Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..306s&link_type=abstract
Astronomy and Astrophysics, vol. 118, no. 2, Feb. 1983, p. 306-312. Research supported by the Naturvetenskapliga Forskningsrade
Astronomy and Astrophysics
Astrophysics
18
Astronomical Spectroscopy, Hydrocyanic Acid, Hyperfine Structure, Molecular Clouds, Anomalies, Astronomical Maps, Emission Spectra, Nebulae
Scientific paper
The authors present high spatial and frequency resolution HCN, J = 1-0 observations of the molecular cloud S 235B and the dark cloud L 673. Both clouds show clear anomalies in the hyperfine intensities. The molecular cloud S 235B has the most extreme line anomalies ever observed in a molecular cloud. However, while the recent model by Guilloteau and Baudry (1981) appears to satisfactorily explain the hyperfine anomalies as being due to line overlap effects in the J = 2-1 line in molecular clouds, the dark cloud results are not easily reproduced. The authors suggest that in a dark cloud like L 673 line saturation dominates, although some non-LTE effects also can be seen.
Hoglund Bertil
Kisliakov A. G.
Sandell Goeran
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