Journal Article

Discovery of multiple shells around the planetary nebula IC 418

G. Ramos-Larios, R. Vázquez, M. A. Guerrero, L. Olguín, R. A. Marquez-Lugo and H. Bravo-Alfaro

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 4, pages 3753-3760
Published in print July 2012 | ISSN: 0035-8711
Published online July 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21165.x
Discovery of multiple shells around the planetary nebula IC 418

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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 arcsec and , respectively. The main nebula is slightly off-centred 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.

Keywords: ISM: jets and outflows; ISM: lines and bands; planetary nebulae: individual: IC 418; infrared: ISM

Journal Article.  5602 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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