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Astrophysics: radiation pressue&gas pressure

  1. Nov 6, 2012 #1
    first sorry for my english.

    i wrote the problem and equations.the result is:

    critical mass of a star =2,5x mass of the sun.

    but i couldn't find the result.pls help me to find the result with this equations.
  2. jcsd
  3. Nov 6, 2012 #2
    i solved the problem.

    tempeture of radiation and tempeture of gas are equal.And when i add a equation on the problem which is P=GM^2/R^4, i solve the problem.
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