Carbon monoxide emission from planetary nebulae and their possible precursors

Details Carbon monoxide emission from planetary nebulae and their possible precursors Carbon monoxide emission from planetary nebulae and their possible precursors

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..611t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 611-617. Research supported by the University of Wyo

Astronomy and Astrophysics

Astrophysics

16

Astronomical Spectroscopy, Carbon Monoxide, Emission Spectra, Planetary Nebulae, Millimeter Waves, Molecular Clouds, Molecular Spectra, Stellar Evolution

Scientific paper

Carbon monoxide emission has been searched for in four planetary nebulae and four possible protoplanetary nebulae. No 12CO emission was seen in the planetary nebulae, nor in M1-92, to a level of TA* ≡ 20 mK. Improved 12CO spectra are discussed for AFGL 618, AGFL 2688, and CIT 6. All three objects were also detected in 13CO emission. This allowed lower limits to the [12C]/[13C] abundance ratio to be calculated.

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