Expanding Atmospheric Model Including a Chromosphere. I. Study of the Infrared Excess in Be Stars

Details Expanding Atmospheric Model Including a Chromosphere. I. Study of the Infrared Excess in Be Stars Expanding Atmospheric Model Including a Chromosphere. I. Study of the Infrared Excess in Be Stars

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..286v&link_type=abstract

Astrophysical Journal v.419, p.286

Astronomy and Astrophysics

Astronomy

4

Infrared: Stars, Radiative Transfer, Stars: Chromospheres, Stars: Emission-Line, Be

Scientific paper

By means of a rigorous solution of the radiative transfer equation for a spherically symmetric medium, we studied the contribution of a stellar wind and a chromospheric structure to the IR continuum of Be stars. We made a detailed analysis of the different continuum opacity sources that contribute to the emergent flux. For different wavelengths (from UV to far-IR) we determined the continuum formation region, its inner and outer radii, and its relation to the chromospheric region. Since H free-free emission turns out to be the main emission mechanism, this model may explain the continuum spectrum of some Be stars, i.e., the stars classified in category F (according to Allen's 1973 classification).

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