Abundances of Metal-Poor Stars and Slow Neutron-Capture Progress

ZHANG Miao-Jing; ZHANG Bo; LIU Ji-Hong; LI Guang-Lie

Chinese Physics C> 2003, Vol. 27> Issue(4) : 304-308

Abundances of Metal-Poor Stars and Slow Neutron-Capture Progress

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China2 Department of Physics and Eletronic Science, Guangxi Normal University, Guilin 541004, China3 Department of Physics, Hebei Normal University, Shijiazhuang 050016, China4 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China

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Abstract：
We apply the parametric model to fit the surface abundances of three lead rich stars (HD187861, HD196944 and HD224959) without adopting any specific stellar model. It shows that the calculated result can fit the observed data well whether the reaction branchings are taken into account or not. Besides, by the comparison of the model parameters of the three lead rich stars with those of two very metal poor stars (LP625 44 and LP706 7), we find out that the average neutron exposure of the former is larger than that of the latter, but the dredge up extent is smaller. We come to the conclusion that the parametric model is significant of constraints on the stellar model, though it is very simple.

References

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. Burbidge E M ,Berbidge G R ,Fowler W A et al.Rev.Mod.Phys.,1957,29:547—6502. LI GuangLie,LI Long.Nuclear Physics Review,1999,16:201—206(in Chinese)(厉光烈,李龙.原子核物理评论,1999,16:201—206)3. ZHANG MiaoJing,ZHANG Bo,LI GuangLie.Nuclear Physics Review,2002,19:321—328(in Chinese)(张妙静,张波,厉光烈.原子核物理评论,2002,19:321—328)4. Gallino R ,Arlandini C ,Busso M et al.Ap.J.,1998,497:388—4035. Van Eck S ,Goriely S ,Jorissen A et al.Nature,2001,412:793—7956. Aoki W ,Ryan S G ,Norris J E et al.Ap.J .,2001,561:346—3637. Howard W M ,Mathews G J, Takahashi K et al. Ap.J.,1986,309:633—6528. Arlandini C , K ppeler F ,Wisshak K et al. Ap.J .,1999,525:886—9009. BAO Z Y ,Beer H ,K ppeler F et al.Atomic Data and Nuclear Data Tables,2000,76:70—154

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ZHANG Miao-Jing, ZHANG Bo, LIU Ji-Hong and LI Guang-Lie. Abundances of Metal-Poor Stars and Slow Neutron-Capture Progress[J]. Chinese Physics C, 2003, 27(4): 304-308.

ZHANG Miao-Jing, ZHANG Bo, LIU Ji-Hong and LI Guang-Lie. Abundances of Metal-Poor Stars and Slow Neutron-Capture Progress[J]. Chinese Physics C, 2003, 27(4): 304-308. shu

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Received: 2002-07-15
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Abundances of Metal-Poor Stars and Slow Neutron-Capture Progress

Corresponding author: ZHANG Miao-Jing,

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China2 Department of Physics and Eletronic Science, Guangxi Normal University, Guilin 541004, China3 Department of Physics, Hebei Normal University, Shijiazhuang 050016, China4 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China

Received Date: 2002-07-15
Accepted Date: 1900-01-01
Available Online: 2003-04-05

Abstract: We apply the parametric model to fit the surface abundances of three lead rich stars (HD187861, HD196944 and HD224959) without adopting any specific stellar model. It shows that the calculated result can fit the observed data well whether the reaction branchings are taken into account or not. Besides, by the comparison of the model parameters of the three lead rich stars with those of two very metal poor stars (LP625 44 and LP706 7), we find out that the average neutron exposure of the former is larger than that of the latter, but the dredge up extent is smaller. We come to the conclusion that the parametric model is significant of constraints on the stellar model, though it is very simple.