Ultraviolet and coordinated ground-based observations of Z Andromedae

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Abstract
High- and low-resolution UV spectrograms of the symbiotic star Z Andromedae were made during 1978-79 with the International Ultraviolet Explorer (IUE) and coordinated with ground-based observations. The spectrograms extend from 1200 to 3341 A and show a rich emission line spectrum with a wide range of ionization energy, from O I, Mg I and II and Fe II to He II, N V, O V, and Mg V. From the analysis of the emission lines, an electron density of 2 x 10 to the 10th/cu cm is derived, along with an emitting volume of 1 x 10 to the 37th/cu cm and a maximum line-of-sight thickness of 6 x 10 to the 10th cm. It is argued that the high-ionization emission lines are formed in a region which is not nebular, but in a solar-type transition zone around the cool star

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