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The origin of the lead-rich stars in the Galactic halo: investigation of model parameters for the s-process
Cui, WY; Zhang, B
2006-05-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号368期号:1页码:305-309
摘要Several stars at the low-metallicity extreme of the Galactic halo show large spreads of lead and associated 'heavy' s-process elements ([Pb/hs]). Theoretically, an s-process pattern should be obtained from an AGB star with a fixed metallicity and initial mass. For the third dredge-up and the s-process model, several important properties depend primarily on the core mass of AGB stars. Zijlstra reported that the initial-to-final mass relation steepens at low metallicity, due to low mass-loss efficiency. This might affect the model parameters of the AGB stars, e.g. the overlap factor and the neutron irradiation time, in particular at low metallicity. The calculated results do indeed show that the overlap factor and the neutron irradiation time are significantly small at low metallicities, especially for 3.0 M-circle dot AGB stars. The scatter of [Pb/hs] found in low metallicities can therefore be explained naturally when varying the initial mass of the low-mass AGB stars.
关键词Stars Agb And post-Agb Stars Mass-loss
DOI10.1111/j.1365-2966.2006.10109.x
收录类别SCI
语种英语
WOS记录号WOS:000236797600041
引用统计
被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8944
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China
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Cui, WY,Zhang, B. The origin of the lead-rich stars in the Galactic halo: investigation of model parameters for the s-process[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,368(1):305-309.
APA Cui, WY,&Zhang, B.(2006).The origin of the lead-rich stars in the Galactic halo: investigation of model parameters for the s-process.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,368(1),305-309.
MLA Cui, WY,et al."The origin of the lead-rich stars in the Galactic halo: investigation of model parameters for the s-process".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 368.1(2006):305-309.
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