The Products from Burning He4 from hydrogen burning He3 from incomplete PP chain D, Li, Be and B are bypassed C12 and O16 from helium burning O18 and Ne22 due to α capture by N14 N14 from CNO conversion to N14 Ne20, Na, Mg, Al, Si28 from Carbon burning Mg, Al, … Stellar nucleosynthesis has occurred since the original creation of hydrogen , helium and lithium during the Big Bang . Following Stellar Nucleosynthesis The calculation of stellar nucleosynthesis requires the simultaneous solution for a set of coupled ﬀtial equations, each of which has the form dNX dt = NaNX f aX NX ˝ + NbNY f bY + NZ ˝p +::: = NX ˝aX NX ˝ + NY ˝bY + NZ ˝p +::: (13:1:1) To appreciate the problem, let’s examine the individual terms. HS-ESS1-3: Stellar Nucleosynthesis. This collapse raises the temperature in the core until it is hot enough to burn the "ash" from the previous reactions. Stellar nucleosynthesis is the creation (nucleosynthesis) of chemical elements by nuclear fusion reactions within stars.
When a star fuses helium, carbon or neon atoms together, the atoms will combine to form bigger atoms with greater amounts of protons and electrons.
(Energy and Matter) Clarification Statement: Emphasis is on the way nucleosynthesis, and therefore the different elements created, varies as a function of the mass of a star and the stage of its lifetime. Creating the Heavier Elements The burning of helium to produce heavier elements then continues for about 1 million years. Stellar Nucleosynthesis Figure 1 shows the relative abundances of solar system elements versus atomic number Z, the number of protons in the nucleus. One believes, of course, that all but the lightest elements (Z > 4) are made in stars rather than the early universe, and primarily through nuclear fusion. Balancing Nuclear Equations. This second process only occurs in modern stars enriched from the nucleosynthesis of earlier stars. Stellar nucleosynthesis continues to create heavier and heavier elements until you end up with iron. Once the core "burns" up its fuel, there is no outward force to balance the pull of gravity and the star begins to collapse. Communicate scientific ideas about the way stars, over their life cycle, produce elements. A theory of nucleosynthesis should explain this pattern. To see how the processes work, we can put them into a balanced “nuclear equation” format.