Abstract
The infrared and radio continua of early type stars constitute one of the most reliable and powerful instruments for the investigation of the stellar winds surrounding these objects. All early type stars undergoing moderate mass-loss detected at these wavelengths show a clear excess of their continuum flux, which is attributed to the bound-free and free-free emission processes in the stellar winds. Further, as hν//kt > 1, NLTE-eifects in the line profiles are magnified (Mihalas 78) and the observed IR-spectral lines turn into ideal tools to study the stellar winds.
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