Abundances of carbon, nitrogen, oxygen, and other elements in the atmosphere of the giant 20 Peg |
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| Authors: | T M Rachkovskaya |
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| Institution: | (1) Crimean Astrophysical Observatory, Nauchnyi, Crimea, 98409, Ukraine |
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| Abstract: | We have studied the giant 20 Peg using high-resolution spectra. We derive the star’s effective temperature, T eff=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, log?(C)=8.78, nitrogen, log?(N)=8.28, and silicon, log?(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?(O)=8.83, sodium, log?(Na)=6.37, and sulfur, log?(S)=7.33, are nearly solar. Calcium and nickel show normal abundances, log?(Ca)=6.44 and log?(Ni)=6.32. Iron log?(Fe)=7.63 and yttrium log?(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?(Ba)=3.08. |
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