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Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm |
| CUI Wen-Yuan 1,2,3;CUI Dong-Nuan1;DU Yun-Shuang1;ZHANG Bo 1,2 |
| 1Department of Physics, Hebei Normal University, Shijiazhuang 0500162National Astronomical Observatories, Chinese Academy of Sciences, Beijing 1000123Graduate School of the Chinese Academy of Sciences, Beijing 100049 |
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| Cite this article: |
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CUI Wen-Yuan, CUI Dong-Nuan, DU Yun-Shuang et al 2007 Chin. Phys. Lett. 24 1417-1420 |
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Abstract The star HE 1305-0007 is a metal-poor double-enhanced star with metallicity [Fe/H] =-2.0, which is just at the upper limit of the metallicity for the observed double-enhanced stars. Using a parametric model, we find that almost all s-elements were made in a single neutron exposure. This star should be a member of a post-common-envelope binary. After the s-process material has
experienced only one neutron exposure in the nucleosynthesis region and is dredged-up to its envelope, the AGB evolution is terminated by the onset of common-envelope evolution. Based on the high radial-velocity of HE 1305-0007, we speculate that the star could be a runaway star from a binary system, in which the AIC event has occurred and produced the r-process elements.
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| Keywords:
97.10.Cv
26.45.+h
97.10.Tk
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Received: 12 January 2007
Published: 23 April 2007
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| PACS: |
97.10.Cv
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(Stellar structure, interiors, evolution, nucleosynthesis, ages)
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26.45.+h
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97.10.Tk
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(Abundances, chemical composition)
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