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Astrophysics: Lane-Emden equation, polytropes, low mass red giants

  1. Nov 15, 2013 #1
    1. The problem statement, all variables and given/known data
    The problem reads:
    In the core a low mass red giant the free electrons are completely degenerate. Suppose that the mass of the core is 0.5 * M_sun (Mass of the sun). Assume that the core can be described by a polytrope and calculate its radius using the mass-radius relationship.


    2. Relevant equations



    3. The attempt at a solution
    So I'm aware of the mass-radius relation found from the Lane-Emden equation, but I am not sure what value for index, n, I should use for the core of a low mass red giant--specifically one that has free electrons that are completely degenerate.
     
  2. jcsd
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