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Spectroscopic and Photometric Observations of YY Orionis

Published online by Cambridge University Press:  12 April 2016

Merle F. Walker
Merle F. Walker*
Affiliation:
Lick Observatory, University of California, Santa Cruz, Santa Cruz, California, 95064, U. S. A.

Extract

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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. 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. 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. 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.

Type
Part I: Young Objects
Information
International Astronomical Union Colloquium , Volume 42: The Interaction of Variable Stars with their Environment , 1977 , pp. 92 - 99
Copyright
Copyright © Veröff. Der Remeis-Sterwarte 1977

References

Walker, M. F. 1966, Adv. in Electronics, 22B, 761.Google Scholar
Walker, M. F. 1969a, Adv. in Electronics, 288, 773.Google Scholar
Walker, M. F. 1969b, Non-periodic Phenomena in Variable Stars, ed. Detre, L. (Budapest: Academic Press), p. 103.Google Scholar
Walker, M. F. 1972, Ap. J., 175, 89.Google Scholar