Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006asthe..99..358h&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 99, No. 7, p. 358 - 364 (2006)
Astronomy and Astrophysics
Astronomy
Metal-Poor Stars, Element Abundances, Cosmochronology
Scientific paper
The abundance analyses of metal-poor stars by high dispersion spectroscopy shed light on the origin of elements. However, the details of the r-process which produces the half of elements heavier than iron are still unknown. We observed very metal-poor stars to investigate the r-process nucleosynthesis with Subaru/HDS. We found that the abundance pattern of stable elements heavier than Ba (atomic number 56) in observed stars are similar to that of the solar system r-process component. This means that the abundance pattern produced by r-process is unique (the universality of the r-process). However, our observation shows more than one process contributes to the neutron-capture elements lighter than Ba even in metal-poor stars. We also found a dispersion of the abundance ratio of the radio-active element thorium and the stable element europium. This results give a big impact on the cosmo-chronometry using radio active elements.
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