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Small magellanic cloud be stars: color-magnitude relations and mass-loss

By W.J.M. de Wit, H.J.G.L.M. Lamers, J.B. Marquette and J.P. Beaulieu


We present an analysis of optical lightcurves of Small Magellanic Cloud (SMC) 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 dependence of bound-free and free-free (bf-ff) emission produced by an outflowing circumstellar disk gives reasonable fits to the observations

Year: 2008
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