Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63..310s&link_type=abstract
(Astronomicheskii Zhurnal, vol. 63, Mar.-Apr. 1986, p. 310-316) Soviet Astronomy (ISSN 0038-5301), vol. 30, Mar.-Apr. 1986, p. 1
Astronomy and Astrophysics
Astronomy
2
Main Sequence Stars, O Stars, Stellar Atmospheres, Stellar Models, Thermodynamic Equilibrium, Absorption Spectra, Line Spectra, Spectral Line Width, Stellar Temperature, Visible Spectrum
Scientific paper
Calculations of equivalent widths of N III multiplets λ4640 Å, λ4097 Å, λ4379 Å have been performed on the basis of a detailed solution of the coupled statistical-equilibrium and radiative-transfer equations for a multiline, multilevel, multi-ion ensemble and for non-LTE model atmospheres with Teff = 32500 - 55000K and lg g = 3.3, 3.5, 4.0, 4.5. The comparison of the observed equivalent widths with the calculated ones by non-LTE of H, He I, He II, C III, C IV, N III, N IV lines in the visual spectra of O-type stars permitted to establish that the model atmospheres with Teff and lg g determined from H and He lines satisfactorily predict also the behaviour of absorption and emission lines of light ions for 8 stars from the 10 investigated ones. The normal abundances of carbon and nitrogen have been used and the microturbulent velocity ξt was found to be 0 - 5 km/s.
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