Metallicity Gradients in the Milky Way Disk

银河系盘中的金属丰度梯度

• 批准号: 0907873
• 负责人: Katia Cunha
• 金额: $ 43.12万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0907873&HistoricalAwards=false
• 关键词: Metallicity; Gradients; Milky; Way; Disk

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). The objective of this project is to address and improve the poor constraints on gradients in chemical abundances across the galactic disk by carrying out a consistent, state-of-the-art analysis of a statistically-robust sample of several hundred OB stars. The work will use high-resolution spectra of about 700 OB stars that have been collected over the last few years. The stellar sample spans a range in galactocentric distance from ~5 to 20 kpc, with an emphasis on measuring gradients in the outer disk, which provide the strongest constraints on chemical evolution models and the best opportunity to chart the evolution of the galaxy. The Broader Impacts of this program include mentoring of undergraduate students in the Research Experiences for Undergraduates program at the National Optical Astronomy Observatory.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。该项目的目的是通过对几百个OB恒星的统计学固定样本进行一致的最新分析来解决和改善银河磁盘化学丰度梯度的不良约束。这项工作将使用过去几年收集的大约700颗OB恒星的高分辨率光谱。恒星样品跨越半乳酸距离的范围从〜5到20 kpc，重点是测量外磁盘中的梯度，这为化学演化模型提供了最强的约束，并且是图表银河系演变的最佳机会。该计划的更广泛影响包括在国家光学天文台的本科生研究经验中指导本科生。