Mathematics – Probability
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt........11h&link_type=abstract
Ph.D. Thesis Heidelberg Univ. (Germany, F.R.). Naturwissenschaftlich Mathematischen Gesamtfakultaet.
Mathematics
Probability
3
B Stars, Mathematical Models, Nonequilibrium Radiation, Stellar Envelopes, Stellar Luminosity, Emission Spectra, Line Spectra, Photosphere, Radiation Transport, Stellar Atmospheres, Stellar Spectra
Scientific paper
A model for objects with envelopes and luminosities like B stars is presented. The model is characterized by spherical symmetry, consistent treatment of envelope and photosphere, NLTE for hydrogen, radiation equilibrium, stationarity, exact radiation transport and density structures. The dependencies of the physical conditions in the envelopes and of the spectra on the model parameters are discussed. The importance of an exact physical treatment for the understanding of the existence of HII regions and for the interpretation of the spectra, is demonstrated. In contrast with classical HII regions, photoionization by Lyman photons plays only a secondary role. The main reasons for the maintenance of the HII region are photoionization by Balmer photons, bound-bound collisions, low escape probability for line photons, and high radiation densities in optically thin continua.
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