CO in the Helix nebula

Details CO in the Helix nebula CO in the Helix nebula

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305l..29h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 305, June 1, 1986, p. L29-L32.

Astronomy and Astrophysics

Astrophysics

37

Carbon Monoxide, Interstellar Gas, Molecular Gases, Planetary Nebulae, Astronomical Spectroscopy, Emission Spectra, Ring Structures, Spatial Distribution

Scientific paper

The authors report the detection of CO (2-1) emission from the Helix planetary nebula. The spatial distribution and kinematics of the CO emission indicate that the molecular gas is closely associated with the prominent ring structures seen in optical photographs. The CO velocity varies systematically with position in the nebula and is consistent with the simple kinematics of two expanding toroids. Mass estimates indicate that at least one-tenth of the nebular material has not yet been ionized by the central star.

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