AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 50. High Angular Resolution Science with the NRAO Very Long Baseline Array
Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southwest Exhibit Hall

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[50.04] Observations of Water Masers Associated with the Proto-Planetary Nebula Candidate IRAS 19296+2227

K. B. Marvel (American Astronomical Society), D. A. Boboltz (United States Naval Obs.)

We present the first VLBI observations of the 616-523, 22-GHz H2O maser emission associated with a proto-planetary nebula candidate. Three epochs of observation of the water masers towards IRAS 19296+2227 were obtained with the Very Long Baseline Array operated by the National Radio Astronomy Observatory. These observations show that the water masers are distributed over a 40 milliarcsecond, arc-like structure covering a limited velocity range of ~4 km s-1. It is unclear whether the masers reside in a residual circumstellar shell or in a region shocked by a PN fast wind. Over the 40 days spanning Epochs 1 and 3, we have measured an average proper motion of 12.6 ±5.7 km s-1 indicating that the masers are probably not in a high velocity outflow.

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