  High-resolution spectroscopic observations of the rapidly rotating delta
Scuti star gamma Bootis have been carried out on 2005, over 6 consecutive
nights, in order to search for line-profile variability. Time series,
consisting of flux measurements at each wavelength bin across the TiII 4571.917
A line profile as a function of time, have been Fourier analyzed. The results
confirm the early detection reported by Kennelly et al. (1992) of a dominant
periodic component at frequency 21.28 c/d in the observer's frame, probably due
to a high azimuthal order sectorial mode. Moreover, we found other
periodicities at 5.06 c/d, 12.09 c/d, probably present but not secure, and at
11.70 c/d and 18.09 c/d, uncertain. The latter frequency, if present, should be
identifiable as another high azimuthal order sectorial mode and three
additional terms, probably due to low-l modes, as proved by the analysis of the
first three moments of the line. Owing to the short time baseline and the
one-site temporal sampling we consider our results only preliminary but
encouraging for a more extensive multisite campaign. A refinement of the
atmospheric physical parameters of the star has been obtained from our
spectroscopic data and adopted for preliminary computations of evolutionary
models of gamma Bootis.
