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We establish the nature and derive fundamental and structural parameters ofthe recently catalogued objects FSR1744, FSR89 and FSR31. This work intends toprovide clues to constrain the Galactic tidal disruption efficiency, improvestatistics of the open cluster parameter space, and better define theirage-distribution function inside the Solar circle. Properties of the objectsare investigated by means of 2MASS colour-magnitude diagrams and stellar radialdensity profiles built with field star decontaminated photometry.Diagnostic-diagrams for structural parameters are used to help disentangledynamical from high-background effects affecting such centrally projected openclusters. FSR1744, FSR89 and FSR31 are Gyr-class OCs located at Galactocentricdistances 4.0 - 5.6kpc. Compared to nearby OCs, they have small core andlimiting radii. With respect to the small number of OCs observed in the innerGalaxy, the emerging scenario in the near-infrared favours disruption driven bydynamical evolution rather than observational limitations associated withabsorption and/or high background levels. Internally, the main processesassociated with the dynamical evolution are, e.g. mass loss by stellarevolution, mass segregation and evaporation. Externally they are, e.g. tidalstress from the disk and bulge, and interactions with giant molecular clouds.FSR1744, FSR89 and FSR31 have structural parameters consistent with theirGalactocentric distances, in the sense that tidally induced effects may haveaccelerated the dynamical evolution.

Old open clusters in the inner Galaxy: FSR1744, FSR89 and FSR31