Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..599t&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 599-604. Research supported by the University of Wyoming.
Astronomy and Astrophysics
Astronomy
27
Infrared Spectroscopy, Microwave Spectra, Molecular Clouds, Planetary Nebulae, Radio Sources (Astronomy), Stellar Evolution, Abundance, Asymptotic Giant Branch Stars, Carbon Isotopes, Carbon Monoxide, High Resolution, Millimeter Waves, Molecular Spectra, Near Infrared Radiation, Stellar Mass Ejection
Scientific paper
The analysis assumes that the neutral cloud found in the vicinity of NGC 7027 is in fact mass lost from the star at some point during the formation process, as opposed to a change coincidence between the planetary and a normal dark interstellar cloud. This is believed to be the case because of the identical radio molecular and radio recombination line velocities and the CO-12 line shape found in the cloud, which is clearly characteristic of mass loss from a central object. New J = 1 - 0 CO-12 and CO-13 millimeter-wave observations are presented. Whereas CO-12 is readily detected, CO-13 emission at a level reported previously for NGC 7027 is not confirmed. A C-12/C-13 isotope ratio greater than or equal to 36 + or - 6 is derived for the planetary. It is suggested on the basis of this value that NGC 7027 evolved from a 3-solar-mass star that passed through at least the asymptotic giant branch stage.
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