Variations in the spectrum of 29 UW Canis Majoris

Details Variations in the spectrum of 29 UW Canis Majoris Variations in the spectrum of 29 UW Canis Majoris

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7605r&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #76.05; Bulletin of the American Astronomical Society, Vol. 31, p.1483

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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