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The chemical abundances of very metal-poor stars provide importantconstraints on the nucleosynthesis of the first generation of stars and earlychemical evolution of the Galaxy. We have obtained high-resolution spectra withthe Subaru Telescope for candidates of very metal-poor stars selected with alarge survey of Galactic stars carried out with LAMOST. In this series ofpapers, we report on the elemental abundances of about 400 very metal-poorstars and discuss the kinematics of the sample obtained by combining the radialvelocities measured in this study and recent astrometry obtained with Gaia.This paper provides an overview of our survey and follow-up program, andreports radial velocities for the whole sample. We identify seven double-linedspectroscopic binaries from our high-resolution spectra, for which radialvelocities of the components are reported. We discuss the frequency of suchrelatively short-period binaries at very low metallicity.

Four-hundred Very Metal-poor Stars studied with LAMOST and Subaru. I. Survey Design, Follow-up Program, and Binary Frequency