Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987afz....26..195l&link_type=abstract
(Astrofizika, vol. 26, Mar.-Apr. 1987, p. 195-208) Astrophysics (ISSN 0571-7132), vol. 26, no. 2, Sept. 1987, p. 117-125. Transl
Astronomy and Astrophysics
Astrophysics
4
Binary Stars, Light Elements, Stellar Atmospheres, Stellar Composition, Absorption Spectra, Abundance, Hydrogen, Line Spectra, Stellar Evolution, Stellar Spectra
Scientific paper
The synthetic spectrum method is used to determine the chemical composition in the atmosphere of the principal component of the binary system Upsilon Sgr. A model atmosphere with parameters Te = 13,500 K, log g = 1.5, N(H)/Sigma N = 0.0005, N(He)/Sigma N = 0.95 is used. Good agreement is achieved between the calculated sections of the spectrum and observations. The obtained abundances of hydrogen, helium, carbon, nitrogen, and oxygen suggest that in the core of the principal component hydrogen has been burnt into helium through the CNO cycle and helium transformed into carbon.
Leushin V. V.
Topil'Skaia G. P.
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