Detailed investigation of two high?speed evolved Galactic stars

The study of metal poor stars provides clarification and knowledge about the primordial Universe. Specially, halo provide explanations nature first generations nucleosynthesis in metal-poor regime. We present a detailed chemical analysis determination kinematic orbital properties two characterized by high speed with respect to Sun. analyzed high-resolution Subaru spectra employing MyGIsFOS code, which allows derive abundances for 28 elements (C, N, O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu), abundance from ionization states case four (Ti, Zr). TYC 622–742–1 1193–1918–1 are ([Fe/H] ?2.37 ?1.60), they similar pattern enhanced show slight excess Eu abundance. Both giant C rich as expected evolved stars, this fact is supported low isotopic ratio 1193–1918–1. Nevertheless, particularly low. have composition other Galactic comparable metallicity. According their kinematics, both belong halo, but not part Gaia-Sausage-Enceladus structure.