The study of s-process nucleosynthesis based on barium stars, CEMP-s and CEMP-r/s stars

The study of s-process nucleosynthesis based on barium stars, CEMP-s and CEMP-r/s stars
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基于钡星、CEMP-s和CEMP-r/s星的s过程核合成研究

DOI:
10.1007/s10509-013-1450-1
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发表时间:
2013-04
影响因子:
1.9
通讯作者:
Zhang Bo
Zhang Bo
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Zhang Caixia;Meng Xiaoying;Shao Lang;Zhang Bo

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为了更广泛地了解 s 过程核合成,我们研究了 35 颗钡星和 24 颗 CEMP-星的重元素丰度分布,其中包括 9 颗 CEMP-s 星和 15 颗 CEMP-r/s 星。 CEMP-s 和 CEMP-r/s 恒星之间 [Pb/hs] 的相似分布表明,CEMP-s 和 CEMP-r/s 恒星的 s 过程材料应该具有统一的来源,即来自其主要 AGB 伴星的质量转移。对于 CEMP-r/s 恒星,我们发现 r 过程应该对第二个 s 峰和第三个 s 峰元素提供类似的比例贡献,并且还导致比 CEMP-s 恒星更高的重元素过剩。这暗示CEMP-r/s星的r过程起源应该与主r过程密切相关。事实上,钡和 CEMP-s 恒星都存在一些较小的值,这意味着 s 过程核合成的单次暴露事件应该在我们银河系的广泛金属丰度范围内普遍存在。根据Cr和Cs之间的关系,我们认为CEMP-r/s星的r元素来源有更多的来源。一种常见的情况是双星系统的形成仅由一颗或几颗超新星触发。此外,吸积引起的塌陷(AIC)或SN 1.5应该是补充情景,特别是对于那些具有较高质量和较小轨道半径的前AGB伴星,它们支持较高的Cr和Cs值。
In order to get a broader view of the s-process nucleosynthesis we study the abundance distribution of heavy elements of 35 barium stars and 24 CEMP-stars, including nine CEMP-s stars and 15 CEMP-r/s stars. The similar distribution of [Pb/hs] between CEMP-s and CEMP-r/s stars indicate that the s-process material of both CEMP-s and CEMP-r/s stars should have a uniform origin, i.e. mass transfer from their predominant AGB companions. For the CEMP-r/s stars, we found that the r-process should provide similar proportional contributes to the second s-peak and the third s-peak elements, and also be responsible for the higher overabundance of heavy elements than those in CEMP-s stars. Which hints that the r-process origin of CEMP-r/s stars should be closely linked to the main r-process. The fact that some smallrvalues exist for both barium and CEMP-s stars, implies that the single exposure event of the s-process nucleosynthesis should be general in a wide metallicity range of our Galaxy. Based on the relation betweenCrandCs, we suggest that the origin of r-elements for CEMP-r/s stars have more sources. A common scenario is that the formation of the binary system was triggered by only one or a few supernova. In addition, accretion-induced collapse(AIC) or SN 1.5 should be the supplementary scenario, especially for these whose pre-AGB companion with higher mass and smaller orbit radius, which support the higher values of bothCrandCs.
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