%0 Journal Article %T Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm
Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm %A CUI Wen-Yuan %A CUI Dong-Nuan %A DU Yun-Shuang %A ZHANG Bo %A
崔文元 %A 崔冬暖 %A 杜云霜 %A 张波 %J 中国物理快报 %D 2007 %I %X 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-commonenvelope 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. %K 97 %K 10 %K Cv %K 26 %K 45 %K +h %K 97 %K 10 %K Tk
中子 %K 捕获 %K 金属性 %K 参数模型 %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=03664AC44D4808189CF1CE946E299A4B&yid=A732AF04DDA03BB3&vid=B91E8C6D6FE990DB&iid=94C357A881DFC066&sid=656BC79BFC7F0F4B&eid=76DAC16A9BFED90B&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=0