Abstract
Using the 1-0 C 2 Swan Band at 4737 A and the CN red system 2-0 band near 8000 A, the ratio of stable carbon isotopes, 12 C/ 13 C, has been determined for eight CH giants. For a majority of the sample stars, we find that 12 C/ 13 C∼3 near the equilibrium value of the CN cycle, though there seems to be a second population of CH stars with high isotope ratios ( 12 C/ 13 C≥25). This range of ratios is the same as found for the Population II giants and globular cluster giant stars
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