What kind of motion for a star does not produce a Doppler effect? Explain.

Transverse motion does not produced a doppler effect for a star. As, the doppler effect are occurred when the object are emitting light either in the direction towards the observer or moving away. The various astronomical objects are moving and the observer observed the blue wavelength of the light.

Doppler effect in the star is the process when the observer moves towards the star then it seems like the star move towards the observer.