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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for the effect of the interstellar far UV-radiation on circumstellar shells (1987)
    Springer
    Astrophysics and space science 139 (1987), S. 63-73 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643812
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