Other
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..866h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 866-872.
Other
21
Carbon Monoxide, Planetary Nebulae, Red Shift, Spectral Emission, Bipolarity, Earth Atmosphere, Molecular Spectra, Red Giant Stars, Spectral Resolution
Scientific paper
The authors report observations of the CO(2-1) line in the bipolar (bowtie) planetary nebula NGC 2346 to study the distribution and kinematics of the molecular gas. The CO emission is dominated by two distinct components with a velocity separation of 21 km s-1, but weaker emission extends over a total range of 56 km s-1. The velocity-integrated map of CO is elongated along the minor axis of the optical nebula and is consistent with other observations in indicating that dense matter at the nebular waist plays an important role in the bipolar structure. Along the major axis of the nebula, the redshifted and blueshifted CO components are offset about the center, which is consistent with a tilted geometry suggested by the kinematics of the ionized gas. Along the minor axis at low intensity levels there is evidence for some degree of continuous CO distribution around the nebular waist. Mass estimates show that ⪆40% of the total mass of the nebula is in the form of molecular gas.
Healy A. P.
Huggins Patrick J.
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