Publication Date:
2013-04-13
Description:
We report observations of four weak absorption lines of the interstellar CN A 2 -X 2 + (3,0) band: R 1 (0) 6951.8 Å, R Q 21 (0) 6927.3 Å, R 2 (1)+ R Q 1 (1) 6926.7 Å, Q R 12 (1)+Q 1 (1) 6953.6 Å, and show that they provide reasonable information on column densities in sightlines towards early-type stars. The (3,0) band is always very weak and thus the saturation effect is negligible, which is particularly useful for the sightlines where the near UV-range CN bands are very strong, i.e. saturated.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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