Skip to content
RichseenAtlas← JourneySign in

Life of a Star

How these connect

Initial stellar mass 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.

part_of — Core hydrogen fusion by the proton-proton chain or the CNO cycle is what defines the main-sequence phase.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.constrained_by — Below roughly 0.07 to 0.09 solar masses, depending on composition, a contracting object never ignites sustained hydrogen fusion and becomes a brown dwarf.precedes — Contraction ends and the main sequence begins at the moment core fusion supplies the entire radiated luminosity.governs — Core collapse requires an initial mass above roughly eight solar masses; below that the star sheds its envelope instead.Initial stellar massInitial stellar massSupernovaSupernovaProtostarProtostarMain sequence (core hydrogen burning)Main sequence (core hydro…Hydrogen fusion: the proton-proton chain and the CNO cycleHydrogen fusion: the prot…
5 drawn · 11 reachable and not drawn · positions derived from object ids, never from a simulation
Open more4
Every relation drawn, in words6
  1. 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.

  2. 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.

  3. 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.

  4. Protostar · constrained_by · Initial stellar mass

    Below roughly 0.07 to 0.09 solar masses, depending on composition, a contracting object never ignites sustained hydrogen fusion and becomes a brown dwarf.

  5. Protostar · precedes · Main sequence (core hydrogen burning)

    Contraction ends and the main sequence begins at the moment core fusion supplies the entire radiated luminosity.

  6. Initial stellar mass · governs · Supernova

    Core collapse requires an initial mass above roughly eight solar masses; below that the star sheds its envelope instead.