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A Standard disk model

  1. May 28, 2017 #1
    hi i'm an astronomy student and i was studying the standard accretion disk model and i've got some questions related to it.!

    why do we consider the accretion disk to be stationary in standard accretion disk model?????
    and what are the limitations of standard disk model????

    and i just read somewhere that '' The thin disk approximation is not valid in the whole disk'' can anyone tell me why is it so???
     
  2. jcsd
  3. May 30, 2017 #2
    Most approximations are not completely valid. If earth was a sphere there would be no mountains, no waves on the sea.

    Also some things do not radiate perfectly.
     
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