CCD Photometry of RR Lyrae Stars

史密斯95-28080史密斯博士将完成近40年前由巴德和斯沃普发起的对德拉科矮星球状星系中变星的调查。新的CCD观测将提供准确的多色光曲线，将变量放置在HR图中，并与后续的光谱观测一起测试该系统中是否存在金属丰度-光度关系。对多周期天琴座RR恒星的密集系列光度观测将提供检验这一鲜为人知的现象的理论所需的观测基础。M14、M15和M53中的RR天琴座变量也将被研究。***

Smith 95-28080 Dr. Smith will complete the survey of variable stars in the Draco dwarf spheroidal galaxy which was initiated by Baade and Swope almost 40 years ago. New CCD observations will provide accurate multicolor lightcurves which will place the variables in the HR diagram and, together with follow-up spectroscopic observations, test the existence of a metallicity-luminosity relation in that system. Intensive series of photometric observations of multiperiodic RR Lyrae stars will provide the observational base needed to test theories of that poorly understood phenomenon. RR Lyrae variables in M14, M15 and M53 also will be studied. ***