Narrow components in UV line profiles as evidence for a two component stellar wind for O and B stars

The UV resonance line of early type stars show narrow absorption components, with a width of the order of 300 km s-1, superimposed on the wider P Cygni profiles. Such narrow components have been detected in the Copernicus spectra of a few early type stars. The variability of these components has been studied and it is shown that the narrow components do not change in velocity (except for the CIII lambda1175 line in zeta Pup) but that the strength of the components can change drastically. In some stars the narrow components were present in only one of the two spectra. The author has studied the characteristics of these narrow components in the Copernicus spectra. The stars are listed and examples of these narrow components are shown. (Auth.)