VLT-UVES analysis of 5 giants in 47 Tucanae

High resolution spectra of 5 giants, including a horizontal branch star, of the metal-rich globular cluster 47 Tucanae were obtained with the UVES spectrograph at the 8m VLT UT2-Kueyen telescope. The atmospheric parameters (T-eff, log g, [Fe/H], v(t)) were derived from VIJK photometry and spectroscopic data based on Fe I and Fe II lines. Fe I and Fe II iron abundances and respective total errors [ Fe I/H] = - 0.66 +/- 0.12 and [ Fe II/H] = - 0.69 +/- 0.24 are found. Abundances of alpha (O, Mg, Ca, Si, Ti), odd-Z (Na, Al), s-(Ba, La, Zr), and r-process (Eu) elements were determined by means of spectrum synthesis. The main results are [O/Fe] = + 0.35 +/- 0.11, [Mg/Fe] approximate to [Si/Fe] approximate to [Ti/Fe]=+ 0.23 +/- 0.17, [Ca/Fe] = 0.0 +/- 0.15, [Ba/Fe] = + 0.31 +/- 0.22 and [Eu/Fe] = + 0.33 +/- 0.10. Overabundances of the alpha-elements O, Mg, Si and Ti, and of Eu are similar to those seen in halo metal-poor stars, whereas a solar Ca-to-Fe ratio resembles the values found in bulge stars. An overall metallicity Z = 0.006 or [M/H] = - 0.45 is thus obtained, as is a mean heliocentric radial velocity v(r)(hel) = - 22.43 +/- 1.99 km s(-1).