The paper presents the results of an analysis of elemental abundances in th
e atmosphere of eta Ser-a red giant of spectral type K2IIIabCN1, according
to Hoffleit and Jaschek [4]. The resulting atmospheric parameters correspon
d to a K0 giant, and the peculiarities of the star's chemical composition p
rovide evidence that the assignment of eta Ser to the class of CN stars was
erroneous. (C) 2001 MAIK "Nauka/Interperiodica".