Effects of a Momentum Driven Stellar Wind on the Surrounding ISM

Massive stars shape the surrounding ISM by emitting ionizing photons and ejecting material through stellar winds. We study the impact of the transfer of momentum from the wind of a massive star on the surrounding neutral or ionized material. We use the Smoothed Particle Hydrodynamics (SPH) code SEREN [3] including a newly implemented HEALPix-based momentum conserving wind scheme. The transfer of momentum from a wind onto the cold surrounding gas drives the expansion of a shock front, sweeping up the neutral material into a dense shell. In contrast, we find the momentum driven wind to have only little direct effect on the warm ionized gas.