  We investigate the short-term optical variability of two gamma Cas analogs,
pi Aqr and BZ Cru, thanks to intensive ground-based spectroscopic and
space-borne photometric monitorings. For both stars, low-amplitude (mmag)
coherent photometric variability is detected. The associated signals display
long-term amplitude variations, as in other Be stars. However, these signals
appear at high frequencies, especially in pi Aqr, indicating p-modes with a
high degree l, a quite unusual feature amongst Be stars. While BZ Cru presents
only low-level spectral variability, without clear periodicity, this is not the
case of pi Aqr. In this star, the dominant photometric frequencies, near ~12/d,
are confirmed spectroscopically in separate monitorings taken during very
different disk activity levels ; the spectroscopic analysis suggests a probable
tesseral nature for the mode.
