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A reexamination of the Gum nebula
Authors:Klaus P Beuermann
Institution:(1) Institut für Reine und Angewandte Kernphysik, Universität Kiel, Germany
Abstract:A detailed analysis of interstellar measurements in the direction of the Gum nebula is carried out. The ionized region is shown to have an angular radius of sim 18° and appears to be bounded by a shell of neutral gas. The mean electron temperature deduced from radio-frequency absorption measurements is found to be lap8500K. These parameters suggest that the nebula is the normal and possibly evolved Hii region of zeta Pup and gamma2 Vel, rather than the fossil Strömgren sphere of the Vela supernova as suggested by Brandtet al. (1971).
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