The H2 Amazing Life of NGC 6881
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The H2 and optical (Ha, [NII]) morphology of NGC 6881 are very different. Here we present a preliminary report of the analysis of new optical (Ha and [NII]) and near-IR (Brg and H2) images and intermediate resolution JHK spectra of this nebula. Our observations confirm the association of the H2 bipolar lobes to NGC 6881 and reveal that H2 is predominantly shock excited in this nebula. We conclude that NGC 6881 has multiple bipolar lobes that formed at different phases of the nebular evolution and that the collimation conditions or even the collimating agent changed from one ejection to the other.
5 pages, proceedings of the conference Asymmetrical Planetary Nebulae IV La Palma, June 18-22 2007
5 pages, proceedings of the conference Asymmetrical Planetary Nebulae IV La Palma, June 18-22 2007