Department, Whitin Observatory, Wellesley College, Wellesley, MA 02181
We have been
monitoring the water maser emission from the circumstellar shells of 11
variable stars and comparing the variation in maser emission to the visible
light curves. Two of these stars (V778 Cyg and EU And) in which we have
detected maser emissions are carbon stars which are not expected to have water
in their circumstellar material. We encourage AAVSO observers to observe these
unusual carbon stars.