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Browsing by Author "Kajino, T."
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Abundances and Evolution of Lithium in the Galactic Halo and Disk
Ryan, Sean G.; Kajino, T.; Beers, T.C.; Suzuki, T.K.; Romano, D.; Matteucci, F.; Rosolankova, K. (2001-03)We have measured the Li abundance of 18 stars with [2[[Fe/H][[1 and 6000[Teff[6400 K, a parameter range that was poorly represented in previous studies. We examine the Galactic chemical evolution (GCE) of this element, ... -
Astrophysical Reaction Rates as a Challenge for Nuclear Reaction Theory
Rauscher, T. (American Institute of Physics (AIP), 2010)The relevant energy ranges for stellar nuclear reactions are introduced. Low-energy compound and direct reactions are discussed. Stellar modifications of the cross sections are presented. Implications for experiments are outlined. -
Europium Isotope Ratios in s-Process Element-enhanced Metal-poor Stars : A New probe of the 151Sm Branching
Aoki, W.; Ryan, Sean G.; Iwamoto, N.; Beers, T.C.; Norris, J.E.; Ando, H.; Kajino, T.; Mathews, G.J.; Fujimoto, M.Y. (2003-08) -
Neutron Capture Elements in s-Process-Rich, Very Metal-Poor Stars
Aoki, W.; Ryan, Sean G.; Norris, J.E.; Beers, T.C.; Ando, H.; Iwamoto, N.; Kajino, T.; Mathews, G.J.; Fujimoto, M.Y. (2001-11) -
The new record holder for the most iron-poor star: HE 1327−2326, a dwarf or subgiant with [Fe/H] = −5.4
Frebel, A.; Aoki, W.; Christlieb, N.; Ando, H.; Asplund, M.; Barklem, P.S.; Beers, T.C.; Eriksson, K.; Fechner, C.; Fujimoto, M.Y.; Honda, S.; Kajino, T.; Minezaki, T.; Nomoto, K.; Norris, J.E.; Ryan, Sean G.; Takada-Hidai, M.; Tsangarides, S.; Yoshii, Y. (2005)We describe the discovery of HE 1327−2326, a dwarf or subgiant with [Fe/H] = −5.4. The star was found in a sample of bright metal-poor stars selected from the Hamburg/ESO survey. Its abundance pattern is characterized by ... -
Nucleosynthetic signatures of the first stars
Frebel, A.; Aoki, W.; Christlieb, N.; Ando, H.; Asplund, M.; Barklem, P.S.; Beers, T.C.; Eriksson, K.; Fechner, C.; Fujimoto, M.Y.; Honda, S.; Kajino, T.; Minezaki, T.; Nomoto, K.; Norris, J.E.; Ryan, Sean G.; Takada-Hidai, M.; Tsangarides, S.; Yoshii, Y. (2005-04) -
Proton-rich nucleosynthesis and nuclear physics
Rauscher, T.; Froehlich, C. (American Institute of Physics (AIP), 2012)Although the detailed conditions for explosive nucleosynthesis are derived from astrophysical modeling, nuclear physics determines fundamental patterns in abundance yields, not only for equilibrium processes. Focussing on ... -
Rapid Rotation of Ultra-Li-depleted Halo Stars and Their Association with Blue Stragglers
Ryan, Sean G.; Gregory, S.; Kolb, U.; Beers, T.C.; Kajino, T. (2002-05) -
Spectroscopic Studies of Extremely Metal-Poor Stars with the Subaru High Dispersion Spectrograph. I. Observational Data
Honda, S.; Aoki, W.; Ando, H.; Izumiura, H.; Kajino, T.; Kambe, E.; Kawanomoto, S.; Noguchi, K.; Okita, K.; Sadakane, K.; Sato, B.; Takada-Hidai, M.; Takeda, Y.; Watanabe, E.; Beers, T.C.; Norris, J.E.; Ryan, Sean G. (2004-05) -
Ultra-Lithium-deficient Halo Stars and Blue Stragglers : A Common Origin?
Ryan, Sean G.; Beers, T.C.; Kajino, T.; Rosolankova, K. (2001-01)