Rotationally broadened H_α line profiles using the fundamental parameters of α Cep and assuming rigid rotation. a) Line profiles adopting η = 0.57 (or V_eq = 267 km s^-1) and varying the inclination angle. For comparison sake, we have included the observed H_α line profile of α Cep. b) Line profiles adopting V_eqsini = 225 km s^-1 and varying η (or the inclination angle i).