VLBI Observations of Water Masers in the Circumstellar Envelope of IRC+60169

Water masers around an AGB star IRC+60169 have been observed at four epochs using the Japanese VLBI networks. The distribution of the red-shifted features exhibits a ring-like structure, the size of which is 30 mas and corresponds to the inner radius of the maser shell. This implies that dense gas around the star obscures red-shifted emission