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Solve these equations numerically - Stellar Abundance Ratios

  1. Sep 4, 2015 #1


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    Gold Member

    1. Question from a textbook.
    I have written down the differential equations for part a) and shown part b),
    but I am unsure of how to tackle part c).

    2. This is the Question from the book
    http://www.m-rossi.com/img/asp3012-1.png [Broken]

    Any advice would be grateful. Thank you
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Sep 5, 2015 #2


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    2017 Award

    Staff: Mentor

    It is a numerical integration. Start with x=1, calculate the derivatives, estimate the numbers a small time step later, continue until the fraction of remaining helium is negligible.
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