| Distributions of Neutron Exposures in AGB Stars and the Galaxy |
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| 作者姓名： | Wen-Yuan Cui Feng-Hua Zhang Wei-Juan Zhang Lu Zhang and Bo Zhang National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Wen-Yuan Cui1，2，4，Feng-Hua Zhang2，Wei-Juan Zhang2，Lu Zhang3 and Bo Zhang1，2 1 National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 2 Department of Physics，Hebei Normal University，Shijiazhuang 050016;3 Department of Modern Physics，University of Science and Technology of China，Hefei 230026 4 Graduate School of Chinese Academy of Sciences，Bejing 100049 |
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| 摘 要： | Based on the s-process nucleosynthesis model with the 13C(α,n)16O reaction oc- curring under radiative conditions in the interpulse phases, we investigate the characteristics of the distribution of neutron exposure in low-mass Asymptotic Giant Branch (AGB) stars. We introduce a new concept, the distribution of neutron exposures of the Galaxy (NEG), to study the chemical evolution characteristics of the Galaxy for s-process elements. Using a chemical evolution model of the Galaxy, we develop a model for the NEG and obtain the evolution results of the NEG in different epochs. The present results appear to reasonably re- produce the distribution of neutron exposures of the solar system (hereafter NES). The main component and the strong component in the NES are built up in different epochs. The strong component of the s-process is mainly synthesised in the low-mass and metal-poor AGB stars, and the main component is produced by the s-process in the low-mass AGB stars with higher metallicities.
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| 关 键 词： | Galaxy: evolution—stars: AGB and post-AGB—stars: abundances |
Distributions of Neutron Exposures in AGB Stars and the Galaxy |
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| Wen-Yuan Cui,,,Feng-Hua Zhang,Wei-Juan Zhang,Lu Zhang and Bo Zhang, National Astronomical Observatories,Chinese Academy of Sciences,Beijing .Distributions of Neutron Exposures in AGB Stars and the Galaxy[J].Chinese Journal of Astronomy and Astrophysics,2007,7(2):224-234. |
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| Authors: | Wen-Yuan Cui Feng-Hua Zhang Wei-Juan Zhang Lu Zhang Bo Zhang |
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| Institution: | [1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 [2]Department of Physics, Hebei Normal University, Shijiazhuang 050016 [3]Department of Modern Physics, University of Science and Technology of China, Hefei 230026 [4]Graduate School of Chinese Academy of Sciences, Bejing 100049 |
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| Abstract: | |
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| Keywords: | Galaxy: evolution - stars: AGB and post-AGB- stars: abundances |
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