THE WIND OF EG ANDROMEDAE IS NOT DUST DRIVEN

The symbiotic star EG Andromedae has recently been the subject of seve ral studies investigating its wind properties. Late-type giants are us ually considered to have winds driven by radiation pressure on dust. I ndeed, the derived wind velocity for EG Andromedae is consistent with this model. We point out here that there is no appreciable dust opacit y in the wind of EG Andromedae using constraints on extinction limits from IUE and far infrared fluxes from IRAS. An alternate mechanism mus t operate in this star. We suggest that the wind can be driven by radi ation pressure on molecular lines.