Abundances of carbon, nitrogen, oxygen, and other elements in the atmosphere of the giant 20 Peg

We have studied the giant 20 Peg using high-resolution spectra. We derive the star's effective temperature, T-eff = 6970 K, gravity, log(9) = 3.35, and microturbulence velocity from Fel lines, xi(t) = 2.70 km/s, and from Nil lines, xi(t) 2.45 km/s. The abundances of carbon, log is an element of(C) = 8.78, nitrogen, Iog is an element of(N) = 8.28, and silicon, log is an element of(Si) 7.85, are enhanced compared to the solar values by 0.23, 0.31, and 0.30 dex, respectively. The abundances of oxygen, log is an element of(O) = 8.83, sodium, log is an element of(Na) = 6.37, and sulfur, log is an element of(S) = 7.33, are nearly solar. Calcium and nickel show normal abundances, log is an element of(Ca) = 6.44 and log is an element of(Ni) = 6.32. Iron log is an element of(Fe) = 7.63 and yttrium log is an element of(Y) = 2.41 are only slightly overabundant compared to the solar values (by 0.13 and 0.17 dex). We find a rather large (0.95 dex) overabundance of barium log is an element of(Ba) = 3.08. (C) 2002 MAIK "Nauka/Interperiodica".