We present the analysis of simultaneous multicolour uvyI _ { C } photometry and low-resolution spectroscopy for the rapidly rotating \beta Cephei star SY Equ .
From the photometric time series , we confirm the dominant pulsation frequency , f _ { 1 } = 6.029 d ^ { -1 } , and we find an evidence for two additional modes .
In spectroscopy , the highest peak occurs at f _ { a } = 0.197 d ^ { -1 } or its alias 0.803 d ^ { -1 } .
It can be interpreted either in terms of a binary motion or as the g -mode pulsation .
In addition , we reveal the pulsation mode with frequency of about 6.029 d ^ { -1 } , i.e .
the same which dominates photometric variations , and a few new candidates .
For the dominant frequency we obtain mode identification from the combined photometric and spectroscopic observations .
From non-adiabatic pulsation calculations , we show that the frequency of the dominant mode in SY Equ is consistent with the stellar models of much lower effective temperatures than used in many papers .