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We analyze the V-band photometry data of the Be star omega CMa, observedduring the last four decades. The data is fitted by hydrodynamic models basedon the viscous decretion disk (VDD) theory, in which a disk around afast-spinning Be star is formed by material ejected by the central star anddriven to progressively wider orbits by means of viscous torques. For the firsttime, we apply the model for both the disk build up and the dissipation phases.Our simulations offer a good description of the photometric variability in bothphases, which suggests that the VDD model adequately describes the diskstructural evolution. Furthermore, our analysis allowed us to determine theviscosity parameter (alpha) of the gas, as well as the net mass loss rate. Wefind that alpha is variable, ranging from 0.1 to 1.0, and that build up phaseshave larger values of alpha than the dissipation phases. Additionally, we findthat, contrary to what is generally assumed, even during quiescence the outwardmass flux is never zero, suggesting that the star alternates between a highmass-loss phase (outburst) and a low mass-loss phase (quiescence).

An analysis of the V-band light curve of the Be star omega CMa with the viscous decretion disk model