Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..301h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 301-313.
Astronomy and Astrophysics
Astrophysics
15
Accretion Disks, Dynamic Models, Nebulae, Stellar Models, Symbiotic Stars, Density Distribution, Equations Of Motion, Stellar Envelopes, Stellar Winds
Scientific paper
The symbiotic star R Aquarii is surrounded by a complex extended emission nebulosity. We model the lenticular outer nebula as the interaction of a fast wind from an accretion disk with inhomogeneously distributed ambient gas. The ambient gas is swept up into a thin shell which becomes elongated in the direction of the steepest density gradient. We investigate a variety of ambient density distributions and we show that the gross morphology, kinematics and optical appearance of the nebula can be reproduced by such a model under the assumption that the emission is produced by optically thin shock-heated gas. In the best-fit model, the ambient gas has a number density of 10/cu cm in the orbital plane of the system and falls off exponentially above and below this plane. We deduce the mass loss rate of the fast wind to be of order 10 exp -10 solar mass/yr for an assumed fast wind velocity of 1000 km/s, and we show this to be broadly consistent with observations.
Dyson John E.
Henney William J.
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