Fig. 1

Sketch of a hydrodynamic astrospherical shock configuration. The red lines denote the shocks, the blue lines stand for tangential discontinuities. The Mach numbers in the different regions are indicated by M ≷ 1. BS denotes the bow shock, TS the termination shock, SL is the sonic line, S⋆ the position of the star, and C the middle point of an radius RM describing the Mach disk MD. TD is the tangential contact discontinuity starting at the triple point T, where the reflected shock RS also starts.
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