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Published online by Cambridge University Press: 12 April 2016
Three observational studies of YY Ori, the apparently brightest of the YY Ori-type variables in the Orion nebula cluster (Walker 1972), have been carried out. These are:
1. A program of simultaneous spectroscopic and photometric observations. In this program, spectra were obtained on 14 nights at a dispersion of 115 A/mm using a Spectracon image converter mounted at the focus of the Bowen f/1 camera of the coudé spectrograph of the 120-inch reflector (Walker 1966, 1969a). The simultaneous photoelectric observations, on the U B V system, were obtained using the 24-inch Lick reflector.
2. In collaboration with D. Burstein, higher dispersion (0.625 A/channel) observations were obtained on two nights using the Robinson-Wampler scanner at the Cassegrain focus of the 120-inch reflector to investigate in greater detail the structure of the emission and inverse P Cyg absorption features in the spectrum.
3. Spectrophotometry observations were obtained using the instrumentation described in (1) above with a wide slit (4” in width) to investigate the form of the energy distribution in the region from 3200A - 5100A.