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Information × Registration Number 0210U000153, 0106U012584 , R & D reports Title Chemical compoыешщт of supergiants of classes A, F, G and a problem of lithium in СР-stars popup.stage_title Head Lyubimkov Leonid S., Registration Date 25-01-2010 Organization Scientific-research institute "Crimean astrophysical observatory" popup.description2 A number of fundamental parameters are determined for 63 A-, F- and G-type Galactic supergiants. Due to use of a new reduction of stellar parallaxes an unprecedented accuracy is obtained in the derivation of two very important parameters, namely the effective temperature Teff and the surface gravity log g. For all these stars the iron abundance is determined; for the first time it is shown for A, F and G supergiants that the metallicity of such young stars and the Sun is the same. One more roAp-type star is discovered, namely HD 12098; the lithium line LiI 6708 in its spectrum revealed strong variations. The variety of this line is explained by a presence of "lithium spots" on the star's surface, and the location of the spots connects with the location of magnetic poles. Product Description popup.authors Любiмков Леонiд Сергійович Поклад Дмитро Борисович Полосухіна Ніна Савельєвна Рачковська Тамара Михайлiвна popup.nrat_date 2020-04-02 Close