Shape and evolution of wind-blown bubbles of massive stars: on the effect of the interstellar magnetic field

Understand

The winds of massive stars create large (>10 pc) bubbles around their progenitors.

• As these bubbles expand they encounter the interstellar coherent magnetic field which, depending on its strength, can influence the shape of the bubble.
• We wish to investigate if, and how much, the interstellar magnetic field can contribute to the shape of an expanding circumstellar bubble around a massive star.
• We use the MPI-AMRVAC code to make magneto-hydrodynamical simulations of bubbles, using a single star model, combined with several different field strengths: B = 5, 10, and 20 muG for the interstellar magnetic field.