Age calibration from star clusters

Their colour- magnitude diagrams show the effects of stellar evolution of approximately coeval objects with the same chemical composition. Furthermore, the determination of their astrophysical parameters (age, distance, colour excess and metallicity) together with their spatial distribution provides information about the structure and the evolution of the Galaxy itself.

Using data from the Gaia DR3 and 2MASS catalogues, we develop methodologies for characterizing open clusters. Precise membership lists, mean astrometric parameters and radii are obtained. Using photometric data from both data sources, we carried out new age calibrations that rely on morphological indices based on colour ({DELTA}B-R) and magnitude ({DELTA}G) differences between the red clump and the turnoff for a sample of 34 open clusters with ages covering the interval 8.3<log[t(yr)]<9.9.