  We construct a star with uniform density in frame of tracking Rastall
gravity, in which the density of effective dark matter tracks the density of
dark energy. To demonstrate stability of the star we analyse the axial
gravitational perturbations of the star. We find that echo wavelets naturally
appear in the axial gravitational waves when the dark matter plays a
significant role in construction of the star. We show that the physical origin
of this echo roots in the potential valley near the surface of star. This
effect leads to a clue to detect Rastall dark energy from the ringdown phase of
gravitational wave from binary stars enriched by dark matter.
