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HE1327-2326, an unevolved star with [Fe/H]<-5.0. I. A Comprehensive Abundance Analysis
W. Aoki, A. Frebel, N. Christlieb +17
We present the elemental abundances of HE1327-2326, the most iron-deficient star known, determined from a comprehensive analysis of spectra obtained with the Subaru Telescope High…
Observational Constraints on Accelerating Brane Cosmology with Exchange between the Bulk and Brane
K. Umezu, K. Ichiki, T. Kajino +3
We explore observational constraints on a cosmological brane-world scenario in which the bulk is not empty. Rather, exchange of mass-energy between the bulk and the bane is allowed…
Constraining the Spectrum of Supernova Neutrinos from Neutrino-Process-Induced Light-Element Synthesis
Takashi Yoshida, Toshitaka Kajino, Dieter H. Hartmann
We constrain energy spectra of supernova neutrinos through the avoidance of an overproduction of the 11B abundance during Galactic chemical evolution. In supernova nucleosynthesis…
Nucleosynthetic signatures of the first stars
Anna Frebel, Wako Aoki, Norbert Christlieb +16
The chemically most primitive stars provide constraints on the nature of the first stellar objects that formed in the Universe; elements other than hydrogen, helium and traces of l…
New s-process path and its implication to 187Re-187Os nucleo-cosmochronometer
T. Hayakawa, T. Shizuma, T. Kajino +4
We study a new s-process path through an isomer of Re to improve a Re-Os nucleo-cosmochronometer. The nucleus Re is produced by this new path of $^{…
Spectroscopic Studies of Very Metal-Poor Stars with the Subaru High Dispersion Spectrograph. III. Light Neutron-Capture Elements
Wako Aoki, Satoshi Honda, Timothy C. Beers +7
Elemental abundance measurements have been obtained for a sample of 18 very metal-poor stars using spectra obtained with the Subaru Telescope High Dispersion Spectrograph. Seventee…