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Current signatures and search for Pop. III stars in the Local Universe
Yutaka Komiya, Takuma Suda, Masayuki Fujimoto
Recent numerical studies argue that low-mass stars can be formed even at zero-metallicity environment. These low-mass Population III(Pop.~III) stars are thought to be still shining…
Carbon-enhanced Metal-poor Stars in SDSS/SEGUE. II. Comparison of CEMP Star Frequencies with Binary Population Synthesis Models
Young Sun Lee, Takuma Suda, Timothy C. Beers +1
We present a comparison of the frequencies of carbon-enhanced metal-poor (CEMP) giant and main-sequence turnoff stars, selected from the Sloan Digital Sky Survey and the Sloan Exte…
The Stellar Abundances for Galactic Archaeology (SAGA) Database III - Analysis of Enrichment Histories for Elements and Two Modes of Star Formation during the Early Evolution of Milky Way
Shimako Yamada, Takuma Suda, Yutaka Komiya +2
We study the enrichment histories for nine elements, C, four alpha-elements of Mg, Si, Ca, and Ti, Sc, and three iron-peak elements of Co, Ni, and Zn, by using a large number of st…
Evolution and CNO yields of Z=10^-5 stars and possible effects on CEMP production
P. Gil-Pons, C. L. Doherty, H. Lau +5
Our main goals are to get a deeper insight into the evolution and final fates of intermediate-mass, extremely metal-poor (EMP) stars. We also aim to investigate their C, N, and O y…
Transition of the Stellar Initial Mass Function Explored with Binary Population Synthesis
Takuma Suda, Yutaka Komiya, Shimako Yamada +7
The stellar initial mass function (IMF) plays a crucial role in determining the number of surviving stars in galaxies, the chemical composition of the interstellar medium, and the…
Explaining the Sr and Ba Scatter in Extremely Metal-Poor Stars
Wako Aoki, Takuma Suda, Richard Boyd +2
Compilations of abundances of Strontium and Barium in extremely metal-poor stars show that an apparent cutoff is observed for [Sr/Ba] at [Fe/H]-3.6 and large fluctuations for [F…