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.

在这项合作奖励中，PIS将使用开普勒和Corot Asteroseic Data以及超过10,000多个红色巨型分支（RGB）恒星的高分辨率光谱确定出色的年龄在20％以内。 研究人员计划利用这样一个事实，即如果可以测量RGB恒星的质量和组成，那么由于主序列之后的进化迅速，可以准确确定恒星的年龄。 Asterosology数据提供了有关RGB脉动振幅的信息，这些信息与光谱和光度法的金属性信息结合在一起，以得出恒星？年龄。 需要改进的恒星年龄来限制恒星形成和银河进化的模型。该提案已经说出了更广泛的影响，因为它将有助于培训研究生，一些本科生。 此外，这项工作将与恒星建模以及银河建模有关，研究人员将生产具有年龄，恒星参数和化学丰度的红色巨人的目录。