Abstract
We have studied the giant 20 Peg using high-resolution spectra. We derive the star’s effective temperature, Teff=6970 K, gravity, logg=3.35, and microturbulence velocity from FeI lines, ξt=2.70 km/s, and from NiI lines, ξt=2.45 km/s. The abundances of carbon, logɛ(C)=8.78, nitrogen, logɛ(N)=8.28, and silicon, logɛ(Si)=7.85, are enhanced compared to the solar values by 0.23, 0.31, and 0.30 dex, respectively. The abundances of oxygen, logɛ(O)=8.83, sodium, logɛ(Na)=6.37, and sulfur, logɛ(S)=7.33, are nearly solar. Calcium and nickel show normal abundances, logɛ(Ca)=6.44 and logɛ(Ni)=6.32. Iron logɛ(Fe)=7.63 and yttrium logɛ(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 logɛ(Ba)=3.08.
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