Spectrophotometric analysis of the primary component of V 380 CYG

Details Spectrophotometric analysis of the primary component of V 380 CYG Spectrophotometric analysis of the primary component of V 380 CYG

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986afz....25..261l&link_type=abstract

(Astrofizika, vol. 25, Sept.-Oct. 1986, p. 261-277) Astrophysics (ISSN 0571-7132), vol. 25, no. 2, March 1987, p. 503-513. Trans

Astronomy and Astrophysics

Astrophysics

2

Eclipsing Binary Stars, Stellar Atmospheres, Stellar Composition, Stellar Spectra, Stellar Spectrophotometry, Atmospheric Models, Helium, Hydrogen, Spectrograms, Temperature Distribution

Scientific paper

The curve-of-growth method and spectrograms obtained with the 6-m telescope were used to determine the parameters of the atmosphere of the primary component of the close binary system V 380 Cyg: Te = 22,500 K, log g = 3.4, Vt = 3.28 km/sec. The value of log g is confirmed by comparison of the observed profiles and the equivalent widths of the hydrogen lines with the theoretical results. The method of model atmospheres was used to determine the chemical composition. For the majority of elements, excesses of the abundances from 0.2 to 1.0 in the logarithm of the number of atoms were found; the helium abundance was found to be two times greater than the solar abundance, the calcium abundance 0.3 dex less than solar value.

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