  In these proceedings we present initial results of a spectroscopic analysis
of a small sample of evolved K-giants in the globular cluster 47 Tucanae. We
derive the effective temperature, surface gravity and microturbulence of all
targets using standard methods. Further we derive LTE abundances of [Fe/H] and
[O/Fe] as well as the abundance of sodium, using NLTE corrections. We find a
mean metallicity for the cluster of [Fe/H]$=-0.75\pm0.10$, in excellent
agreement with several other studies. Also, we confirm the sodium-oxygen
anticorrelation previously reported by a number of other authors. Finally, we
see indications of the sodium enriched stars also being enriched in heavy
magnesium isotopes.

Solar and Stellar Astrophysics