NGC 2359, NGC 6888, and Wolf-Rayet Stars.

Abstract

Radio observations give the fluxes of the two shell nebulae, and, for NGC 2359, the radio spectrum, which is flat, or thermal The shells appear to surround Wolf-Rayet stars whose distances can be estimated. Various optical data are combined with the radio data to model NGC 6888 as a shell formed by ejection of matter from the star against the interstellar gas, and to suggest the same occurrence in NGC 2359.