Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm
نویسندگان
چکیده
منابع مشابه
Abundance Analysis of HE 2148–1247, A Star With Extremely Enhanced Neutron Capture Elements
Based on observations obtained at the W.M. Keck Observatory, which is operated jointly by the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. Palomar Observatory, Mail Stop 105-24, California Institute of Technology, Pasadena, Ca., 91125 Department of Astronomy and Space Physics, University of Uppsala, Box 524, SE-75120 Up...
متن کاملNeutron-capture elements in the s- and r-process-rich stars: Constraints on neutron-capture nucleosynthesis processes
The chemical abundances of the very metal-poor double-enhanced stars are excellent information for setting new constraints on models of neutron-capture processes at low metallicity. These stars are known as s+r stars, since they show enhancements of both s-process and r-process elements. The observed abundance ratios for the double-enhanced stars can be explained by those of stars that were pol...
متن کاملASTROPHYSICAL NEUTRON CAPTURE RATES IN s– AND r–PROCESS NUCLEOSYNTHESIS
Astrophysical neutron capture rates of light and heavy nuclei have been measured and calculated. For the measurements the activation technique was applied at the 3.75 MV Karlsruhe Van de Graaff accelerator, and at the Geel electron linear accelerator (GELINA) the time–of–flight (TOF) method was used. The calculations were performed using direct and compound nuclear capture models.
متن کاملThe Chemical Composition of HE 1305+0132: A Carbon-Enhanced Metal-Poor Star with Enhanced Fluorine
The abundances of Fe, C, N, and Ba have been derived for the Carbon-Enhanced Metal-Poor star HE 1305+0132. The C and N abundances are typical of CEMP stars. The Ba abundance, derived for the first time for HE 1305+0132, is found to be enhanced relative to Fe, placing this star in the CEMP-s group. Combined with a previously derived highly enhanced abundance of F, the chemical composition of HE ...
متن کاملThe Hamburg/ESO R-process Enhanced Star survey (HERES) I. Project description, and discovery of two stars with strong enhancements of neutron-capture elements
We report on a dedicated effort to identify and study metal-poor stars strongly enhanced in r-process elements ([r/Fe] > 1 dex; hereafter r-II stars), the Hamburg/ESO R-process Enhanced Star survey (HERES). Moderate-resolution (∼2 Å) follow-up spectroscopy has been obtained for metal-poor giant candidates selected from the Hamburg/ESO objective-prism survey (HES) as well as the HK survey to ide...
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ژورنال
عنوان ژورنال: Chinese Physics Letters
سال: 2007
ISSN: 0256-307X,1741-3540
DOI: 10.1088/0256-307x/24/5/081