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We present an analysis of high resolution VLT-FLAMES spectra of 61 B-typestars with relatively narrow-lined spectra located in 4 fields centered on theMilky Way clusters; NGC3293 & NGC4755 and the Large and Small Magellanic cloudclusters; NGC2004 and NGC330. For each object a quantitative analysis wascarried out using the non-LTE model atmosphere code TLUSTY; resulting in thedetermination of their atmospheric parameters and photospheric abundances ofthe dominant metal species (C, N, O, Mg, Si, Fe). The results are discussed inrelation to our earlier work on 3 younger clusters in these galaxies; NGC6611,N11 and NGC346 paying particular attention to the nitrogen abundances which arean important probe of the role of rotation in the evolution of stars. This workalong with that of the younger clusters provides a consistent dataset ofabundances and atmospheric parameters for over 100 B-type stars in the threegalaxies. We provide effective temperature scales for B-type dwarfs in allthree galaxies and for giants and supergiants in the SMC and LMC. In eachgalaxy a dependence on luminosity is found between the three classes with theunevolved dwarf objects having significantly higher effective temperatures. Ametallicity dependence is present between the SMC and Galactic dwarf objects,and whilst the LMC stars are only slightly cooler than the SMC stars, they aresignificantly hotter than their Galactic counterparts.

The VLT-FLAMES survey of massive stars: Evolution of surface N abundances and effective temperature scales in the Galaxy and Magellanic Clouds