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High-resolution UVES/VLT spectra of B12, an extreme pole-on Be star in theSMC cluster NGC330, have been analysed using non-LTE model atmospheres toobtain its chemical composition relative to the SMC standard star AV304. Wefind a general underabundance of metals which can be understood in terms of anextra contribution to the stellar continuum due to emission from a disk whichwe estimate to be at the ~25% level. When this is corrected for, the nitrogenabundance for B12 shows no evidence of enhancement by rotational mixing as hasbeen found in other non-Be B-type stars in NGC330, and is inconsistent withevolutionary models which include the effects of rotational mixing. A second Bestar, NGC330-B17, is also shown to have no detectable nitrogen lines. Possibleexplanations for the lack of rotational mixing in these rapidly rotating starsare discussed, one promising solution being the possibility that magneticfields might inhibit rotational mixing.

A Be star with a low nitrogen abundance in the SMC cluster NGC 330