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Paper: Anomalies in the Balmer and Lyman Continuum and their Relation to the Thermodynamical and Dynamical Status of the Stellar Envelope
Volume: 361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics
Page: 422
Authors: Cruzado, A.; Vazquez, A.C.; Ringuelet, A.E.
Abstract: In order to match theoretical and observed spectra of Be and B[e] stars in the Lyman and Balmer continua regions, we solve the transfer problem, by means the Implicit Integral Method, in an stellar envelope where different temperature and density distributions are assumed and departures from equilibrium are allowed to occur for the gas state. We conclude that departures from equilibrium of the Hydrogen level populations in a thin region close to the star determine a second Balmer jump in emission or absorption, depending on whether the H levels are underpopulated or overpopulated respect to their equilibrium values. Therefore, the observed Balmer continuum of Be stars allows us to infer the physical conditions in the region of the envelope close to the star.
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