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

在这个合作项目中，pi将利用开普勒和CoRoT的星震数据，以及1万多颗红巨星分支（RGB）的高分辨率光谱，确定恒星年龄在20%以内。研究人员计划利用这样一个事实：如果可以测量RGB恒星的质量和组成，那么由于主序星之后的演化速度之快，就可以准确地确定恒星的年龄。星震数据提供了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，从而推导出恒星？年龄。改进的恒星年龄是约束恒星形成和星系演化模型所必需的。该提案提出了更广泛的影响，因为它将有助于培养研究生，一些本科生。此外，这项工作将与恒星模型和银河系模型相关，研究人员将制作一份红巨星的目录，其中包括年龄、恒星参数和化学丰度。

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.