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Paper: The Born-again Planetary Nebulae Abell 30 and Abell 78
Volume: 493, 19th European Workshop on White Dwarfs
Page: 141
Authors: Todt, H.; Guerrero, M. A.; Fang, X.; Toalá, J. A.; Arthur, J. S.; Blair, W. P.; Chu, Y.-H.; Gruendl, R. A.; Hamann, W.-R.; Márquez-Lugo, R. A.; Oskinova, L.; Ruiz, N.; Steffen, M.; Schönberner, D.
Abstract: The planetary nebulae Abell 30 and Abell 78 are born-again nebulae, which are believed to have undergone a very late thermal pulse, resulting in the ejection of hydrogen-poor material. Born-again PNe are a rare phenomenon, only a few are known. It is really intriguing that in all cases the expansion of the hydrogen-poor ejecta is highly asymmetrical. Here we present new HST observations of the expansion of the ejecta in Abell 30 and Abell 78, and compare them to ≈20 yrs older HST images.
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