Multipolar Bubbles and Jets in Very Low Excitation Planetary Nebulae - A WFPC2 HAlpha imaging survey

Details Multipolar Bubbles and Jets in Very Low Excitation Planetary Nebulae - A WFPC2 HAlpha imaging survey Multipolar Bubbles and Jets in Very Low Excitation Planetary Nebulae - A WFPC2 HAlpha imaging survey

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8345s&link_type=abstract

HST Proposal ID #8345

Physics

Hst Proposal Id #8345 Stellar Ejecta

Scientific paper

Planetary nebulae {PNe} show a dazzling variety of structures not apparent in the circumstellar envelopes of the AGB stars from which they evolve. The physical phenomena which shape the PNe occur early in their formation history, involving the hydrodynamic interaction of one or more fast winds with the slower AGB mass-outflow. However, since the youngest PNe, which retain the clearest visible signatures of these phenomena, are very compact {<5''}, ground-based observations provide very limited information on these objects. Our Cycle 6 H Alpha imaging survey of very young, low-excitation PNe showed that all 11 objects imaged have extreme aspherical structure {including multiple bubbles and jets with a large degree of point-symmetry}. These data, difficult to explain under the existing paradigm, have led to the hypothesis that fast collimated outflows with changing directionality are the primary agent for the formation and shaping of PNe. We therefore propose to image a statistical sample of such objects in order to test the new hypothesis. From our images, we will determine the angular sizes of different nebular components, which together with distances and expansion velocities, will allow detailed tests of evolutionary models. Comparison of the morphologies of our young PNe sample with more evolved PNe populations will set new constraints on models for the production of jet-like outflows and nebular evolution.

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