2004/02/12 by S. Honda, Satoshi Honda, W. Aoki +30 · 1 citation
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Dispersion (optics) #Materials science #Metal #Nucleosynthesis #Optics #Physics #Radial velocity #Spectral line #Spectrograph #Stars #Stellar, planetary, and galactic studies #Subaru Telescope #astro-ph
paper · pdf · doi:10.1086/383201
31 pages, 17 Postscript figures, accepted for publication in ApJS
arxiv created 2004/02/12 · openalex publication_date 2004/04/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have obtained high-resolution ( R ≃ 50,000 or 90,000), high-quality (S/N ≳ 100) spectra of 22 very metal-poor stars ([Fe/H] ≲ -2.5) with the High Dispersion Spectrograph fabricated for the 8.2 m Subaru Telescope. The spectra cover the wavelength range from 3500 to 5100 Å; equivalent widths are measured for isolated lines of numerous elemental species, including the α-elements, the iron-peak elements, and the light and heavy neutron-capture elements. Errors in the measurements and comparisons with previous studies are discussed. These data will be used to perform detailed abundance analyses in the following papers of this series. Radial velocities are also reported and are compared with previous studies. At least one moderately r -process-enhanced metal-poor star, HD 186478, exhibits evidence of a small-amplitude radial velocity variation, confirming the binary status noted previously. During the course of this initial program, we have discovered a new moderately r -process-enhanced, very metal-poor star, CS 30306-132 ([Fe/H] = -2.4; [Eu/Fe] = +0.85), which is discussed in detail in the companion paper.