A Collimated Jet of Molecular Gas from the AGB Star W 43A

Details A Collimated Jet of Molecular Gas from the AGB Star W 43A A Collimated Jet of Molecular Gas from the AGB Star W 43A

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003rmxac..15...74i&link_type=abstract

Winds, Bubbles, and Explosions: a conference to honor John Dyson, Pátzcuaro, Michoacán, México, September 9-13, 2002 (Eds. S. J.

Astronomy and Astrophysics

Astronomy

3

Masers, Ism: Jets And Outflows, Stars: Agb And Post-Agb, Stars: Individual (W43A)

Scientific paper

We present the spatial and velocity distributions of H[2]O and OH masers in the OH/IR star W43A. These masers have the same systemic velocity and are, therefore, likely to be associated with the common stellar object. However, the OH masers exhibit clear arc-shaped structures and indicate a spherically-expanding shell, while most of the H[2]O masers are extremely collimated spatially and kinematically. The observed angular pattern of the H[2]O masers is well fit by a precessing jet model. We infer that an elongated planetary nebula is formed by such a ``molecular jet'' during the short period (< 1000years) of the transition through the proto-planetary nebula phase.

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