A CCD Survey of the Brighter Stars in Globular Clusters

观测恒星演化领域的主要内容是研究星团的Hertzsprung-Russell图(恒星表面温度与光度的关系)的形式。使用一种新的广视场电荷耦合装置(电荷耦合装置)相机，在两年的时间里，主要和合作调查员将获得50个球状星团中较亮恒星的准确颜色和亮度，并将它们放置在统一的尺度上。这些结果将被用来推导恒星的星团年龄和结构特性，当它们从“主序”演化出来，变成红巨星，并最终成为“水平分支恒星”。

The staple of the field of observational stellar evolution is the study of the form of the Hertzsprung-Russell Diagram (stellar surface temperature vs. luminosity) of star clusters. Using a new wide-field CCD (Charge Coupled Device) camera and over a two year period, the the Principal and Co-Investigators will obtain accurate colors and brightnesses of the brighter stars in 50 globular clusters and place them on a uniform scale. These results will be used to derive the cluster ages and structural properties of the stars as they evolve off the "main sequence", become red giants, and ultimately "horizontal branch stars."