Abstract
Carbon, oxygen, and s-process abundances, as well as abundances of other metals, such as iron, calcium, or nickel, are presented for a sample of nine CH subgiants. The abundances are derived from high-resolution, high-S/N spectra. The CH subgiants in this sample are found to have mild metal-deficiencies ([Fe/H]≃0.0 to −0.4), a range of s-process overabundances ([s-process/Fe]≃ + 0.2 to + 1.0), and C/O ratios from 0.4 to 2.0. When compared to the barium giant stars, the CH subgiants tend to have larger C/O ratios, however, the barium giants have deep convective envelopes that are presumably absent from the CH subgiants, which lie on, or near, the main sequence
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