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Multipolar planetary nebulae: Not as geometrically diversified as thought

Published online by Cambridge University Press:  30 August 2012

Sze-Ning Chong ,
Sun Kwok ,
Hiroshi Imai  and
Daniel Tafoya
Sze-Ning Chong
Affiliation:
1Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan email: selina@milkyway.sci.kagoshima-u.ac.jp
Sun Kwok
Affiliation:
Department of Physics, The University of Hong KongPokfulam Road, Hong Kong email: sunkwok@hku.hk
Hiroshi Imai
Affiliation:
1Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan email: selina@milkyway.sci.kagoshima-u.ac.jp
Daniel Tafoya
Affiliation:
1Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan email: selina@milkyway.sci.kagoshima-u.ac.jp
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Abstract

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We present a general three-dimensional model of multipolar planetary nebulae (PNe). By rotating to different viewing angles and adjusting the angles between the multiple lobes, we demonstrate that the model is able to reproduce HST Hα images of 20 multipolar young PNe. Though this model only considers the geometrical projection effects, it significantly unifies the selected PNe and can be considered as a first-order fundamental model of the “multipolar” morphological class. This kind of model reduces complexity and is essential to pursuing of the shaping mechanism. In addition, we illustrate that under some special conditions, i.e. in certain viewing angles, or with low sensitivity, it will be hard to imagine that the projected image originates from a multipolar-lobed model.

Keywords

planetary nebulae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 184 - 187
Copyright
Copyright © International Astronomical Union 2012

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