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Maser kinematics and infrared properties of the water fountain IRAS 18286–0959

Published online by Cambridge University Press:  30 August 2012

Bosco H. K. Yung ,
Jun-ichi Nakashima ,
Hiroshi Imai ,
Shuji Deguchi ,
Philip J. Diamond  and
Sun Kwok
Bosco H. K. Yung
Affiliation:
Department of Physics, The University of Hong Kong, Pokfulam Rd, Hong Kong, ChinaB. H. K. Yung's email: byung@hku.hk
Jun-ichi Nakashima
Affiliation:
Department of Physics, The University of Hong Kong, Pokfulam Rd, Hong Kong, ChinaB. H. K. Yung's email: byung@hku.hk
Hiroshi Imai
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
Shuji Deguchi
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305, Japan
Philip J. Diamond
Affiliation:
Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester, Manchester M13 9PL, UK CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia
Sun Kwok
Affiliation:
Department of Physics, The University of Hong Kong, Pokfulam Rd, Hong Kong, ChinaB. H. K. Yung's email: byung@hku.hk
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Abstract

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A “water fountain” is a transitional object between an AGB star and a PN. The VLBA observations of 22.2 GHz water maser emission reveal a “double-helix” outflow pattern from one of the water fountains, IRAS 18286–0959. The pattern is reasonably fit by a model consisting of two precessing jets. We propose that the two jets observed are a result of a single driving source with a significant proper motion. Using data from the AKARI catalogs, we also found that water fountains might have their own IR colors which are affected by the 9.7 μm silicate feature and the optical thickness of stellar envelopes. The colors could serve as new criteria for searching this type of rare objects.

Keywords

Circumstellar matterstars: AGB and post-AGBstars: individual (IRAS)stars: windsoutflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 524 - 525
Copyright
Copyright © International Astronomical Union 2012

References

Kwok, S. 2010, PASA, 27, 174 CrossRefGoogle Scholar
Sahai, R. & Trauger, J. T. 1998, AJ, 116, 1357 CrossRefGoogle Scholar
Yung, B. H. K., Nakashima, J., Imai, H., Deguchi, S., Diamond, P. J., & Kwok, S. 2011, ApJ, 741, 94 Google Scholar