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