A physical model for the Gum Nebula is derived from dispersion measures of pulsars, the nebular Ha emission measure, rocket observations of the La absorption in the spectra of 2 Vel and Pup, and photometry of stars near 2 Vel. The objects 2 Vel and Pup are not capable of ionizing the nebula. We suggest that the nebula was produced by radiation from the supernova outburst that gave rise to the Vela X remnant and pulsar PSR 0833-45.
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Brandt et al. (1971) studied this question.