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Palladium (Pd) and silver (Ag) are the key elements for probing the weakcomponent in the rapid neutron-capture process (r-process) of stellarnucleosynthesis. We performed a detailed analysis of the high-resolution andhigh signal-to-noise ratio near-UV spectra from the archive of HIRES on theKeck telescope, UVES on the VLT, and HDS on the Subaru Telescope, to determinethe Pd and Ag abundances of 95 stars. This sample covers a wide metallicityrange 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 spectralsynthesis 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 thatboth elements are enhanced in metal-poor stars, and their ratios to iron showflat 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 Aghave similar formation mechanisms during the Galactic evolution.

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