Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...622l.125i&link_type=abstract
The Astrophysical Journal, Volume 622, Issue 2, pp. L125-L128.
Astronomy and Astrophysics
Astronomy
22
Masers, Stars: Agb And Post-Agb, Stars: Mass Loss, Stars: Individual: Alphanumeric: W43A, Stars: Winds, Outflows
Scientific paper
We report Very Long Baseline Array and Very Large Array observations of 22 GHz H2O and 43 GHz SiO (v=1, J=1-0) maser emission as well as 7 mm continuum emission in W43A, which exhibits a highly collimated jet of molecular gas and a spherically expanding envelope very similar to that of an OH/IR star. The spatiokinematical structure of the H2O masers is well fitted to a precessing jet model with an expansion velocity of 150 km s-1 and a dynamical age of ~50 yr. The spatiokinematical structure of the SiO masers is well fitted to a biconically expanding flow model, whose axis is parallel to the direction of the collimated jet. Astrometry of the H2O and SiO masers suggests that these maser sources have a common dynamical center, possibly as part of a binary system, within 70 AU. The SiO masers may be excited on the surface of the cone that has significant deceleration and interacts with the jet. A 7 mm continuum emission source is located ~1300 AU away from these maser sources at a position angle of about -60° from the jet axis. The physical relation of the continuum to the maser sources is still unclear.
Deguchi Shuji
Diamond Philip J.
Imai Hiroshi
Miyazaki Atsushi
Nakashima Jun-ichi
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