  We investigate the activity induced signals related to rotation in late type
stars (FGKM). We analyse the Ca II H&K, the H alpha and the radial velocity
time-series of 55 stars using the spectra from the HARPS public database and
the light-curves provided by the ASAS survey. We search for short term periodic
signals in the time-series of activity indicators as well as in the photometric
light-curves. Radial velocity data sets are then analysed to determine the
presence of activity induced signals. We measure a radial velocity signal
induced by rotational modulation of stellar surface features in 37 stars, from
late F-type to mid M-type stars. We report an empirical relationship, with some
degree of spectral type dependency, between the mean level of chromospheric
emission measured by the log(Rhk) and the measured radial velocity semi
amplitude. We also report a relationship betweeen the semi amplitude of the
chromospheric measured signal and the semi amplitude of the radial velocity
induced signal, which strongly depends on the spectral type. We find that for a
given strength of chromospheric activity (i.e. a given rotation period) M-type
stars tend to induce larger rotation related radial velocity signals than G and
K-type stars.
