1. Introduction

2. Observations and data processing
2.1. The Gamma Velorum open cluster
2.2. Target selection and Observations
2.3. Available data

3. UVES vs. Giraffe

4. Membership analysis

5. Abundance analysis of the members of Gamma Velorum
5.1. Iron abundance
5.2. Other elements
5.3. The metal rich star J08095427 − 4721419
5.4. A quantitative estimate of the effects of rocky material accretion on the mainly radiative PMS star J08095427 − 4721419

6. Conclusions