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Information × Registration Number 0306U003271, 0103U002156 , R & D reports Title Evolution of chemical composition of high amd medium mass stars popup.stage_title Визгначення фундаментальних параметрів спостережених надгігінтів і гігантів Head Lubimkov L.S., Registration Date 27-02-2006 Organization Scientific-research institute "Crimean astrophysical observatory" popup.description2 Spectral observations of a large sample of the A-, F- and G-type supergiants were continued on the 2.7 m telescope of the McDonald Observatory in the USA. Spectrum of the chemically peculiar B star HR 1512 of the rare "helium-weak" type was studied in detail. It was shown that a feature of its chemical composition is the significant overabundance of phosphorus, manganese, chromium, nickel and neon, as well as the underabundance of helium, nitrogen, magnesium, silicon and sulphur. A number of empirical correlations for the phosphorus abundance were found that indicates a stratification of this element in atmosphere of the star HR 1512. For their explanation a probable dependence of the phosphorus abundance on height in the atmosphere was constructed. Product Description popup.authors popup.nrat_date 2020-04-02 Close