标题： 疏散星团 NGC 6791 中恒星的 CN 和 CH 分子带强度分析 显示英文标题

标题： Analysis of the CN and CH molecular band strengths in stars of the open cluster NGC 6791

摘要： 使用低分辨率的SDSS/SEGUE光谱研究了疏散星团NGC 6791中不同演化阶段恒星的CN和CH分子带强度的变化。 我们发现CN带强度存在显著变化，比预期的不确定性大两倍以上，尽管在球状星团中观察到的双峰结构在这里并不明显。 这种行为不仅出现在红团簇天体中，还出现在尚未演化的恒星中，如主序星和较低的红巨星分支。 相比之下，并非所有研究的恒星在其CH带强度上都显示出显著的变化。 显示英文摘要

摘要： Low resolution SDSS/SEGUE spectra have been used to study the behavior of the strengths of the CN and CH molecular bands in stars at different evolutionary stages of the open cluster NGC 6791. We find a significant spread in the strengths of the CN bands, more than twice that expected from the uncertainties, although the bimodalities observed in globular clusters are not clearly observed here. This behavior, is observed not only among red clump objects but also in unevolved stars such as those in the main sequence and lower red giant branch. In contrast, not all the stars studied show significant scatter in their CH strengths.