THE AGES OF THE STARS THAT ILLUMINATE THE COMETARY NEBULAE
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UNAM, Observatorio Astronómico Nacional, CD MEXICO, DF, MEX
Abstract
Conical nebulae are regions of high density, and the most favorable ones for the formation of stars are the most pointed conical nebulae. Hence there are good reasons to consider cometary nebulae as an advanced stage of development of some of teh pointed