Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..231s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 288, no. 1, p. 231-254
Astronomy and Astrophysics
Astrophysics
71
Hot Stars, Hydrodynamics, Stellar Atmospheres, Stellar Composition, Stellar Luminosity, Stellar Mass, Stellar Models, Stellar Spectra, Stellar Winds, Abundance, Equations Of Motion, Helium, Hydrogen, Ionization, Line Spectra, Local Thermodynamic Equilibrium, Metallicity, Radiative Transfer, Temperature Distribution
Scientific paper
We present the first line blanketed hydrodynamic models of spherically expanding atmospheres of hot stars. The models are characterized by a simultaneous solution of the equation of motion, the Non-Local Thermodynamic Equilibrium (non-LTE) populations of hydrogen and helium, and radiation transfer in a line blanketed atmosphere. The entire domain from the optically thick photosphere out to the terminal velocity of the wind is treated. The radiative forces are evaluated consistently with the depth-dependent radiation field, taking into account multiple scattering by metal lines and line overlap. This allows us to determine mass loss rates and the velocity field resp. density structure, as well as to predict the line blanketed energy distribution, the photospheric absorption lines, and the emission features emerging from the wind. We present a detailed discussion of the influence of the photosphere-wind transition zone on line profiles and the effects of line blanketing on a hydrodynamic non-LTE model atmosphere.
Schaerer Daniel
Schmutz Werner
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