3D Simulations of Magnetic Massive Star Winds

Due to computational requirements and numerical difficulties associated with coordinate singularity in spherical geometry, fully dynamic 3D magnetohydrodynamic (MHD) simulations of massive star winds are not readily available. Here we report preliminary results of the first such a 3D simulation using $\theta^1$ Ori C (O5.5 V) as a model. The oblique magnetic rotator $\theta^1$ Ori C is a source of hard X-ray emitting plasma in its circumstellar environment. Our numerical model can explain both the hardness and the location of the X-ray emission from this star confirming that magnetically confined wind shock (MCWS) is the dominating mechanism for hard Xrays in some massive stars.