Emission-line spectra of H II regions - Dependence on metal abundances in the atmosphere of the ionizing star and in the nebular gas

Astronomy and Astrophysics – Astrophysics

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Emission Spectra, H Ii Regions, Line Spectra, Metallicity, Nebulae, Stellar Atmospheres, Abundance, Cosmic Gases, Electron Energy, Infrared Spectra, Light (Visible Radiation)

Scientific paper

Model H II regions, based on line-blanketed LTE model atmospheres of the central star, have been calculated for varying nebular and stellar metal contents. The nebular ionization structure is dominated by the metallicity of the star, whereas the nebular electron temperature is primarily determined by the metallicity of the gas. The strengths of emission-lines relative to H mainly depend on the electron temperature and, hence, are much more sensitive to the nebular than to the stellar metallicity.

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