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arXiv · 1204.5816

Discovery of Multiple Shells Around the Planetary Nebula IC 418

Gerardo Ramos-Larios·Roberto Vazquez·Martin A. Guerrero·Lorenzo Olguin·R. A. Marquez-Lugo·Hector Bravo-Alfaro
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Abstract

We have analysed optical, near-, and mid-IR images of the bright planetary nebula (PN) IC 418. These images probe unambiguously for the first time a number of low surface brightness structures and shells around the bright main nebula, including radial filaments or rays, a system of three concentric rings, and two detached haloes with sizes ~ 150" and 220"\times250", respectively. The main nebula is slightly off-centered with respect to the elliptical outer halo. The time-lapse between the two haloes is 10,000-50,000 yr, whereas the time-lapse between the three concentric rings is ~ 630 yr. We emphasize the advantages of near- and mid-IR imaging for the detection of faint structures and shells around optically bright nebulae.

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Gerardo Ramos-Larios, Roberto Vazquez, Martin A. Guerrero, Lorenzo Olguin, R. A. Marquez-Lugo, Hector Bravo-Alfaro. 2012-04-26. Discovery of Multiple Shells Around the Planetary Nebula IC 418. https://doi.org/10.1111/j.1365-2966.2012.21165.x

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