Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..haw.ta004a&link_type=abstract
American Physical Society, First Joint Meeting of the Nuclear Physicists of the American and Japanese Physical Societies October
Physics
Scientific paper
8.2m Subaru telescope is multi-purpose telescope which has seven instruments ranging from optical to mid-infrared wavelength. Among them, HDS (High Dispersion Spectrograph) is designed as an echelle spectrograph to take high resolution spectra (R=100,000). We started a project to decipher the evolution history of nuclides synthesis in the universe with use of HDS. For this purpose, we collect the proper sample of spectra for stars, interstellar medium through distant stars, and also intergalactic medium through QSOs. Based on these data, we pay an attention in particular to the evolution history of light elements, s- and r- process elements. In this conference, firstly we would like to show the preliminary result for r-process elements. In general, [Fe/H] , that is, metallicity is considered as a good indicator of cosmic chronicle. In comparison with 4m class telescopes, 8m class telescopes has a capability to see fainter stars, that is, lower [Fe/H] stars called as metal poor stars. So we may extend the stellar samples further to metal poor stars ([Fe/H]<-2.5) with HDS. With our higher quality data, the large scatter of the r- process elements among stars in the range of [Fe/H]< -2.5 is confirmed as real. We will discuss its meaning in relation with the evolution of our Galaxy. Secondly, we introduce the study of distribution of Li isotope ratio over the galactic distance. Since this ratio is not affected by absorption onto dust grains, we can estimate the spallation production of 6Li over galactic distance. We may also get some hints on the chemical evolution of our Galaxy. At the same time, we conducted the detection of 6Li in stellar spectra, but has no positive detection at the moment. If the additional new results are coming out, we will present these in the conference.
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