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We have obtained the first beryllium measurements of late F/early G-typestars in the old open cluster M67 (4.5 Gyr) and in the intermediate age clusterIC 4651 (1.7 Gyr). One member of the young cluster IC 2391 (~50 Myr) was alsoobserved. Our sample stars have effective temperatures within a range of +30 -+380 K from the solar temperature. All our sample stars, including the Sun andthe young cluster star have, within the errors, the same Be abundance. Thisresult implies that late F/early G-type stars undergo very little (if any) Bedepletion during their main-sequence life-time. Since these stars haveundergone some Li depletion, our finding is indicative of shallow mixing, i.e.of a mixing process that can transport surface material deep enough for Liburning to occur, but not deep enough for Be burning. As shown in previousstudies, the Li vs. Be diagram is a powerful diagnostic of stellar interiors.In this context, we do not find any evidence of correlated Li and Be depletion;furthermore, a comparison with various models shows that the Be pattern of oursample stars is compatible only with models including gravity waves. This classof models, however, cannot reproduce the Li observations of M 67.Comment: to appear in A&

UVES Be observations of early–G dwarfs in old clusters