Fig. 4
The high resolution FIES spectrum (red) of the region around the He i 5875.62 Å line is compared to the intermediate resolution spectrum (green) from 12 years before. The He i line shape has changed dramatically. The blue spectrum represents a synthetic spectrum from an ATLAS model (Teff = 15 000 K). The two U-shaped components represent two velocity shifted, rotating B5 stars.
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