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Published online by Cambridge University Press: 04 August 2017
RX Puppis is a southern symbiotic star (R.A. 08h12m 28s.2, Dec. −41°33'18“ B1950). For almost a century it has been seen to have had a violent history at optical wavelengths. In 1974 it was discovered, at 5 GHz, to be a weak radio source. Shortly after, its radio spectrum was found to be of the optically thin type, having approximately the same flux density at all frequencies between 2.7 and 22 GHz. This implied that the RX Puppis system contained dispersed, ionized gas having a linear size >1015 cm.