Abundances of Carbon, Nitrogen, Oxygen, and Other Elements in the Atmosphere of the Giant 20 Peg

Details Abundances of Carbon, Nitrogen, Oxygen, and Other Elements in the Atmosphere of the Giant 20 Peg Abundances of Carbon, Nitrogen, Oxygen, and Other Elements in the Atmosphere of the Giant 20 Peg

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002arep...46..760r&link_type=abstract

Astronomy Reports, Vol. 46, Issue 9, pp. 760-764

Astronomy and Astrophysics

Astronomy

Scientific paper

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, 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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