ABSTRACT We evaluate the rotational velocity of stars observed by Pristine survey towards Galactic anticentre spanning a wide range metallicities from extremely metal-poor regime ([Fe/H] < ?3) to nearly solar metallicity. In direction, (V?) is similar tangential in galactic longitude direction (V?). This allows us estimate V? Gaia early data release 3 (Gaia EDR3) proper motions for witho...

Ancient, very metal-poor stars offer a window into the earliest epochs of galaxy formation and assembly. We combine data from H3 Spectroscopic Survey Gaia to measure metallicities, abundances $\alpha$ elements, stellar ages, orbital properties sample 482 (VMP; [Fe/H]$<-2$) in order constrain their origins. This is confined $1\lesssim |Z| \lesssim3$ kpc Galactic plane. find that >70% VMP near di...

Silicon and Strontium are key elements to explore the nucleosynthesis chemical evolution of Galaxy by measurements very metal-poor stars. There are, however, only a few useful spectral lines these in optical range that measurable for such low-metallicity Here we report on abundances two determined from near-infrared high-resolution spectra obtained with Subaru Telescope Infrared Doppler instrum...