A Study of Elemental Abundance Pattern of the r-II Star HD 222925  

作　　者：Fang Wen Wan-Qiang Han Wen-Yuan Cui Hong-Jie Li Bo Zhang 

机构地区：[1]College of Physics,Hebei Normal University,Shijiazhuang 050024,China [2]Department of Physics,Shijiazhuang University,Shijiazhuang 050035,China [3]School of Sciences,Hebei University of Science and Technology,Shijiazhuang 050018,China

出　　处：《Research in Astronomy and Astrophysics》2023年第12期118-127,共10页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)under grants 12173013,11773009;the National Key Basic R&D Program of China via 2019YFA0405500;W.Y.C.is supported by the“333 talents project”of Hebei Province under the number A202010001;supported by the Natural Science Foundation of Hebei Province under grant A2021205006;by the project of the Hebei provincial department of science and technology under grant number 226Z7604G;by Scientific Research Project of Hebei Province(ZC2022090);Shijiazhuang University Doctoral Scientific Research Fund Project(21BS014)。

摘　　要：HD 222925 is a rare r-process enhanced star in the Milky Way because of its metal abundance([Fe/H]=-1.46±0.10)and Eu abundance([Eu/Fe]=1.32±0.08).Based on the very complete set of elemental abundances of HD 222925,we use the abundance decomposition method to fit the observed abundances of 58elements in the sample star,which is also the largest number of elemental abundances fitted at the same time for a fixed star.We analyze the astrophysical origins of elements in HD 222925 by its abundance ratios and component ratios.It is found that the light elements and the iron group elements in HD 222925 mainly originate from the primary process of the TypeⅡsupernovae(SNeⅡ)with the progenitor mass M>10 M_(⊙)and have no contribution from SNe Ia and the first generation of very massive stars.The contribution of the weak r-process to Ga,Ge,and As is superior to that of the other processes,and its contribution decreases linearly with increasing atomic number.The main r-process that is likely derived from a neutron star merger plays a key role in the formation of neutroncapture elements(Z≥38)in HD 222925.

关 键 词：STARS chemically peculiar-stars individual(HD 222925)-nuclear reactions-nucleosynthesis-abundances-stars ABUNDANCES 

分 类 号：P148[天文地球—天体物理]