  The environment where galaxies reside affects their evolutionary histories.
Galaxy triplets (systems composed of three physically bound galaxies)
constitute one of simplest group of galaxies and are therefore excellent
laboratories to study evolutionary mechanisms where effects of the environment
are minimal. We present a statistical study of the dynamical properties of
isolated galaxy triplets as a function of their local and large scale
environments. To explore the connection of the dynamical evolution on the
systems with the evolution of the galaxies composing the triplets, we consider
observational properties as morphology and star formation rate (SFR). We used
the SDSS-based catalog of Isolated Triplets (SIT), which contains 315 triplets.
We classified each triplet according to galaxy morphologies and defined a
parameter $Q_{trip}$ to quantify the total local tidal strengths in the
systems. To quantify the dynamical stage of the system we used the parameters
harmonic radius, $R_H$, velocity dispersion, $\sigma_{vr}$, crossing time,
$H_0t_c$, and virial mass, $M_{vir}$. Triplets composed of three early type
galaxies present smallest $R_H$, indicating that they are in general more
compact than triplets with one or more late type galaxies. Among triplets with
low values of $R_H$ and $H_0t_c$, SIT triplets with $Q_{trip}$<-2 are relaxed
systems, more dynamically evolved, while triplets with $Q_{trip}$>-2 show
compact configurations due to interactions within the system, such as on-going
mergers. We found that there is no dominant galaxy in triplets in terms of
properties of stellar populations such as global colour and SFR. Moreover, the
global SFR in isolated triplets composed of two or more early-type galaxies
increases with the stellar mass ratio of the galaxies with respect to the
central galaxy, therefore the system is globally 'rejuvenated'.
