Abstract
Runaway O stars have high peculiar velocities of ~ 30-100 km s-1. These stars flow through the galactic plane, and interact with the surrounding ISM. This interaction produces two types of structure: an H II region and a stellar wind bow shock. The bow shocks have characteristic sizes of ~ 1-5 pc, and are observed mostly in the far IR. The H II regions have much larger characteristic sizes of ~ 100 pc, completely enveloping the bow shock. We present detailed axisymmetric radiation gasdynamic numerical simulations of both the H II region and the stellar wind bow shock of an O5 star, moving at a velocity of 100 km s-1 through a homogeneous, neutral environment of density n=1 cm-3. The characteristics of the star/environment interaction are described in detail, and predictions of observable quantities (in both optical and IR wavelengths) are carried out.
