Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..107h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 107-116.
Astronomy and Astrophysics
Astrophysics
25
Balmer Series, H Ii Regions, Protostars, Stellar Luminosity, Stellar Models, Thermodynamic Equilibrium, Continuous Radiation, Energy Distribution, Ionized Gases, Stellar Spectra, Stellar Winds
Scientific paper
NLTE model photospheres surrounded by spherical envelopes with density distributions rho proportional to 1/r exp n in order to interpret cocoon stars similar to the Becklin-Neugebauer object. Both parts are assumed to be in radiative equilibrium. With these models the existence of extended H II regions around stars with luminosites of B main-sequence stars can be understood as a consequence of photoionizations by Balmer continuum photons, bound-bound collisions, large optical depths in hydrogen lines due to small escape probabilities of photons, and high photon densities in the optically thin continua. For several relatively well observed objects the atmospheric and shell parameters are derived. The observed line fluxes and line ratios are in general well reproduced. Calculated and observed radio fluxes are consistent. Possibilities for the reduction of uncertainties (e.g., in the luminosities) by specific additional observations are discussed.
Hoeflich Peter
Wehrse Rainer
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