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Past studies have already shown that stars in open clusters are chemicallyhomogeneous (e.g. De Silva et al. 2006, 2007 and 2009). These results supportthe idea that stars born from the same giant molecular cloud should have thesame chemical composition. In this context, the chemical tagging technique wasproposed by Freeman & Bland-Hawthorn 2002. The principle is to recoverdisrupted stellar clusters by looking only to the stellar chemical composition.In order to evaluate the feasibility of this approach, it is necessary to testif we can distinguish between stars born from different molecular clouds. Forthis purpose, we studied the chemical composition of stars in 32 old andintermediate-age open clusters, and we applied machine learning algorithms torecover the original cluster by only considering the chemical signatures.

Do open clusters have distinguishable chemical signatures?