A study of the origin of heavy element and chemical evolution of the Galaxy

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The purpose of this study is to clarify the origin of the r-process elements which makes heavy elements like gold and uranium. In order to investigation of the r-process abundances, we observe very metal-poor stars in galactic halo and dwarf galaxy using the high dispersion spectrograph (HDS). The dwarf galaxies are believed to play roles in understanding the formation processes of the Galaxy. No r-process enhanced metal-poor star is found in dwarf galaxies. This result indicates that dwarf galaxies may have history of the chemical evolution different from the Galaxy.