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Life of a Star

How these connect

Hydrogen fusion: the proton-proton chain and the CNO cycle and what it relates to. Every line is an evidence-backed relation, and the arrangement is fixed — this address draws this picture, today and next year.

evidence_for — Direct detection of CNO neutrinos confirms the secondary hydrogen-burning route that dominates in stars above roughly 1.3 solar masses.part_of — Core hydrogen fusion by the proton-proton chain or the CNO cycle is what defines the main-sequence phase.part_of — Hydrogen burning is the first and longest-running of the nuclear processes that build the elements inside stars.governs — Models place the crossover from proton-proton to CNO dominance near 1.3 solar masses, because the CNO rate is far more temperature-sensitive.governs — Position along the main sequence, core temperature, dominant fusion cycle and lifetime are all set principally by initial mass.depends_on — About 98.5 per cent of the Sun's present energy output comes from the proton-proton chain and about 1.5 per cent from the CNO cycle.instance_of — The Sun is a G-type main-sequence star currently fusing hydrogen in its core.Initial stellar massInitial stellar massNeutrinos from the solar CNO cycle are detectedNeutrinos from the solar …The SunThe SunMain sequence (core hydrogen burning)Main sequence (core hydro…Hydrogen fusion: the proton-proton chain and the CNO cycleHydrogen fusion: the prot…Stellar nucleosynthesisStellar nucleosynthesis
6 drawn · 10 reachable and not drawn · positions derived from object ids, never from a simulation
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Every relation drawn, in words7
  1. Neutrinos from the solar CNO cycle are detected · evidence_for · Hydrogen fusion: the proton-proton chain and the CNO cycle

    Direct detection of CNO neutrinos confirms the secondary hydrogen-burning route that dominates in stars above roughly 1.3 solar masses.

  2. Hydrogen fusion: the proton-proton chain and the CNO cycle · part_of · Main sequence (core hydrogen burning)

    Core hydrogen fusion by the proton-proton chain or the CNO cycle is what defines the main-sequence phase.

  3. Hydrogen fusion: the proton-proton chain and the CNO cycle · part_of · Stellar nucleosynthesis

    Hydrogen burning is the first and longest-running of the nuclear processes that build the elements inside stars.

  4. Initial stellar mass · governs · Hydrogen fusion: the proton-proton chain and the CNO cycle

    Models place the crossover from proton-proton to CNO dominance near 1.3 solar masses, because the CNO rate is far more temperature-sensitive.

  5. Initial stellar mass · governs · Main sequence (core hydrogen burning)

    Position along the main sequence, core temperature, dominant fusion cycle and lifetime are all set principally by initial mass.

  6. The Sun · depends_on · Hydrogen fusion: the proton-proton chain and the CNO cycle

    About 98.5 per cent of the Sun's present energy output comes from the proton-proton chain and about 1.5 per cent from the CNO cycle.

  7. The Sun · instance_of · Main sequence (core hydrogen burning)

    The Sun is a G-type main-sequence star currently fusing hydrogen in its core.