Abundance of carbon A(C) vs. [Fe/H] in dwarfs and turn-off galactic CEMP stars from the literature (blue squares). Only the determinations obtained from high-resolution spectra were selected. The measurements made homogeneously by our team are represented with open blue circles. The dashed blue line (representing [C/Fe] = +1) separates the region of the carbon-rich metal-poor stars from the region of the normal metal-poor stars. On the upper A(C) band (yellow zone) all the stars but four are Ba-rich. On the contrary, on the lower A(C) band (hatched blue zone) all the stars are CEMP-no. Below [Fe/H] = −3.4 all the CEMP stars belong to the second group. The Pisces II 10694 star is represented by a red filled star and the CEMP giants in the dwarf galaxies Sculptor, Boo I and Seg I, by open red stars. The galactic giant CS 22949-037 is represented by a filled green square.
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