Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..184b&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 184-192.
Astronomy and Astrophysics
Astrophysics
48
Absorption Spectra, Carbon Monoxide, Infrared Absorption, Red Giant Stars, Stellar Mass Ejection, Stellar Spectrophotometry, Gas Density, Gas Temperature, Late Stars, Molecular Spectroscopy, Stellar Envelopes
Scientific paper
Observations of the fundamental 4.6 micron band of CO in nine red giants are presented. A common feature is multiple absorption lines which are identified as products of separate components or shells. Column densities are derived; the relative values should be free of the uncertainties inherent in determining the absolute scale. These column densities are well fitted by single excitation temperatures for each absorption component; these excitation temperatures are identified with the local kinetic temperatures. There is no correlation of CO column density with either gas or dust column density nor of the expansion velocity of the component with its distance from the star. The evidence is reviewed, and it is concluded that mass loss from red giants is most likely episodic in nature.
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