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We use SDSS-DR14 to construct a sample of galaxy systems consisting of acentral object and two satellites. We adopt projected distance and radialvelocity difference criteria and impose an isolation criterion to avoidmembership in larger structures. We also classify the interaction between themembers of each system through a visual inspection of galaxy images, finding$\sim80\%$ of the systems lack evidence of interactions whilst the remaining$\sim20\%$ involve some kind of interaction, as inferred from their observeddistorted morphology. We have considered separately, samples of satellites andcentral galaxies, and each of these samples were tested against suitablecontrol sets to analyse the results. We find that central galaxies showingsigns of interactions present evidence of enhanced star formation activity andyounger stellar populations. As a counterpart, satellite samples show thesegalaxies presenting older stellar populations with a lower star formation ratethan the control sample. The observed trends correlate with the stellar masscontent of the galaxies and with the projected distance between the membersinvolved in the interaction. The most massive systems are less affected sincethey show no star formation excess, possibly due to their more evolved stageand less gas available to form new stars. Our results suggest that it isarguable a transfer of material during interactions, with satellites acting asdonors to the central galaxy. As a consequence of the interactions, satellitestellar population ages rapidly and new bursts of star formation may frequentlyoccur in the central galaxy.

Satellites and central galaxies in SDSS: the influence of interactions on their properties