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CNO Cycle

  1. May 28, 2015 #1
    Dear PF Forum,
    StellarNucleoSynthesis1.JPG
    Is this picture correct?
    Or it is not CNO Cycle?
    I get that video from this



    Thanks for any answer
     
    Last edited: May 28, 2015
  2. jcsd
  3. May 28, 2015 #2
    The CNO cycle involves nitrogen rather than neon.
     
  4. May 28, 2015 #3
    Yep, I think it makes more sense.

    Carbon -> Nitrogen -> Oxygen
    12 -> 14 -> 16
    But I've seen it twice if not three times on youtube on diferent videos.
    So perhaps what they actually mean is alpha process?
    Carbon + He4 -> Oxygen
    Oxygen + He4 -> Neon?

    Thanks

    Steven
     
  5. May 28, 2015 #4
    The CNO cycle produces 4He, not consumes it. There are intermediate stages involving neon in some variations of the CNO cycles, but these only occur at very high temperatures. The basic cycle is carbon>nitrogen>oxygen>carbon, the full reaction is given on the CNO cycle wiki page.
     
  6. May 28, 2015 #5

    Drakkith

    User Avatar

    Staff: Mentor

    That picture is not the CNO cycle, which, as Vagn pointed out, converts hydrogen to helium in a multi-step process.

    Actually I think the picture is referring to the triple alpha process, then the carbon burning process, and then the neon burning process.

    http://en.wikipedia.org/wiki/Triple-alpha_process
    http://en.wikipedia.org/wiki/Carbon-burning_process
    http://en.wikipedia.org/wiki/Neon-burning_process
     
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