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Elemental Abundance in Stars - The Curve of Growth

  1. Dec 20, 2012 #1
    I am studying for my undergraduate Astrophysics module and the lectures notes say that that all abundances are measured relative, in terms of H = 12.00 by mass or number of atoms. Is this correct? I thought it was all based off of Carbon = 12. Am I missing something?
  2. jcsd
  3. Dec 20, 2012 #2


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    Staff: Mentor

    The definition of amu (used for isotope masses) depends on carbon-12, maybe you mixed those two definitions?
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