The relation between column densities of interstellar OH and CH molecules

Abstract

We present a new, close relation between column densities of OH and CH molecules based on 16 translucent sightlines (six of them new) and confirm the theoretical oscillator strengths of the OH A--X transitions at 3078 and 3082 Å(0.00105, 0.000648) and CH B--X transitions at 3886 and 3890 Å, (0.00320, 0.00210), respectively. We also report no difference between observed and previously modelled abundances of the OH molecule.

4 pages, 0 figures, accepted for publication in MNRAS

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