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Water Fountains in Pre-Planetary Nebulae: The Case of IRAS16342–3814

Published online by Cambridge University Press:  24 July 2012

Mark Claussen ,
Raghvendra Sahai ,
Mark Morris  and
Hannah Rogers
Mark Claussen
Affiliation:
National Radio Astronomy Observatory, P.O. Box O, 1003 Lopezville Rd., Socorro, NM 87801
Raghvendra Sahai
Affiliation:
Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109
Mark Morris
Affiliation:
University of California, Los Angeles, CA 90095
Hannah Rogers
Affiliation:
National Radio Astronomy Observatory, P.O. Box O, 1003 Lopezville Rd., Socorro, NM 87801 Augustana College, 2001 S. Summit Ave, Sioux Falls, SD 57197
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Abstract

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We present a brief review of Very Long Baseline Array (VLBA) observations of water masers in the so-called water fountain pre-planetary nebulae, and report on new VLBA and Very Large Array (VLA) data for the water masers in the prototypical water fountain source IRAS16342–3814, taken approximately monthly in 2008–2009. A new and very strong water maser is found at an LSR velocity of −3 km s−1, which is offset from the central (likely stellar) velocity. The new VLBA observations still show a similar general structure as was observed in 2002, but there are details which are difficult to explain.

Keywords

Stars: AGB and post-AGB — Masers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 225 - 229
Copyright
Copyright © International Astronomical Union 2012

References

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