The O+B Eclipsing Binary HD 165246

The physics that drive the evolution of O-type stars are not well understood. These stars experience a plethora of different phenomena which alter their evolution, including pulsations, chemical transport, wind mass-loss, rapid rotation, multiplicity, etc. In this chapter, we investigate the diverse variability observed in the massive O+B eclipsing binary HD 165246. We make use of space-based photometry assembled with the K2 mission as well as ground-based spectroscopy to characterise the pulsational variability observed in HD 165246.