You observe the spectral changes shown in the figure below, in a wavelength region where a stationary source would give an emission line at 486.1 nm. You interpret the two peaks sometimes visible as due to two stars that are in orbit around each other. Answer the following questions assuming the stars are both moving in circular orbits about some point between them, and that the plane of the orbit is along our line of sight. For these problems, round the values of peak and trough positions to the nearest 0.1nm for all calculations