Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..630a&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 630-643. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
52
Emission Spectra, Ionization Potentials, Line Spectra, Stellar Spectra, Ultraviolet Spectra, Variable Stars, Density Measurement, Electron Density (Concentration), Helium, Iron, Iue, Magnesium, Nitrogen, Oxygen, Photometry, Resonance Lines, Stellar Luminosity
Scientific paper
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.
Altamore Aldo
Baratta Giovanni Battista
Cassatella Angelo
Friedjung Michael
Giangrande A.
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