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The H and He emission lines of the microquasar SS 433 contain features thatlook very like emission from a circumbinary ring. Phenomenological models havebeen successful but contain certain ad hoc features. In this note the lines aretreated as recombination lines from a highly ionized environment anddifferences between H and He, previously unexplained, are understood in termsof the different ionization potentials. It now seems inconceivable that thesespectral features have origin other than in a circumbinary ring orbiting atapproximately 250 km/s - in which case the system mass is approximately 40solar masses.

Yet more on the circumbinary disk of SS 433