Journal Article

The visual and mid-infrared properties of the bipolar planetary nebula NGC 650-1

G. Ramos-Larios, J. P. Phillips and L. Cuesta

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 1, pages 52-62
Published in print November 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13886.x
The visual and mid-infrared properties of the bipolar planetary nebula NGC 650-1

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The bipolar planetary nebula NGC 650-1 has been imaged in Hα, Hβ, [N ii]λ6583 Å and [S ii]λλ6717+6731 Å. These results are used to map the variation of extinction over the interior regions of the shell, where we find evidence for a gradual increase in AV between the SW and NE limits of the central emission bar. It is argued that this is likely to arise from dust associated with the nebular envelope itself. We have also produced a map of electron densities over this region, and find evidence for marked variations in ne over a scale of ∼5 arcsec, a variation which is probably related to the clumpy emission structure observed in low-excitation images. We finally present contour mapping of mid-infrared Spitzer images of the source at 3.6, 4.5, 5.8 and 8 μm. These show that the central bar has a more or less uniform emission structure, although with evidence for condensations which are similar to, and in most cases coincidental with, comparable low-excitation structures noted in [N ii]. There is also evidence for an increase in 8/4.5 μm and 5.8/4.5 μm emission ratios with distance from the nucleus, and for an extension of 8 and 5.8 μm emission beyond the ionized regime; a trend which is attributed to strong polycyclic aromatic hydrocarbon band emission within the nebular photodissociative regime.

Keywords: ISM: jets and outflows; ISM: lines and bands; planetary nebulae: individual: NGC 650-1; infrared: ISM

Journal Article.  6337 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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