2005A&A...435..657A

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 FeI and FeII lines. FeI and FeII iron abundances and respective total errors [FeI/H]=-0.66±0.12 and [FeII/H]=-0.69±0.24 are found. Abundances of α (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]≃[Si/Fe]≃[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 α-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±1.99km/s.