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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
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume368Issue:1Pages:305-309
AbstractSeveral 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.
KeywordStars Agb And post-Agb Stars Mass-loss
DOI10.1111/j.1365-2966.2006.10109.x
Indexed BySCI
Language英语
WOS IDWOS:000236797600041
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8944
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China
Recommended Citation
GB/T 7714
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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