A Study of the Stars and the Structure Formation History in the Early Universe

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Recent presence of stars with heavier elements other than hydrogen and helium less than a thousandth of the solar abundances is revealed thanks to large-scale surveys and high dispersion spectroscopy studies with large telescope of diameter 8m for the Galactic halo. These stars are the low-mass survivors of the stars formed in early Universe just after the Big Bang. In this study, we investigate the characteristics of these extremely metal-poor stars theoretically and observationally to explore what are the first stars born first and in early stage in our Universe. In addition, with these stars as probe, we study and derive a new picture on the early evolution of Universe and the formation process of our Milky Way galaxy.