Chemical abundances of M giants in the Galactic centre: A single metal-rich population with low [alpha/Fe]
Context. The formation and evolution of the Milky Way bulge is still largely an unanswered question. Some of the most essential observations needed for its modelling are the metallicity distribution and the trends of the alpha elements, as measured in stars. While bulge regions beyond R greater than or similar to 50 pc of the centre have been targeted in several surveys, the central part has escap