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G. M. Harper (University of Colorado), Stellar Imager Vision Mission Team
Stellar Imager is a Vision mission conceived to study the nature and evolution of stellar dynamos and their impact on life in the universe. Its capabilities will include the imaging of ultraviolet transition region diagnostics at the sub-milliarcsecond level.
Here we examine some of the physical processes which affect the apparent size of ultraviolet sources as the radiation passes through the interstellar medium. We consider refraction scintillation from neutral hydrogen, along with single scattering halos from neutral hydrogen Rayleigh scattering and forward throwing dust grain scattering. Using the "thin phase screen" approximation we find that refraction scintillation produce negligible angular broadening. For low optical depths the single scattering halos have much greater angular extents than the proposed sub-milliarcsecond imaging and do not present a problem for Stellar Imager.
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Bulletin of the American Astronomical Society, 36 #2
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