Context. In recent observations of extremely metal-poor, low-mass, starburst galaxies, almost solar Fe/O ratios are reported, despite N/O consistent with the low metallicity. Aims. We aim to investigate if peculiar can be a distinctive signature an early enrichment produced by very massive objects dying as pair-instability supernova (PISN). Methods. ran chemical evolution models yields that acc...

Abstract We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with Subaru Telescope. It is largest high-resolution VMP sample (including 363 new objects) studied by a single program, first attempt to accurately determine evolutionary stages such large Gaia parallaxes. The covers wide metallicity r...