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 HE0308 - 1612 , CD - 281082 , HD30443 , and HD87853 .
For the other objects , although limited information is available , detailed chemical composition studies are missing .
Our analysis shows CD - 281082 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 ] { \sim } 0.02 the star satisfies the classification criteria of a CEMP-r/s star .
The objects CD - 382151 with [ Fe/H ] = - 2.03 and HD30443 with [ Fe/H ] { \sim } - 1.68 are found to show the characteristic properties of CH stars .
HE0308 - 1612 and HD87853 are found to be moderately metal-poor with [ Fe/H ] { \sim } - 0.73 ; while HE0308 - 1612 is moderately enhanced with carbon ( [ C/Fe ] { \sim } 0.78 ) and shows the spectral properties of CH stars , the abundance of carbon could not be estimated for HD87853 .
Among the two moderately metal-poor objects , HD87080 ( [ Fe/H ] = - 0.48 ) shows near solar carbon abundance , and HD176021 ( [ Fe/H ] = - 0.63 ) is mildly enhanced in carbon with [ C/Fe ] =0.52 .
HD176021 along with HD202020 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 .