Comparative Spectroscopic Study of Stars in Nearby Dwarf Galaxies and in the Halo of Our Galaxy

利用SUBARU望远镜的高色散摄谱仪（HDS）对属于几个邻近矮星系的红巨星进行了高分辨率光谱观测。以我们的加沙里星系中几颗研究得很好的贫金属晕星为参考，对这些红巨星进行了简要的分析。在属于乌玛矮星系的几颗红巨星中发现了一些有趣的丰度模式，这些模式与在银河系晕星中发现的模式不同。这些发现可用于模拟矮星系的演化历史。2007年1月完成了对六分仪矮星系中红巨星的观测。对这些恒星的分析将在几年内完成。

High resolution spectroscopic observations of red giant stars belonging to several nearby dwarf galaxies were carried out using the high dispersion spectrograph (HDS) of the SUBARU telescope. Abundance analyses of these red giants were performed using several well studied metal deficient halo stars in our Gaxaly as references. Several interesting abundance patterns, which are different from those found in Galactic halo stars, were discovered in a few red giant stars belonging to the UMa dwarf galaxy. These findings can be used in modeling the evolution history of dwarf galaxies. Observations of red giant stars in the Sextans dwarf galaxy have completed in January, 2007. Analyses of these stars will be completed within a few years.