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Stellar evolution - Coggle Diagram
Stellar evolution
7 stellar evolution stage
Step 4: Stars enter its Main Sequence.
Step 5: Forms into a SUPER Red Giant.
Step 3: Nuclear fusion causes light and energy to be released.
Step 6: Produces a Supernova.
Step 2: Forms protosun
Step 7: Black Hole or Neutron Star forms.
Step 1: Large cloud of gas
Nebula (hydrogen and helium)
Massive star
Red Supergiant
Supernova
Neutron Star (Oppenheimer limit: original star cannot exceed over 2.15 solar masses), (Neutron degeneracy pressure)
Black hole
Low mass
Red Giant
Planetary nebula
White dwarf (Chandrasekhar limit-1.4 solar mass)
(Electron degeneracy pressure-Pauli exclusion principle)
Black dwarf
Nova
Orange dwarf star
Red dwarf star
Yellow dwarf star
Main sequence star
Nucleosynthesis
3 helium nuclei form carbon
Carbon plus helium produces oxygen
Oxygen plus helium produces neon
When 4 hydrogen atoms fuse to form 1 helium
(Proton-proton cycle)
Nuclear reactions- 2 hydrogen fuse to become helium
Produce silicon then silicon fuse to make iron
Protostar
Main sequence star
T tauri star
Protostar
Star forming nebula
Some brown dwarfs stars