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Title: Origin of the broad H-alpha wings in symbiotic binaries.
Authors: A. Skopal
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Description: The extreme broad emission wings of the hydrogen H-alpha line in the spectra of interacting binaries represents a pivotal problem of their astrophysics. To date models considering rotating discs, scattering on free electrons and/or radiative damping in lines were elaborated. Recently a theory of the Raman scattering Ly-beta photons on neutral atoms of hydrogen was developed. The aim of the current study was to suggest a rivaling alternative to explain the significant broadening of the H-alpha line during outbursts that is consistent with the structure of the active object. In the model I assumed that the broad H-alpha wings are produced by ionized hydrogen. I found that the broad wings can be formed in the high-velocity stellar wind from the hot star. By this way the active star loses a fraction of its mass at rates of approximately 1x10E-6 solar masses per year. The radiation produced by the H-alpha line is consistent with the radio observations. The suggested model has implications for investigation of the mass-loss from other astrophysical objects, as AGB stars, planetary nebulae or the active galactic nuclei. In the symbiotic star research this study represents an important ingredient of the structure of active objects
Reference: Astronomy & Astrophysics 457, 1003-1010 (2006)
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Date and Time: 1.11. 2014 11:02:16 CET
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