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R. L. Riddle, W. G. Bagnuolo (Department of Physics and Astronomy, Georgia State University)
Studies of the massive O-binary 29 UW CMa are presented, which show a variation in the spectrum of the secondary at different phases of the orbit. The variations of the secondary spectrum are much weaker during the receding phases than the approaching ones, a demonstration of the "Struve-Sahade Effect." Previously, we examined IUE ultraviolet spectra, which suggested that the differences in phase are caused by a wind obscuration effect instead of a heating enhancement. In addition, a feature in the cross correlation function (CCF) at 0.2 phase appeared to be caused by a directed wind passing close to the secondary, evidenced by a blue shift in the spectrum. We have used the Geogia State University Multiple Telescope Telescope (MTT) to gather observations in a number of visual bands and present the results of the test of this hypothesis.
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The author(s) of this abstract have provided an email address for comments about the abstract: riddle@chara.gsu.edu