  Elemental abundances of CH stars can provide observational constraints for
theoretical studies on the nucleosynthesis and evolution of low- and
intermediate-mass stars. However, available abundance data in literature are
quite scanty. In our pursuit to generate a homogeneous database of elemental
abundances of CH stars we have performed a detailed chemical abundance study
for a sample of 12 potential CH star candidates based on high resolution
spectroscopy. We present first time abundance analysis for the objects HE
0308-1612, CD-28 1082, HD 30443, and HD 87853. For the other objects, although
limited information is available, detailed chemical composition studies are
missing. Our analysis shows CD-28 1082 to be a very metal-poor object with
[Fe/H] = -2.45 and enriched in carbon with [C/Fe] = 2.19. With a ratio of
[Ba/Eu] ~ 0.02 the star satisfies the classification criteria of a CEMP-r/s
star. The objects CD-38 2151 with [Fe/H] = -2.03 and HD 30443 with [Fe/H] ~
-1.68 are found to show the characteristic properties of CH stars. HE 0308-1612
and HD 87853 are found to be moderately metal-poor with [Fe/H]~ -0.73; while HE
0308-1612 is moderately enhanced with carbon ([C/Fe] ~ 0.78) and shows the
spectral properties of CH stars, the abundance of carbon could not be estimated
for HD 87853. Among the two moderately metal-poor objects, HD 87080 ([Fe/H] =
-0.48) shows near solar carbon abundance, and HD 176021 ([Fe/H] = -0.63) is
mildly enhanced in carbon with [C/Fe] = 0.52. HD 176021 along with HD 202020 a
known binary, exhibit the characteristic properties of CH stars as far as the
heavy element abundances are concerned. Five objects in our sample show
spectral properties that are normally seen in barium stars.
