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Nucleosynthesis in Electron Capture Supernovae of AGB Stars
S. Wanajo, K. Nomoto, H. -Th. Janka +2
We examine nucleosynthesis in the electron capture supernovae of progenitor AGB stars with an O-Ne-Mg core (with the initial stellar mass of 8.8 M_\odot). Thermodynamic trajectorie…
Cold r-Process in Neutrino-Driven Winds
Shinya Wanajo
The r-process in a low temperature environment is explored, in which the neutron emission by photodisintegration does not play a role (cold r-process). A semi-analytic neutrino-dri…
The r-Process in Supersonic Neutrino-Driven Winds: The Roll of Wind Termination Shock
Takami Kuroda, Shinya Wanajo, Ken'ichi Nomoto
Recent hydrodynamic studies of core-collapse supernovae imply that the neutrino-heated ejecta from a nascent neutron star develops to supersonic outflows. These supersonic winds ar…
Neutron-capture elements in the very metal-poor star HD88609: another st ar with excesses of light neutron-capture elements
Satoshi Honda, Wako Aoki, Yuhri Ishimaru +1
We obtained a high resolution, high signal-to-noise UV-blue spectrum of the extremely metal-poor red giant HD88609 to determine the abundances of heavy elements. Nineteen neutron-c…
The r-Process in the Proto-Neutron-Star Winds with Anisotropic Neutrino Emission
Shinya Wanajo
The astrophysical origin of the r-process nuclei is still unknown. Even the most promising scenario, the neutrino-driven winds from a nascent neutron star, encounters severe diffic…
Neutron-capture elements in the very metal-poor star HD122563
S. Honda, W. Aoki, Y. Ishimaru +2
We obtained high resolution, high S/N spectroscopy for the very metal-poor star HD122563 with the Subaru Telescope High Dispersion Spectrograph. Previous studies have shown that th…