Probing the Nucleosynthetic Contribution of Low-metallicity, Low-mass Star Companions of CEMP Stars*

The observed abundance diversities among CEMP stars can shed light on the formation and evolution of elements in early Galaxy. In this work, we present results obtained from a detailed analysis sample seven extrinsic carbon stars. is based high-resolution spectra with HCT/HESP (R∼60,000) SUBARU/HDS (R∼50,000). We present, for first time, elemental objects BD−19 132, 290, HE 1304−2111, 1354−2257, BD+19 3109. Abundances few are available literature 1157−0518 HD 202851; an update abundances these along new estimates several other elements. Our confirms object 202851 to be CH star. While 3109 found CEMP-s stars, 1157−0518, 1304−2111 belong CEMP-r/s group. patterns three well reproduced i-process model predictions. confirmed binaries, binary status remaining not known. Analysis different ratios low-mass former AGB companions all objects. Kinematic shows that Galactic halo, whereas members thin disk.