Spectroscopic and photometric variability of the O9.5 Vp star HD 93521 G. Rauw, M. De Becker, H. van Winckel, C. Aerts, P. Eenens, K. Lefever, B. Vandenbussche, N. Linder, Y. Nazé and E. Gosset A&A, 487 2 (2008) 659-670 Published online: 24 June 2008 DOI: 10.1051/0004-6361:200810002