Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934824r&link_type=abstract
American Astronomical Society, AAS Meeting #219, #348.24
Astronomy and Astrophysics
Astronomy
Scientific paper
The water fountain pre-planetary nebula IRAS 16342-3814 was observed approximately monthly over a period of a year with the Very Large Array (VLA) and the Very Long Baseline Array (VLBA) of the National Radio Astronomy Observatory. The new observations, from 2008, were compared to observations from the VLA and VLBA in 2002 and observations using the NRAO 140-foot telescope in 1992. The spectra of the water masers within the pre-planetary nebula show a new and very strong maser around -3 km/s, and previously observed slightly blue shifted water masers are no longer visible. The velocity spread covered by the water masers has increased from 260.4 km/s to 307.9 km/s between 1992 and 2008. There was a slight decrease in the velocity spread of 2002 to 244.7 km/s. Unlike past observations of this pre-planetary nebula, the water masers do not show symmetry about a central systemic velocity. The length of the line (projected on the sky) joining the extreme blue- and red- shifted water masers also appears to have stopped growing at a length of 3104.0±0.2 mas, even though the increased range in the line of sight velocities suggests that the water masers are moving outwards faster than before. Ideas which may turn into models are currently being developed to explain this phenomenon.
The NRAO is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc. Part of this research was carried out under the auspices of the National Science Foundation's Research Experience for Undergraduates (REU) program at the NRAO, and we gratefully acknowledge the funding for this program.
Claussen Mark
Morris Mark R.
Rogers Hannah
Sahai Raghvendra
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