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 ∼ 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 ≲8500K. These parameters suggest that the nebula is the normal and possibly evolved Hii region of ζ Pup and γ2 Vel, rather than the fossil Stromgren sphere of the Vela supernova as suggested by Brandtet al. (1971).
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