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Paper: Morphologies of the Nebulae around “Born-Again” Central Stars of Planetary Nebulae
Volume: 391, Hydrogen-Deficient Stars
Page: 177
Authors: Kimeswenger, S.; Zijlstra, A.A.; van Hoof, P.A.M.; Hajduk, M.; Herwig, F.; Lechner, M.F.M.; Eyres, S.P.S.; Van de Steene G.C.
Abstract: While in the past spherodicity 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 the case of those objects that underwent a very late helium flash (called VLTP objects 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, in contrast, are extremely asymmetrical.
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