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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  12 C,  13 C, 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  12 C/ 13 C = 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 (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Chemical composition of AY Ceti: A flaring, spotted star with a white dwarf companion