Abstract
Abstract We present the results of observations of the M-type semiregular supergiant VX Sgr in the water-vapour line at λ = 1.35 cm. The observations were carried out on the 22-metre radio telescope RT-22 in Pushchino in 1981–1996. The profiles of the H2O line have a complex structure typical for H2O masers associated with late-type supergiants. We reveal some features persistent during the last 15 years; we suggest that they arise from masering H2O molecules located in the circumstellar disk and the bipolar outflows from the disk poles. The parameters of the outflow are estimated.
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