How Is Total Radial Velocity Determined in Binary Stars?

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Total radial velocity in binary stars is determined by observing wavelength shifts in the light emitted by each star. The radial velocity of each star is calculated by analyzing the degree of redshift or blueshift in their spectral lines, which corresponds to their speed relative to the observer. By measuring these shifts, astronomers can deduce the individual velocities of the stars within the binary system. The combined effect of both stars' velocities provides the total radial velocity of the binary system. Accurate measurements of these shifts are crucial for understanding the dynamics of binary star systems.
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I know that in spectroscopic Binaries, you can observe wavelength shifts in each star. But how do you determine the total radial velocity of this system alltogether, and how do you find each star's radial velocity?
 
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You can determine the radial velocity of a particular star based on the wavelength of light, since a specific speed corresponds to a specific level of red/blue shift.
 

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