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26 April 2024 |
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Article overview
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Palladium and silver abundances in stars with [Fe/H] > -2.6 | | Xiaoshu Wu
; Liang Wang
; Jianrong Shi
; Gang Zhao
; Frank Grupp
; | | Date: |
17 May 2015 | | Abstract: | 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 $lesssim$ [Fe/H] $lesssim$ +0.1, and most of them are dwarfs.
The plane-parallel LTE 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 {AA} and Ag I {lambda} 3280/3382 {AA} 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. | | Source: | arXiv, 1505.4356 | | Services: | Forum | Review | PDF | Favorites | |
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