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The study of dynamical properties of Galactic open clusters is a fundamentalprerequisite for the comprehension of their dissolution processes. In thiswork, we characterized 12 open clusters, namely: Collinder 258, NGC 6756,Czernik 37, NGC 5381, Ruprecht 111, Ruprecht 102, NGC 6249, Basel 5, Ruprecht97, Trumpler 25, ESO 129-SC32 and BH 150, projected against dense stellarfields. In order to do that, we employed Washington $CT_{1}$ photometry andGAIA DR2 astrometry, combined with a decontamination algorithm applied to thethree-dimensional astrometric space of proper motions and parallaxes. From thederived membership likelihoods, we built decontaminated colour-magnitudediagrams, while structural parameters were obtained from King profiles fitting.Our analysis revealed that they are relatively young open clusters (log($t$yr$^{-1}$) $\sim7.3-8.6$), placed along the Sagittarius spiral arm, and atdifferent internal dynamical stages. We found that the half-light radius toJacobi radius ratio, the concentration parameter and the age to relaxation timeratio describe satisfactorily their different stages of dynamical evolution.Those relative more dynamically evolved open clusters have apparentlyexperienced more important low-mass star loss.

Characterizing dynamical stages of open clusters located in the Sagittarius spiral arm