On the motion of wind-driving stars relative to the ambient interstellar medium (Q1894138)

It is argued that each wind-driving star is subject to the action of thrust forces appearing in relative motion of the star with respect to the ambient interstellar medium. Starting from hydrodynamic modelling of the stellar wind system in an adiabatically adapted motion relative to the local interstellar medium, the equation of star motion is derived and then investigated analytically. The authors calculate the resulting net force which is of an accelerating and decelerating nature, respectively, for subsonic and supersonic flows. Also the long-period motions of star is described together with the estimation of typical acceleration time periods for different stars.