Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..215i&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
Astronomy and Astrophysics
Astronomy
Scientific paper
We present VLBA observations of the spatial and velocity distributions of 22-GHz h2o and 1612-MHz OH masers in the OH/IR star W43A. These masers have the same systemic velocity (vlsr ≍ 34 kms) and are, therefore, likely to be associated with a common stellar object. However, their kinematical structures are quite different and independent. Most of the h2o masers are extremely collimated spatially and kinematically. The W43A jet is very likely to be predominantly composed of hot molecules traced by h2o maser emission and formed in the immediate vicinity of the stellar object. The observed angular pattern of the h2o masers is well fit by a precessing jet model. In contrast, the OH masers exhibit clear arc-shaped structures indicating a spherically-expanding shell. Taking into account the detection of SiO masers and the periodic intensity variation of the OH masers in W43A, we infer that elongated planetary nebulae are formed by such a "molecular jet" during the short period (< 1000 years) of the transition through the proto-planetary nebula phase.
Diamond Phil J.
Imai Hiroshi
Obara Kazushige
Omodaka Toshihiro
Sasao Tetsuo
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