The Structure and Evolution of planetary Nebulae II

Details The Structure and Evolution of planetary Nebulae II The Structure and Evolution of planetary Nebulae II

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.9701c&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #97.01; Bulletin of the American Astronomical Society, Vol. 28, p.1401

Astronomy and Astrophysics

Astronomy

Scientific paper

HST images of planetary nebulae have sparked a closer look into their detailed structures. In this paper we review the Kwok, Purton, and Fitzgerald concept of the origin of Planetary nebulae which features a relatively dense shell of gas formed by a fast wind from the remnant core of a red giant colliding with a slow wind previously ejected from the red giant. Radiation from the remnant core ionizes the shell in this picture thus producing the planetary nebulae. Here we set criteria for the importance of the fast wind ram pressure in defining the structure of planetary nebulae. In addition we compare the relative importance of non-linear instabilities in uniformingly moving shells to Rayleigh- Taylor type instabilities in accelerating shells.

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