Ionization and its Structural Impacts on the Evolution of Planetary Nebulae

Details Ionization and its Structural Impacts on the Evolution of Planetary Nebulae Ionization and its Structural Impacts on the Evolution of Planetary Nebulae

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..313..283s&link_type=abstract

Asymmetrical Planetary Nebulae III: Winds, Structure and the Thunderbird, Proceedings of the conference held 28 July - 1 August

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We review our present knowledge about the formation and evolution of planetary nebulae and evaluate the relative importance of photoionization and wind interaction. It turns out that heating by photoionization drives the expansion of a planetary nebula during its entire life, while wind interaction accelerates and shapes the inner regions only during the later stages of evolution. We found observational evidence that the transition from spherical AGB-wind structures to more aspherical ones must occur when the star begins to evolve slowly off the AGB.

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