Upper panels: radial velocity vr of a dust grain (solid) and a gas particle (dotted, evaluated at the position of the dust grain in the frame of the star) as a function of time. At time t = 0, the gas is ionized and enters the H II region. Middle panels: relative density increase in dust along the trajectory. This value approaches unity when the gas and dust are coupled. Lower panels: velocity ratio of a gas particle vg,c, after momentum transfer with the dust, to an uncoupled gas particle vg,uc, which reflects the amount of momentum transferred from the dust to the gas. a) Velocity, density increase and the amount of momentum transfer, evaluated for a 300 Å dust grain with impact parameter b = 0.01. b) Same figures, but for a dust grain with a 300 Å radius.
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