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High resolution spectra (R > 40 000) for 9 main sequence turn-off stars and 9subgiants in the globular cluster NGC 6752 were acquired with UVES on theVLT-Kueyen (UT2). These data have been used to determine the abundances of someheavy elements (strontium, yttrium, barium and europium). This paper presentsfor the first time accurate results for heavy elements in this globularcluster. We did not find any systematic effect between the abundances found inturn-off stars, subgiants, and giants. We obtain the following mean abundancesfor these elements in our sample (turn-off stars and subgiants): [Sr/Fe] = 0.06+/- 0.16, [Y/Fe] = -0.01 +/- 0.12, [Ba/Fe] = 0.18 +/- 0.11, and [Eu/Fe] = 0.41+/- 0.09. The dispersion in the abundance ratios of the different elements islow and can be totally explained by uncertainties in their derivation. Theseratios are in agreement with the values found in field halo stars with the samemetallicity. We did not observe any correlation between the [n-capture/Fe]ratios and the star-to-star variations of the O and Na abundances. The [Ba/Eu]and [Sr/Ba] ratios show clearly that this globular cluster has also beenuniformly enriched by r- and s-process synthesis.Comment: 10 pages, 8 figures. Accepted for publication in A&

Heavy elements abundances in turn-off stars and early subgiants in NGC 6752