Abstract
The interacting winds model has been used to explain many observational phenomena of symbiotic systems and planetary nebulae successfully. New observational results on seven symbiotic systems, obtained by the ultraviolet spectrometer (UVS) on board of spacecrafts Voyager 1 and Voyager 2, provide strong new evidence supporting the interacting winds model. Three of the systems observed by the Voyager UVS show strong O VI λ1035 and other far-ultraviolet (FUV) lines, including N V λ1240. A one-dimensional photoionization program, CLOUDY, is used to calculate the luminosities of FUV lines to compare with the observational results from the Voyager UVS. The calculations show that, based on a photoionization model, a thin dense shell is necessary to produce the observed lines. The density, radius, and thickness of the shell is consistent with that predicted by the interacting winds model. A model spectrum is produced that is well matched with the Voyager UVS spectrum. The calculations also explain why some of the symbiotic systems have O VI λ1035 but others do not, based on the interacting winds model.
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