Studying a range of old metal-poor stars provides information over cosmological timescales of our Galaxy .
Such studies are indicative of the pristine gases and evolution of the Milky Way .
Deriving stellar parameters and abundances from high-resolution observations of stars at various stellar evolution stages ( including old dwarfs and RR Lyrae ) , allows us to use these abundances as tracers of an even earlier progenitor population .
Here , we carry out a detailed abundance study of mainly heavy elements ( Z > 38 ) , i.e .
neutron-capture elements , which we at low metallicities ( [ Fe/H ] < -2.5 ) take as pure supernova type II products .
A comparison of the derived abundances to type II supernova yields of heavy elements provides knowledge of the old stellar generations as well as properties of neutron-capture formation sites .