Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-12-17
Astronomy and Astrophysics
Astrophysics
51 pages, LaTeX including three tables, requires 15 Encapsulated Postscript figures, to appear in ApJ
Scientific paper
10.1086/305792
We describe a non-LTE photoionization code to calculate the wind structure and emergent spectrum of a red giant wind illuminated by the hot component of a symbiotic binary system. We consider spherically symmetric winds with several different velocity and temperature laws and derive predicted line fluxes as a function of the red giant mass loss rate, \mdot. Our models generally match observations of the symbiotic stars EG And and AG Peg for \mdot about 10^{-8} \msunyr to 10^{-7} \msunyr. The optically thick cross- section of the red giant wind as viewed from the hot component is a crucial parameter in these models. Winds with cross-sections of 2--3 red giant radii reproduce the observed fluxes, because the wind density is then high, about 10^9 cm^{-3}. Our models favor winds with acceleration regions that either lie far from the red giant photosphere or extend for 2--3 red giant radii.
Kenyon Scott. J.
Proga Daniel
Raymond John C.
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