  High resolution spectra (R > 40 000) for 9 main sequence turn-off stars and 9
subgiants in the globular cluster NGC 6752 were acquired with UVES on the
VLT-Kueyen (UT2). These data have been used to determine the abundances of some
heavy elements (strontium, yttrium, barium and europium). This paper presents
for the first time accurate results for heavy elements in this globular
cluster. We did not find any systematic effect between the abundances found in
turn-off stars, subgiants, and giants. We obtain the following mean abundances
for 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 is
low and can be totally explained by uncertainties in their derivation. These
ratios are in agreement with the values found in field halo stars with the same
metallicity. 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 been
uniformly enriched by r- and s-process synthesis.
