The Motion of Water Masers in the Pre-Planetary Nebula IRAS 16342-3814

Abstract

We present high angular resolution observations, using the Very Long Baseline Array (VLBA) of the NRAO, of the high-velocity water masers toward the "water-fountain" pre-planetary nebula, IRAS 16342-3814. The detailed structure of the water masers appears to be that of bow shocks on either side of a highly collimated jet. The proper motions of the water masers are approximately equal to the radial velocities; the three-dimensional velocities are approximately +/-180 km/s, which leads to a very short dynamical time-scale of ~100 years. Although we do not find direct evidence for precession of the fast collimated jet, there may be indirect evidence for such precession.

arXiv commentAccepted by the Astrophysical Journal

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• IRAS 18113-2503: the water fountain with the fastest jet?
• Proper Motions of H2O Masers in the Water Fountain Source IRAS 19190+1102
• Measurement of the Distance and Proper Motions of the H2O Masers in the Young Planetary Nebula K 3-35
• Water Maser Survey on AKARI and IRAS Sources: A Search for "Low-Velocity" Water Fountains
• Spatio-kinematical model of the collimated molecular outflow in the water-fountain nebula IRAS 16342-3814
• Annual Parallax Distance and Secular Motion of the Water Fountain Source IRAS 18286-0959
• The spatiokinematical structure of H_2O and OH masers in the "water fountain" source IRAS 18460-0151
• Interferometric confirmation of "water fountain" candidates
• CO J=3-2 Emission from the "Water Fountain" Sources IRAS 16342-3814 and IRAS 18286-0959
• Extremely Strong ^{13}CO J=3-2 Line in the "Water Fountain" IRAS 16342-3814: Evidence for the Hot-Bottom Burning
• FLASHING: New high-velocity H${}_2$O masers in IRAS 18286$-$0959
• Dust shell model of the water fountain source IRAS 16342--3814
• A Fast bipolar H2 outflow from IRAS 16342-3814: an old star reliving its youth
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