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astro-ph2008★ 19 cited
The Unusual Distributions of Ionized Material and Molecular Hydrogen in NGC 6881: Signposts of Multiple Events of Bipolar Ejection in a Planetary Nebula
G. Ramos-Larios, M. A. Guerrero, L. F. Miranda
The planetary nebula NGC 6881 displays in the optical a quadrupolar morphology consisting of two pairs of highly collimated bipolar lobes aligned along different directions. An add…
astro-ph2007
The H2 Amazing Life of NGC 6881
G. Ramos-Larios, M. A. Guerrero, L. F. Miranda
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…