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Semimajor axis of binary system help

  1. May 1, 2009 #1
    Default semimajor axis of binary system help
    hi, I'm not sure if I am posting in the right place but I could really do with some help figuring out the semi major axis of a binary star system.

    I have been give the mean distance of each star from the center of mass (star A = 3.96 AU star B = 6.34 AU)
    mean angular separation of 0.74 arcsec
    distance of 12.4 pc
    orbital period 26.28 years.

    Do I use the mean distance of both stars from the center mass and divide by 2 to get the semi major axis or do I use the mean angular separation.

    sorry I seem to have jut missed the point on this question so any help would be fab
    thanks
     
  2. jcsd
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