Binary double star terms given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts, therefore the correct answer is option C.
The Doppler effect is a phenomenon that occurs when two objects move closer or farther apart, increasing (or decreasing) the frequency of sound, light, or other waves.
The Doppler effect is to sound waves as well for the light waves
The Doppler effect of light refers to the apparent change in frequency of the light that the observer perceives as a result of relative motion between the source of the light and the observer.
The correct answer is option C because the binary double star is the name given to a pair of stars whose orbital motion can be determined solely by observing their periodic Doppler shifts.
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