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Homework Help: Protostar average luminosity question

  1. Feb 23, 2009 #1
    1. The problem statement, all variables and given/known data

    I have to find the average luminosity of a 9 solar mass protostar as it contracts.

    What I know about the star

    M = 1.79x10^34 g (Mass)
    R = 2.94x10^11 km (Radius)
    p = 1.67x10^-16 g/cm^3 (Initial number Density)
    Tff = 2.07x10^13 s <---(Gravitational free-fall)

    2. Relevant equations

    What equation am I suppose to use?

    3. The attempt at a solution

    I have looked around and can only find http://books.google.ca/books?id=2QVm...um=3&ct=result [Broken] and the standard luminosity equation but I don't know the temperature so I can't use that.

    I have no idea how to do this. Any help would be appreciated.
    Last edited by a moderator: May 4, 2017
  2. jcsd
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