RS CVn型λ型恒星的化学组成
Chemical Composition of the RS CVn-TYPE Star Lambda Andromedae
摘要：
测定了单线色球活动RS CVn型星λ And（HD 222107）的光球参数和化学组成。根据北欧光学望远镜获得的高分辨率光谱，研究了22种化学元素和同位素的丰度，包括12 C，13 C，N和O等关键元素。用MARCS模型大气进行的微分线分析给出T eff=4830 K，log g=2.8，[Fe/H]=-0.53，[C/Fe]=0.09，[N/Fe]=0.35，[O/Fe]=0.45，C/N=2.21，12 C/13 C = 14。RS CVn型恒星的12 C/13 C比值是首次确定的，它的低值暗示了额外的混合过程可能开始作用于红巨星光度函数凸点以下的低质量色球活动恒星。
英文摘要：
Photospheric parameters and chemical composition are determined for the single-lined chromospherically active RS CVn-type star λ And (HD 222107). From the high resolution spectra obtained on the Nordic Optical Telescope, abundances of 22 chemical elements and isotopes, including such key elements as 12C, 13C, N and O, were investigated. The differential line analysis with the MARCS model atmospheres gives T eff=4830 K, log g=2.8, [Fe/H]=-0.53, [C/Fe]=0.09, [N/Fe]=0.35, [O/Fe]=0.45, C/N=2.21, 12C/13C = 14. The value of 12C/13C ratio for a star of the RS CVn-type is determined for the first time, and its low value gives a hint that extra-mixing processes may start acting in low-mass chromospherically active stars below the bump of the luminosity function of red giants.
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