The detailed chemical composition of the atmosphere AY Cet (HD 7672) is
determined from a high-resolution spectrum in the optical region. The main
atmospheric parameters and the abundances of 22 chemical elements, including
key species such as 12C, 13C, N, and O, are determined. A differential line
analysis gives T_eff=5080 K, log g=3.0, [Fe/H]=-0.33, [C/Fe]=-0.17,
[N/Fe]=0.17, [O/Fe]=0.05, C/N=1.58, and 12C/13C=21. Despite the high
chromospheric activity, the optical spectrum of AY Cet provides a chemical
composition typical for first ascent giants after the first dredge-up.Comment: 11 figure
