Unsolved Problems in Stellar Physics: A Conference in Honor of Douglas Gough
[en] Main-sequence: early-type stars ; Magnetic and electric fields ; polarization of starlight ; Stellar structure ; interiors ; evolution ; nucleosynthesis ; ages ; Abundances ; chemical composition
[en] Evolutionary models for massive stars which take into account rotational mixing effects do not predict any core-processed material at the surface of B dwarfs with low rotational velocities. We present a detailed and fully homogeneous non-LTE abundance analysis of a sample of largely unevolved B stars which points to the existence of a population of intrinsically slowly-rotating, yet nitrogen-rich objects contrary to theoretical expectations. These observations are discussed in relation to the boron content and the (weak) magnetic field detected in some targets.