Abstract
The non-spherical distribution of ejected matter in the nebular stages of novae is discussed in terms of the assumed binary nature of the central stars. An hypothesis is proposed, by which the non-spherical distribution may be formed, and which may explain most of the general features of the nova phenomenon. The nature of line profiles formed by non-spherical ejecta is discussed and illustrated. New spectrophotometric observations are presented of the later stages of three recent novae, and models are derived for their postmaximum and nebular stages, in terms of the foregoing discussion.

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