Symmetry and Asymmetry in "born again" Planetary Nebulae

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dc.creatorKimeswenger, S.
dc.creatorZijlstra, A. A.
dc.creatorvan Hoof, P. A. M.
dc.creatorHajduk, M.
dc.creatorLechner, M. F. M.
dc.creatorVan de Steene, G. C.
dc.creatorGesicki, K.
dc.date2008-04-25
dc.date.accessioned2026-07-07T09:35:17Z
dc.date.available2026-07-07T09:35:17Z
dc.descriptionWhile 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.
dc.descriptionwill appear in the proceedings of "Asymmetrical Planetary Nebulae IV", Eds.: Romano L.M. Corradi, Arturo Manchado and Noam Soker
dc.identifierhttps://arxiv.org/abs/0804.4058
dc.identifierhttp://arxiv.org/abs/0804.4058
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159782
dc.subjectAstrophysics
dc.titleSymmetry and Asymmetry in "born again" Planetary Nebulae
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