Image Details
Caption: Figure 14.
P Cygni profiles in the C IV doublet for a pair of O3.5 dwarfs (left panels) and O4–5 giants (right panels) in the LMC. The velocity scale refers to the blue component of the doublet, and has been shifted to remove the systemic velocity of the LMC. Although the profiles are broadly similar within each classification “bin,” the examples shown in the lower panels exhibit extended regions with no flux. The presence of “black troughs” in some stars but not others indicates that different levels of small-scale velocity dispersion exist within the winds of otherwise similar stars, for reasons that have not yet been explained.
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