ИСТИНА

We study the circumstellar medium of massive stars, and aim particularly at investigating the role and the effects of stellar motion on to the interstellar medium (ISM). The resulting nebulae are bowshocks with observable characteristics that are determined by stellar properties such as the mass loss rate and the wind velocity, but also by the ISM parameters such as its density. To this end, we ran a grid of models for 10, 20 and 40 Msun stars which move through the ISM and whose properties evolve at the same time. This wind-ISM interaction is modelled with various physical processes such as radiative cooling (Wiersma et al., 2011) and heating as well as electronic thermal conduction (Cowie et al., 1977) using the PLUTO MHD code (Mignone et al., 2006). The treatment of the dissipative processes discriminates fully ionised from partially neutral medium at low temperatures.