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Astron. Astrophys. 318, 561-564 (1997)

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4. Conclusion

We have presented narrow-band imaging for Wei 1-5 and the newly discovered KeWe 1 confirming their nature as PNe. Both objects are morphologically similar at first sight, but a detailed inspection reveals that they are decidedly different or at least in different stages of their evolution. Wei 1-5 can be described in terms of a torus seen edge-on with a ratio of radius to thickness of 2. KeWe 1 is a more complicated case. Its central region seems to be devoid of emitting gas and a complete torus is not compatible with observations. We propose an incomplete torus and a broken shell both under destruction by a strong wind of the central star. A variety of shapes has been identified that can be interpreted as the result of erosion by this wind. KeWe 1 seems to be a rapidly evolving object, perhaps developing into a butterfly nebula, like K 1-10 or NGC 2899.

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998