A search for observational evidence of OH molecule photoproduction

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Masers, Molecular Processes, Circumstellar Matter, Stars: Mass-Loss, Stars: Variables: Other, Radio Lines: Stars

Scientific paper

Observational evidence for OH molecule photoproduction by the interstellar UV radiation in the circumstellar envelopes of Mira variables has been searched for. A sample of Me-type Miras was observed in the main OH maser lines with the Nancay radio telescope. Two new lines were detected. The intensity of the 156.5-nm wavelength interstellar radiation is estimated by integration of the observed UV light of OB stars in common star catalogues. A statistically significant trend is found that OH Miras are illuminated by stronger UV fields than non-OH objects.

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