Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.139...63s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 139, no. 1, Dec. 1987, p. 63-73.
Astronomy and Astrophysics
Astrophysics
10
Hydroxyl Emission, Interstellar Radiation, Late Stars, Stellar Envelopes, Ultraviolet Radiation, Abundance, Astronomical Catalogs, Infrared Stars, Interstellar Masers, Spatial Distribution
Scientific paper
The interstellar UV field at 1565 Å is calculated around nearby OH/IR sources. The front-back asymmetry observed in the 1612 MHz maser line profile is well correlated with anisotropy of the interstellar UV flux. For some sources the spatial positions of the 1612 MHz masers are confined to the position angles for which stronger UV radiation occurs. These facts strongly support the theory of the photoproduction of OH from H2O induced by ambient interstellar UV photons penetrating the circumstellar shell. A simple model of the 1612 MHz maser with OH photoproduction suggests that the influence of the UV field on the observed maser profiles is governed by the mass loss rate and the relative abundances of OH and H2O molecules.
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