Abstract
ABSTRACT The H-alpha and H-beta emission lines of Nova V1500 Cyg between September 10-15, 1975, appear to show the light echo effect caused by reflection of a varying central source from a surrounding partial shell. Predictions based on a sinusoidally varying searchlight of 0.141-day period illuminating an expanding ring fit most of the observed variations quite well. The profiles indicate a clumpiness in the shell density which has also been noted by others. The H-alpha profile sharpened significantly between September 10 and October 7, 1975. Balmer line self-absorption, as proposed by Ferland (1978), can account for the large Balmer decrement observed and its velocity dependence. The latter increases inversely as the slope of the emission-line profiles and is more compatible with an emitting region in the form of an equatorial ring and polar 'blobs' rather than with a shell.
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