Detection of C-13O radio emission from C-13-rich carbon stars

Details Detection of C-13O radio emission from C-13-rich carbon stars Detection of C-13O radio emission from C-13-rich carbon stars

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201...80j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 1, July 1988, p. 80-88. NASA-NSF-CNRS-supported research.

Astronomy and Astrophysics

Astrophysics

57

Carbon Stars, Nuclear Astrophysics, Radio Emission, Stellar Envelopes, Abundance, Line Spectra, Molecular Spectra, Radio Spectra, Solar Neighborhood, Stellar Mass Ejection

Scientific paper

The authors have detected a high ratio (>0.5) of 13CO/12CO radio emission in the J = 1 - 0 rotational line from three mass-losing carbon stars with high 13C/12C ratios. Since chemical fractionation, isotope-dependent photodissociation and opacity in the rotational and vibrational lines may not raise significantly the 13CO/12CO ratio above the actual 13C/12C ratio in these circumstellar envelopes, the relative abundance of 13C in these stars might be even greater by perhaps a factor of two than previously believed. The authors discuss the circumstances where the kinetic temperature of the gas in a circumstellar outflow might fall below the 2.7K of the microwave background.

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