2006/02/06 by S. Honda, Satoshi Honda, W. Aoki +7 · 229 citations
Chemistry · Physics and Astronomy · #Abundance (ecology) #Astro and Planetary Science #Astronomy #Astrophysics #Chemistry #Gamma-ray bursts and supernovae #Metal #Neutron #Neutron capture #Neutron star #Nuclear physics #Nucleosynthesis #Physics #Spectral line #Spectrograph #Stars #Stellar, planetary, and galactic studies #Subaru Telescope #astro-ph #r-process
paper · pdf · doi:10.1086/503195
published in The Astrophysical Journal 643(2), 1180-1189 (IOP Publishing) · 29 pages, 7 figures, Accepted for publication in ApJ
arxiv created 2006/02/06 · openalex publication_date 2006/06/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We obtained high-resolution, high signal-to-noise ratio (S/N) spectroscopy for the very metal poor star HD 122563 with the Subaru Telescope High Dispersion Spectrograph. Previous studies have shown that this object has excesses of light neutron-capture elements, while its abundances of heavy ones are very low. In our spectrum, which covers 3070-4780 Å of this object, 19 neutron-capture elements have been detected, including seven for the first time in this star (Nb, Mo, Ru, Pd, Ag, Pr, and Sm). Upper limits are given for five other elements including Th. The abundance pattern shows a gradually decreasing trend, as a function of atomic number, from Sr to Yb, which is quite different from those in stars with excesses of r -process elements. This abundance pattern of neutron-capture elements provides new strong constraints on the models of nucleosynthesis responsible for the very metal poor stars with excesses of light neutron-capture elements but without enhancement of heavy ones.