Symmetry and Asymmetry in "born again" Planetary Nebulae

Details Symmetry and Asymmetry in "born again" Planetary Nebulae Symmetry and Asymmetry in "born again" Planetary Nebulae

2008-04-25

arxiv.org/abs/0804.4058v1

Astronomy and Astrophysics

Astrophysics

will appear in the proceedings of "Asymmetrical Planetary Nebulae IV", Eds.: Romano L.M. Corradi, Arturo Manchado and Noam Sok

Scientific paper

While in the past spheroidicity was assumed, and still is used in modeling of most nebulae, we know now that only a small number of planetary nebulae (PNe) are really spherical or at least nearly round. Round planetary nebulae are the minority of objects. In case of those objects that underwent a very late helium flash (called VLTP or "born-again" PNe) it seems to be different. The first, hydrogen rich PN, is more or less round. The ejecta from the VLTP event is extremely asymmetrically. Angular momentum is mostly assumed to be the main reason for the asymmetry in PNe. Thus we have to find processes either changing their behavior within a few hundred to a few thousands of years or change their properties dramatically due to the variation of the abundance. They most likely have a strong link or dependency with the abundance of the ejecta.

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