Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5004m&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #50.04; Bulletin of the American Astronomical Society, Vol. 31, p.896
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the first VLBI observations of the 616-523, 22-GHz H_2O 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.
Boboltz David A.
Marvel Kevin B.
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