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| Paper: |
Concentric Semi-Circular Rings/Arcs |
| Volume: |
313, Asymmetrical Planetary Nebulae III |
| Page: |
247 |
| Authors: |
Su, K.Y.L. |
| Abstract: |
Concentric semi-circular arcs/rings have been seen in six PPNs, twelve PNs and one AGB star, which provides crucial insights into the AGB mass loss history and mechanism. Here I review the observational facts of the rings/arcs (summary properties in Table 1), and some models accounting for them. |
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