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Copernicus observational searches for OH and H2O in diffuse clouds
An intensive search for OH and H2O in the directions of Sigma Sco, AlphaCam, and Omicron Per was undertaken with the Copernicus satellite.Multiple scans were carried out over the wavelength region for theexpected absorption features due to the OH D-X and H2O C-X transitions.The feature due to OH was possibly detected toward Sigma Sco, and onlyan upper limit can be given toward Alpha Cam. H2O was not detected inany of the stars at the signal level accumulated. The OH abundancetoward Sigma Sco and the respective lower limits for the OH/H2O ratiosare discussed with regard to the extant models for the steady-stateabundances of OH and H2O, and shown not to be inconsistent withion-molecule schemes.
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