Collaborative Research: Ages for Red Giants, New Insights into the Star Formation History of the Milky Way

合作研究：红巨星的年龄，对银河系恒星形成历史的新见解

• 批准号: 1211673
• 负责人: Jennifer Johnson
• 金额: $ 26.31万
• 依托单位: Ohio State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1211673&HistoricalAwards=false
• 关键词: Collaborative; Research; Ages; Red; Giants

In this collaborative award, the PIs will determine stellar ages to within 20% using Kepler and CoRoT asteroseismic data, and high-resolution spectra of more than 10,000 red giant branch (RGB) stars. The investigators plan to capitalize on the fact that if the mass and composition of an RGB star can be measured, then the age of the star can be determined accurately because of the swiftness of evolution after the main sequence. Asteroseismological data provides information on RGB pulsation amplitudes, which are combined with metallicity information from spectroscopy and photometry in order to derive the stars? ages. The improved stellar ages are needed to constrain models of star formation and galactic evolution. The proposal has stated broader impacts in that it will help train a graduate student, some undergraduate students. Also, the work will be relevant to stellar modeling as well as well as Galactic modeling, and the investigators will produce a catalog of red giants with ages, stellar parameters and chemical abundances.

在这个合作奖项中，PI将使用开普勒和CoRoT的星震数据以及超过10，000颗红巨星分支（RGB）恒星的高分辨率光谱来确定恒星年龄，误差在20%以内。 研究人员计划利用这样一个事实，即如果RGB星星的质量和成分可以测量，那么星星的年龄就可以准确确定，因为主序星之后的演化是不稳定的。 星震学数据提供了RGB脉动幅度的信息，这些信息与光谱学和光度学的金属丰度信息相结合，以得出恒星的位置。年龄 需要改进的恒星年龄来约束星星形成和星系演化的模型。该提案具有更广泛的影响，因为它将有助于培养一名研究生，一些本科生。 此外，这项工作将与恒星建模以及银河系建模有关，研究人员将制作一个红巨星的目录，包括年龄，恒星参数和化学丰度。