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

在这项合作奖中，PI将使用开普勒和CoRoT的恒星地震数据以及超过10,000颗红巨星分支(RGB)的高分辨率光谱来确定恒星年龄，精度在20%以内。研究人员计划利用这样一个事实，即如果可以测量到RGB恒星的质量和组成，那么就可以准确地确定恒星的年龄，因为主序之后的演化速度很快。星震学数据提供了关于RGB脉动幅度的信息，这些信息与来自光谱和光度学的金属丰度信息相结合，以得出恒星？年龄。需要改进的恒星年龄来约束恒星形成和星系演化的模型。该提案说明了更广泛的影响，因为它将有助于培养研究生，一些本科生。此外，这项工作将与恒星建模和银河系建模有关，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.