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Gratton (INAF - Osservatorio Astronomico Di Padova), Sofia Randich (INAF - Osservatorio Astrofisico Di Arcetri)","submitted_at":"2006-12-27T18:17:34Z","abstract_excerpt":"Aims: To measure the beryllium abundance in two TO stars of the Globular Cluster NGC 6752, one oxygen rich and sodium poor, the other presumably oxygen poor and sodium rich. Be abundances in these stars are used to put on firmer grounds the hypothesis of Be as cosmochronometer and to investigate the formation of Globular Clusters. Method:We present near UV spectra with resolution R$\\sim 45000$ obtained with the UVES spectrograph on the 8.2m VLT Kueyen telescope, analysed with spectrum synthesis based on plane parallel LTE model atmospheres. 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