The odd-isotope fractions of barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001

	The odd-isotope fractions of barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001
	Meng, X. Y.1; Cui, W. Y.1,2; Shi, J. R.3 ; Jiang, X. H.1; Zhao, G.3 ; Zhang, B.1 ; Li, J.1
刊名	ASTRONOMY & ASTROPHYSICS
	2016-09-01
卷号	593
关键词	stars: abundances stars: chemically peculiar stars: Population II
英文摘要	We report the first measurement of the odd-isotope fractions for barium, f(odd,Ba) in two extremely metal-poor stars: a CEMP-r/s star HE0338-3945 ([Fe/H] = -2.42 +/- 0.11) and an r-II star CS 31082-001 ([Fe/H] = -2.90 +/- 0.13). The measured f(odd, Ba) values are 0.23 +/- 0.12 corresponding to 34.3 +/- 34.3% of the r-process contributions for HE 0338-3945 and 0.43 +/- 0.09 corresponding to 91.4 +/- 25.7% of the r-process contribution to Ba production for CS 31082-001. The high r-process signature of barium in CS 31082-001 (91.4 +/- 25.7%) suggests that the majority of the heavy elements in this star were synthesised via an r-process path, while the lower r-process value (34.3 +/- 34.3%) found in HE0338-3945 indicates that the heavy elements in this star formed through a mix of s-process and r-process synthesis. These conclusions are consistent with studies based on asymptotic giant branch star model calculations to fit their abundance distributions.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	METAL-POOR STARS ; GIANT BRANCH STARS ; HEAVY-ELEMENT ABUNDANCES ; CORE-COLLAPSE SUPERNOVAE ; NEUTRON-CAPTURE ELEMENTS ; COOL DWARF STARS ; S-PROCESS ; PROCESS NUCLEOSYNTHESIS ; ENRICHMENT PATTERN ; MODEL ATMOSPHERES
收录类别	SCI
语种	英语
WOS记录号	WOS:000385820100021
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6847]
专题	国家天文台_光学天文研究部
作者单位	1.Hebei Normal Univ, Dept Phys, 20 South 2nd Ring Rd East, Shijiazhuang 050024, Peoples R China 2.Shandong Univ, Sch Space Sci & Phys, Weihai 264209, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Meng, X. Y.,Cui, W. Y.,Shi, J. R.,et al. The odd-isotope fractions of barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001[J]. ASTRONOMY & ASTROPHYSICS,2016,593.
APA	Meng, X. Y..,Cui, W. Y..,Shi, J. R..,Jiang, X. H..,Zhao, G..,...&Li, J..(2016).The odd-isotope fractions of barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001.ASTRONOMY & ASTROPHYSICS,593.
MLA	Meng, X. Y.,et al."The odd-isotope fractions of barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001".ASTRONOMY & ASTROPHYSICS 593(2016).