  We discuss here the pulsation properties of the $\delta$ Scuti star BV
Circini on the basis of data obtained during a simultaneous photometric and
spectroscopic campaign in 1996 and a spectroscopic one in 1998, and taking also
advantage of the previous photometric observations by Kurtz (1981). Nine
pulsation modes were detected from photometry and thirteen from spectroscopy;
five of them are in common to both techniques. The spectroscopic data give
ample evidence of dramatic amplitude variations in some modes, in particular
the strongest spectroscopic mode in 1998 was not detectable in 1996 data. The
two dominant photometric modes (6.33 and 7.89 c\d) are observed on both
seasons. The typing of the modes was performed by means of a simultaneous model
fit of line profile and light variations. The 6.33 c\d photometric term is
probably the fundamental radial mode, while the 7.89 c\d is a nonradial mode
with mi different than 0. There are six high-degree prograde modes with an
azimuthal order m ranging from -12 to -14, and also a retrograde mode with m~7.
These modes combined with the identification of the 6.33 c\d mode allowed us to
estimate i~60 deg for the value of the inclination of the rotation axis. An
accurate evaluation of the main stellar physical parameters is also proposed as
a result of the pulsational analysis.
