Small Magellanic Cloud Be stars: colour-magnitude relations and mass-loss
W. J. de Wit, H. J. G. L. M. Lamers, J. B. Marquette, J. P. Beaulieu
Abstract
We present an analysis of optical lightcurves of Small Magellanic Cloud Be-type stars. Observations show that (1) optical excess flux is correlated with near-IR excess flux indicating a similar mechanism and (2) the lightcurves can trace out ``loops'' in a colour-magnitude diagram. A simple model for the time dependent bound-free and free-free emission produced by an outflowing circumstellar disk gives reasonable fits to the observations.
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