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Full polarization VLBA maps of a proto-planetary nebula

Published online by Cambridge University Press:  01 March 2007

Kim McAlpine ,
A.J. Kemball  and
J. L. Jonas
Kim McAlpine
Affiliation:
Department of Physics and Electronics, Rhodes University, Grahamstown, 6139, South Africa
A.J. Kemball
Affiliation:
National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, 605 East Springfield Avenue, Champaign, IL 61820, USA
J. L. Jonas
Affiliation:
Department of Physics and Electronics, Rhodes University, Grahamstown, 6139, South Africa
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Abstract

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The morphological evolution of stars from the asymptotic giant branch (AGB) to the planetary nebula (PN) phases presents an intriguing problem in stellar research. Planetary nebulae show bright-rims, well-defined shell-like structures and a large proportion of them are axisymmetric. In contrast their progenitor AGB stars are largely spherically symmetric (Sahai, 2004). Studies of proto-planetary nebulae, which are objects in transition between these two phases of stellar evolution, offer insight into the mechanisms which are responsible for the onset of axisymmetry. This poster presents the first polarization VLBI observations of the 1612 MHz OH maser emission from the proto-planetary nebula candidate OH O.9+1.3. The morphology, kinematics and polarization properties of these masers are discussed.

Keywords

proto-planetary nebulaeOH masers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 324 - 325
Copyright
Copyright © International Astronomical Union 2008

References

Sahai, R. 2004, ASP CS 313, 141Google Scholar
García-Segura, G., López, J. A. & Franco, J. 2005 ApJ 618, 919CrossRefGoogle Scholar
Matt, S., Frank, A. & Blackman, E. G. 2004 ASP CS 313, 449Google Scholar