OB-stars as extreme condition test beds

Abstract

Massive stars are inherently extreme objects, in terms of radiation, mass loss, rotation, and sometimes also magnetic fields. Concentrating on a (personally biased) subset of processes related to pulsations, rapid rotation and its interplay with mass-loss, and the bi-stability mechanism, we will discuss how active (and normal) OB stars can serve as appropriate laboratories to provide further clues.Comment: To be published in the proceedings book of the IAUS 272, Cambridge University Press. Editors C. Neiner, G. Wade, G. Meynet and G. Peter