Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118.1791m&link_type=abstract
The Astronomical Journal, Volume 118, Issue 4, pp. 1791-1797.
Astronomy and Astrophysics
Astronomy
8
Stars: Circumstellar Matter, Stars: Agb And Post-Agb, Stars: Winds, Outflows
Scientific paper
We present the first very long baseline interferometric observations of the 6_16-5_23, 22 GHz H_2O maser emission associated with a proto-planetary nebula candidate. We obtained three epochs of observation of the water masers associated with IRAS 19296+2227, using the Very Long Baseline Array, operated by the National Radio Astronomy Observatory. These observations show that the water masers are distributed over a 50 mas arclike structure covering a limited velocity range of ~9 km s^-1. The masers most likely reside in an asymptotic giant branch-like circumstellar shell, although we cannot rule out the possibility that they lie in a shocked region. Over the 40 days spanning the epochs of observation, we have measured an error-weighted average proper motion of 6.16+/-1.32 km s^-1, indicating that the masers are not in a high-velocity outflow.
Boboltz David A.
Marvel Kevin B.
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