The Analysis of Cool Stars Using Synthetic Spectroscopy and Photometry

首席研究员建议推导出冷恒星大气中碳(C)、氮(N)和氧(O)的丰度，以及球状星团Hertzsprung-Russel图中关闭区域的恒星的碳(C)、氮(N)和氧(O)。(球状星团是由大约10万到100万颗恒星组成的聚集体，是我们的星系和其他星系中最古老的天体之一。)这项研究的工具是恒星大气的计算机代码和原子和分子光谱线的大型文件。该模型为通量常数，并考虑了对流和线吸收的影响。理论结果将与观测结果进行比较，目的是确定球状星团的年龄、红巨星中混合的机制、原始CNO丰度及其产生方式，以及我们银河系和仙女座星系中球状星团之间的差异。

The Principal Investigator proposes to derive the abundances of carbon (C), nitrogen (N), and oxygen (O) in the atmospheres of cool stars and stars at the turn-off region in the Hertzsprung-Russel diagram of globular clusters. (Globular star clusters are aggregates of about 100,000 to 1,000,000 stars and among the oldest objects in our and other galaxies.) The tools for this research are computer codes for stellar atmospheres and a large file of data of atomic and molecular spectral lines. The models are flux constant and include the effects of convection and line absorption. The theoretical results will be compared with observations with the aim of determining the ages of globular clusters, the mechanisms of mixing in red giant stars, the primordial CNO abundances and how they were produced, and the difference between globular clusters in our Galaxy and the Andromeda galaxy.