Palladium and silver abundances in stars with [Fe/H] >-2.6

	Palladium and silver abundances in stars with [Fe/H] >-2.6
	Wu, Xiaoshu1,2,3 ; Wang, Liang1 ; Shi, Jianrong1 ; Zhao, Gang1 ; Grupp, Frank 3
刊名	ASTRONOMY & ASTROPHYSICS
	2015-07-01
卷号	579
关键词	stars: abundances stars: Population II Galaxy: evolution
英文摘要	Palladium (Pd) and silver (Ag) are the key elements for probing the weak component in the rapid neutron-capture process (r-process) of stellar nucleosynthesis. We performed a detailed analysis of the high-resolution and high signal-to-noise ratio near-UV spectra from the archive of HIRES on the Keck Telescope, UVES on the VLT, and HDS on the Subaru Telescope, to determine the Pd and Ag abundances of 95 stars. This sample covers a wide metallicity range with -2.6 less than or similar to [Fe/H] less than or similar to +0.1, and most of them are dwarfs. The plane-parallel local thermodynamic equilibrium MAFAGS-OS model atmosphere was adopted, and the spectral synthesis method was used to derive the Pd and Ag abundances from Pd I lambda 3404 angstrom and Ag I lambda. 3280/3382 angstrom lines. We found that both elements are enhanced in metal-poor stars, and their ratios to iron show flat trends at -0.6 < [Fe/H] < +0.1. The abundance ratios of [Ag/H] and [Pd/H] are well correlated over the whole abundance range. This implies that Pd and Ag have similar formation mechanisms during the Galactic evolution.
收录类别	SCI
语种	英语
WOS记录号	WOS:000358877100020
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5644]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
推荐引用方式 GB/T 7714	Wu, Xiaoshu,Wang, Liang,Shi, Jianrong,et al. Palladium and silver abundances in stars with [Fe/H] >-2.6[J]. ASTRONOMY & ASTROPHYSICS,2015,579.
APA	Wu, Xiaoshu,Wang, Liang,Shi, Jianrong,Zhao, Gang,&Grupp, Frank.(2015).Palladium and silver abundances in stars with [Fe/H] >-2.6.ASTRONOMY & ASTROPHYSICS,579.
MLA	Wu, Xiaoshu,et al."Palladium and silver abundances in stars with [Fe/H] >-2.6".ASTRONOMY & ASTROPHYSICS 579(2015).