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Spectroscopic and photometric variability of the O9.5Vp star HD93521

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Table 1. Summary of our observing runs (see text for the meaning of the different columns)
Fig. 2. Mean spectrum of HD 93521 over the 8420 – 8900 Å wavelength domain. The ions responsible for the lines (either stellar, or telluric in the case of the OH emissions) are indicated above the spectrum, whilst the diffuse interstellar bands (DIBs) are
Fig. 3. Determination of the rotational velocity of HD 93521 us- us-ing the Fourier technique
Fig. 5. Grey-scale 2-D Fourier power spectrum of the He i λ 6678 line as derived from the April 2005 data.
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