most citedDetermination of the Physical Conditions of the Knots in the Helix Nebula from Optical and Infrared Observations

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astro-ph2007★ 35 cited

Determination of the Physical Conditions of the Knots in the Helix Nebula from Optical and Infrared Observations

C. R. O'Dell, W. J. Henney, G. J. Ferland

[Abridged] We use new HST and archived images to clarify the nature of the knots in the Helix Nebula. We employ published far infrared spectrophotometry and existing 2.12 micron im…