Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200..431t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 200, Aug. 1982, p. 431-444.
Astronomy and Astrophysics
Astronomy
12
Carbon Monoxide, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Absorption Spectra, Chemical Reactions, Iue, Molecular Spectra
Scientific paper
The absorption lines corresponding to the A-X transition of CO have been looked for in the IUE spectra of 14 stars with varying values of the colour excess, E(B-V) and found to be present in the spectra of nine stars with E(B-V) at least 0.28. The column density of CO has been determined towards these nine stars and its upper limit towards the rest of the stars. The curve of growth analysis has been found to show that the contribution to CO absorption is possibly from a single interstellar cloud for stars with E(B-V) less than 0.4 and from more than one cloud for stars with E(B-V) greater than 0.4. The observed column density of CO as a function of E(B-V) has been found to be in good agreement with that expected from the theory of ion-molecular chemistry.
Krishna Swamy K. S.
Tarafdar Shankar P.
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