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Continuum Scattering and Formation of Emission Lines
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The effect of radiation scattering in continuum on the spectral lines formation is treated. Compared to the early works in this direction, the conditions of emission lines appearance in the atmosphere with the temperature gradient with depth is discussed in detail. For simplicity's sake, the coherent scattering in the spectral line frequencies is adopted. By the example of atmospheres of supergiant stars of type A and adjacent classes, it is shown which lines and in what parts of the spectrum can be observed in the emission.