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Ionization models of symbiotic stars

Published online by Cambridge University Press:  12 April 2016

H. Nussbaumer
H. Nussbaumer*
Affiliation:
Institute of Astronomy ETH Zentrum8092 Zürich (Switzerland)

Summary

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A model of a symbiotic system is outlined. We present evidence that the main ionization mechanism responsible for the symbiotic nebula is radiative and not collisional. For calculating fractional ionization throughout the emission region we take either a blackbody source or an accreting system. If the ionizing radiation is due to accretion, the boundary layer between accreting star and disc provides the bulk of the ionizing photons. The possibility for distinguishing between different ionization sources are briefly discussed. C/N and O/N abundance ratios, calculated with the outlined ionization model places HM Sge, RS Oph, and T CrB among the novae and not among the symbiotic stars.

Type
Session 2. The Physics of the Symbiotic Phenomenon
Information
International Astronomical Union Colloquium , Volume 103: The Symbiotic Phenomenon , 1988 , pp. 107 - 118
Copyright
Copyright © Kluwer 1988

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