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The Stellar Abundances for Galactic Archeology (SAGA) Database - Compilation of the Characteristics of Known Extremely Metal-Poor Stars
Takuma Suda, Yutaka Katsuta, Shimako Yamada +6
We describe the construction of a database of extremely metal-poor (EMP) stars in the Galactic halo whose elemental abundances have been determined. Our database contains detailed…
Highly He-Rich Matter Dredged Up by Extra Mixing through Stellar Encounters in Globular Clusters
Takuma Suda, Takuji Tsujimoto, Toshikazu Shigeyama +1
The unveiled main-sequence splitting in omega Centauri as well as NGC 2808 suggests that matter highly-enriched in He (in terms of its mass fraction Y~0.4) was produced and made th…
Surface pollution of main-sequence stars through encounters with AGB ejecta in omega Centauri
Takuji Tsujimoto, Toshikazu Shigeyama, Takuma Suda
The origin of a double main-sequence (MS) in omega Centauri is explored. We have shown from theoretical calculations on the stellar evolution that the colors of MS stars are shifte…
The Origin of Carbon-Enhancement and Initial Mass Function of Extremely Metal-Poor Stars in the Galactic Halo
Yutaka Komiya, Takuma Suda, Hiroki Minaguchi +3
It is known that the carbon-enhanced, extremely metal-poor (CEMP) stars constitute a substantial proportion in the extremely metal-poor (EMP) stars of the Galactic Halo, by far lar…
Various Modes of Helium Mixing in Globular Cluster Giants and Their Possible Effects on the Horizontal Branch Morphology
Takuma Suda, Masayuki Y. Fujimoto
It has been known for a long time that some red giants in globular clusters exhibit large star-to-star variations in the abundances of light elements that are not exhibited by fiel…
The origin of HE0107-5240 and the production of O and Na in extremely metal-poor stars
Takuma Suda, Masayuki Aikawa, Takanori Nishimura +2
We elaborate the binary scenario for the origin of HE0107-5240, the most metal-poor star yet observed ([Fe/H] = -5.3), using current knowledge of the evolution of extremely metal-p…