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We present the result of chemical abundances of a mild barium star HD202109(zeta Cyg) determined from the analysis of spectrum obtained by using a 2-mtelescope at the Peak Terskol Observatory and a high-resolution spectrometerwith R=80,000, signal to noise ratio >100. We also present the atmosphericparameters of the star determined by using various methods including iron-lineabundance analysis. For line identifications, we use whole-range syntheticspectra computed by using the Kurucz database and the latest lists of spectrallines. Among the determined abundances of 51 elements, those of P, S, K, Cu,Zn, Ge, Rb, Sr, Nb, Mo, Ru, Rh, Pd, In, Sm, Gd, Tb, Dy, Er, Tm, Hf, Os, Ir, Pt,Tl, and Pb have not been previously known. Under the assumption that theoverabundance pattern of Ba stars is due to wind-accretion process, addinginformation of more element abundances enables one to show that the heavyelement overabundances of HD202109 can be explained with the wind accretionscenario model.Comment: 10 pages, Accepted by Astronomy and Astrophysic

The chemical composition of the mild barium star HD 202109