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LBL-7227 With some simple modifications, the image-tube scanner at the 3 m telescope at Lick Observatory can be used in a high time-resolution mode. We have employed this apparatus to study the spectral changes which occur during the pulse period in the optical pulsars HZ Herculis (1.2 s period) and DQ Herculis (71 s period). In this thesis we describe the data acquisition and develop the tools needed for the data analysis. We then present the results of the observations. In the case of HZ Herculis (Hercules X-1), our observatiqns cover the binary phase interval 0.18 to 0.26 and are concerned only with those pulsations that have been shown (Middleditch and Nelson, 1976) to originate at the X-ray heated surface of the Roche lobe filling companion of the neutron star. We find that these pulsations are distributed throughout the optical continuum. Although the details of this distribution are not precisely determined, our observations appear to agree at least

Time-resolved spectrophotometry of HZ Herculis and DQ Herculis