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Proper Motion of Water Masers Associated with IRAS 21391+5802: Bipolar Outflow and an AU‐Scale Dusty Circumstellar Shell
We present Very Long Baseline Array (VLBA) observations of water maser emission associated with the star-forming region IRAS 21391+5802, which is embedded in a bright-rimmed cometary globule in IC 1396. The angular resolution of the maps is ~0.8 mas, corresponding to a spatial resolution of ~0.6 AU at an estimated …