摘要：AbstractPhotospheric parameters and chemical composition are determined for the single-lined chromospherically active RS CVn-type star 29 Draconis (HD 160538). From the high resolution spectra obtained on the Nordic Optical Telescope, abundances of 22 chemical elements, including the key elements such as12C,13C, N and O, were investigated. The differential line analysis with the MARCS model atmospheres gives Teff= 4720 K, log g = 2:5, [Fe/H] = -0:20, [C/Fe] = -0:14, [N/Fe] = 0:08, [O/Fe] = -0:04, C/N = 2:40,12C/13C = 16. The low value of the12C/13C ratio gives a hint that extra mixing processes in low-mass chromospherically active stars may start earlier than the theory of stellar evolution predicts.
关键词：KeywordsstarsRS CVn binariesabundances starsindividual (29 Draconis = HD 160538))
