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| Paper: |
High Velocity Jets in Water Fountain Pre-Planetary Nebulae |
| Volume: |
313, Asymmetrical Planetary Nebulae III |
| Page: |
331 |
| Authors: |
Claussen, M.; Sahai, R.; Morris, M. |
| Abstract: |
We review the high angular resolution observations made using the Very Long Baseline Array (VLBA) of the NRAO of the high-velocity water masers toward two so-called "water-fountain" nebulae, W 43A and IRAS 16342−3814. The distribution and proper motions of the water masers toward W 43A suggest that the masers are in a highly collimated jet which is precessing. For IRAS 16342-3814 the detailed structure appears to be that of bow shocks on either side of a highly collimated jet; the proper motion of the water masers is approximately equal to the radial velocity and thus the three-dimensional velocities are approximately ±185 km s-1. The dynamical time scale for both sources is quite short; only about 150 – 200 years. |
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