Paper:	Proper Motions of Water Masers in Circumstellar Shells
Volume:	144, Radio Emission from Galactic and Extragalactic Compact Sources, IAU Colloquium 164
Page:	253
Authors:	Marvel, K. B.; Diamond, P. J.; Kemball, A. J.
Abstract:	We present measurements of proper motions for circumstellar water maser observations obtained with the VLBA. Results of the observations and modeling indicate that the water masers exist in a kinematically complex region of the circumstellar envelope. A change in position of the maser spots as a function of velocity is discussed.

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