Q: What is the size of each star's
     shift in wavelength?


        shift  =  about 2 Angstroms  

               =  about 0.2 nm


  Q: The rest wavelength of the top set
     of lines is 448.1 nm.  What is the
     orbital speed of each star?

                   shift in wavelength
        speed  =  -------------------- * (speed of light)
                    rest wavelength 

                    0.2 nm
               =  ------------- *  3 x 10^(8) m/s 
                   448.1 nm
     

               =  130,000  m/s