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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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