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A low upper-limit on the lithium isotope ratio in HD140283
Wako Aoki, Susumu Inoue, Satoshi Kawanomoto +4
We have obtained a high-S/N (900-1100), high-resolving-power (R=95000) spectrum of the metal-poor subgiant HD 140283 in an effort to measure its 6Li/7Li isotope ratio. From a 1-D a…
Oxygen Overabundance in the Extremely Iron-Poor Star CS29498-043
Wako Aoki, John E. Norris, Sean G. Ryan +4
An abundance analysis for the carbon-enhanced, extremely iron-poor ([Fe/H] -3.5) star CS29498-043 has been obtained using new high-resolution, high signal-to-noise spectra from the…
Chemical composition of UV-bright star ZNG 4 in the globular cluster M13
S. Ambika, M. Parthasarathy, W. Aoki +4
We present a detailed model-atmosphere analysis of ZNG 4, a UV-bright star in the globular cluster M13. From the analysis of a high resolution () spectrum of th…
Spectroscopic Studies of Extremly Metal-Poor Stars with Subaru/HDS:II.The r-process Elements, Including Thorium
S. Honda, W. Aoki, T. Kajino +5
We present the abundance analyses for the neutron-capture elements, and discuss the observed abundance distributions in very metal-poor stars with excesses of r-process elements. A…
Spectroscopic Studies of Extremely Metal-Poor Stars with Subaru/HDS:I. Observational Data
S. Honda, W. Aoki, H. Ando +14
We have obtained high-resolution (R 50,000 or 90,000), high-quality (S/N $\ga$ 100) spectra of 22 very metal-poor stars ([Fe/H] $\la$ -2.5) with the High Dispersion Spectr…