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We analyse a sample of 71 triplets of luminous galaxies derived from the workof O'Mill et al. (2012). We compare the properties of triplets and theirmembers with those of control samples of compact groups, the ten brightestmembers of rich clusters, and galaxies in pairs. The triplets are restricted tohave members with spectroscopic redshifts in the range 0.01<z<0.14 andMr<-20.5. We analyse the stellar mass (SM) content, the star formation rates,the Dn(4000) parameter and colour index and also analyse different globalproperties of these systems as total star formation activity and globalcolours. We calculate the probability that the properties of galaxies intriplets are strongly correlated. We define the triplet compactness as ameasure of the percentage of the system total area that is filled by the lightof member galaxies. Our analysis suggest that triplet galaxy members behavesimilarly to compact group members and galaxies in rich clusters. We also findthat systems comprising 3 blue, star-forming, young stellar population galaxies(blue triplets) are most probably real systems and not a chance configurationof interloping galaxies. The same holds for triplets composed by 3 red, nonstar-forming galaxies, showing the correlation of galaxy properties in thesesystems. From the analysis of the triplet as a whole, we conclude that, at agiven total SM content, triplets show a total star formation activity andglobal colours similar to compact groups. However, blue triplets show a hightotal star formation activity with a lower SM content. From an analysis of thecompactness parameter of the systems we find that light is even moreconcentrated in triplets than in compact groups. We propose that tripletscomposed by 3 luminous galaxies, should not be considered as an analogous ofgalaxy pairs with an extra member, but rather they are a natural extension ofcompact groups.

Galaxy triplets in Sloan Digital Sky Survey Data Release 7: II. A connection with compact groups?