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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…
Searching for a Companion Star of Tycho's Type Ia Supernova with Optical Spectroscopic Observations
Yutaka Ihara, Jin Ozaki, Mamoru Doi +4
We report our first results of photometric and spectroscopic observations for Tycho's supernova remnant (SNR Tycho) to search for the companion star of a type Ia supernova (SN Ia).…
Self-similar solutions for the emergence of energy varying shock waves from plane-parallel atmospheres
Akihiro Suzuki, Toshikazu Shigeyama
We present a self-similar solution to describe the propagation of a shock wave whose energy is deposited or lost at the front. Both of the propagation of the shock wave in a medium…
Relativistic Flows After Shock Emergence
Reina Kikuchi, Toshikazu Shigeyama
We investigate relativistic flows after a shock wave generated in a star arrives at the surface. First, the sphericity effect is involved through a successive approximation procedu…
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…