|  |  |  | 
   
    | An
    example.  Suppose we measured the
    period in a spectroscopic binary 
 |  | 
   
    | and
    knew the spectral types (and hence the masses, as we shall see) of the 
 |  | 
   
    | component
    stars.  The period is 2 years (P = 2
    years) and the stars are a G 
 |  | 
   
    | star
    (1 solar mass) and a M star (0.5 solar masses).  What is the separation? 
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