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Astronomy: Local Thermodynamic Equilibrium, Gaunt Factor

  1. Oct 27, 2016 #1
    1. The problem statement, all variables and given/known


    2. Relevant equations
    show that a hydrogen gas cloud at 10000K is about twice as optically thick at the Balmer limit compared with the Paschen limit. Assume that the H atoms are in Local Thermodynamic Equilibrium, the Gaunt factor is unity at all energy levels, and include absorption by H to levels up to n=10. Note that hf1/k=1.578*10^5K for lyman limit photon of frequency f1.

    3. The attempt at a solution
    an(f)=[64/(3*3^0.5) A] (pi a0^2)n(fn/f)^3 gbf(n)
    gbf(n)=1
    sorry just dont know how to type those symbols
     
  2. jcsd
  3. Nov 1, 2016 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
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