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Information × Registration Number 0212U005938, 0109U008875 , R & D reports Title Chemical composition of B-, A- and G-stars of different luminosity classes popup.stage_title Head Lyubimkov Leonad Sergeevich, Registration Date 15-01-2013 Organization Scientific-research institute "Crimean astrophysical observatory" popup.description2 For a large sample of B stars, that are on the main sequence evolutionary stage, a non-LTE analysis of the C, N and O abundances is implemented from C II, N II and O II lines. The main result is an excellent agreement of the derived mean N and O abundances with the solar N and O abundances. Therefore, it is confirmed that the metallicity of the Sun and young stars in its neighbourhood is identical. The problem of metallicity of young stars is solved also by another way: abundances of two elements of the iron group, Cr and Ti, are studied for A-, F- and G-supergiants. These abundances showed good agreement with the solar Cr and Ti abundances. Monitoring of 10 magnetic Ap stars with fast rotation is performed, which display the variable lithium line Li I 6708 ?. The star HD 50635 was of special interest, because a shift of the lithium 6708 ? line to the long-wavelength spectral region is found, which can give evidence of the enhanced abundance of the lithium isotope 6Li. Product Description popup.authors Поклад Дмитро Борисович Полосухіна-Чуваєва Ніна Савелівна Рачковська Тамара Михайлівна Смірнова Марина Олександрівна popup.nrat_date 2020-04-02 Close