Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..625g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 625-638. Research supported by NFR, NORDITA, and NWO
Astronomy and Astrophysics
Astrophysics
44
Absorption Spectra, Cn Emission, Interstellar Gas, Molecular Clouds, Astronomical Spectroscopy, Emission Spectra, Interstellar Matter, Red Shift
Scientific paper
New measurements of interstellar CN in translucent molecular clouds are presented. The CN is observed by optical absorption lines in both the B 2Sigma(+) violet and A 2Pi - X 2Sigma(+) red systems and through the N = 1-0 emission lines at 113.491 GHz. It is shown how the unsaturated lines of the red system can be used to determine the Doppler parameter b and thus to assess the saturation corrections in the analysis of the stronger lines of the violet system. In all cases, the Doppler parameter is small, b less than about 1 km/s, and agrees well with the velocity dispersion obtained from (C-13)O millimeter emission of lines in the same direction but averaged over a different volume of gas.
Black John Harry
Gredel Roland
van Dishoeck Ewine F.
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