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We analyze the galaxy pairs in a volume limited sample ($M_r \leq -21$) fromthe SDSS to study the effects of galaxy interactions on the star formation rateand colour of galaxies in different environments. We study the star formationrate and colour of the paired galaxies as a function of projected separationand compare the results with their control samples matched in stellar mass,redshift and local density. We find that the major interactions significantlyenhance the star formation rate in paired galaxies and turn them bluer withdecreasing pair separation within $30$ kpc. The impact of tidal interactions onstar formation rate and colour are more significant in the heavier members ofthe major pairs. The star formation enhancement in major pairs is significantlyhigher at the low-density environments, where the influence can extend up to$\sim 100$ kpc. Contrarily, the major pairs at high-density environments showsuppression in their star formation. Depending on the embedding environments,the major interactions in the intrinsically brighter galaxy pairs can thusenhance or quench star formation. We find that the minor pairs at bothlow-density and high-density environments are significantly less star-formingand redder than their control galaxies. It indicates that the minorinteractions in intrinsically brighter galaxy pairs always suppress the starformation irrespective of their environment. The lighter members in these minorpairs show a greater susceptibility to suppressed star formation. Our resultsimply that both the major and minor interactions can contribute to the observedbimodality. We conclude that the galaxy evolution is determined by a complexinterplay between the galaxy properties, galaxy interactions, and environment.

Galaxy interactions in different environments: An analysis of galaxy pairs from the SDSS