间变化， 2.3冷星中一氧化碳的微米吸收特征; 寻找热恒星的Brackett伽马吸收，如果 探测到，用它来研究恒星运动学;并寻找水蒸气 和中性钠的吸收。