On atmospheric parameters and chemical composition of Giant HD 206731 (G8II)

By comparing observed and model characteristics of atmosphere, we determined fundamental and evolutionary parameters and chemical composition of giant HD 206731. Spectral class of stars G8 and luminosity class II. Spectral materials are obtained by CCD camera mounted on Cassegrain focus at Shamakha Astrophysical Observatory of NAS of Azerbaijan. It is found that Teff=5000±200 K, logg = 2.1±0.2, , , .By selected non-blended lines of Fe I, we determined the microturbulence velocity in stellar atmosphere which was found to be ξt=4km/h. The content of some chemical elements in the atmosphere of the studied star is determined. The results are compared with solar ones. Spectra processing is performed by program DECH 20. Equivalent widths of lines are averaged by the results of 4th series of observations. The error in determining equivalent widths makes about 5%.