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We present infrared photometric observations of the Be binary system deltaScorpii obtained in 2006. The J,H and K magnitudes are the same within theerrors compared to observations taken 10 months earlier. We derive the infraredexcess from the observation and compare this to the color excess predicted by aradiative equilibrium model of the primary star and its circumstellar disk. Weuse a non-LTE computational code to model the gaseous envelope concentrated inthe star's equatorial plane and calculate the expected spectral energydistribution and Halpha emission profile of the star with its circumstellardisk. Using the observed infrared excess of delta Sco, as well as Halphaspectroscopy bracketing the IR observations in time, we place constraints onthe radial density distribution in the circumstellar disk. Because the diskexhibits variability in its density distribution, this work will be helpful inunderstanding its dynamics.

Infrared Excess in the Be Star Delta Scorpii