Es11
15
The Birth and Death of Stars
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Transcript of Es11
The Birth and Death of Stars
ObjectiveObjective
Describe the life cycle of a star
Interpret a Hertzsprung-Russell diagram
Main sequence starMain sequence star
Protostar: formed from dust and gas. Why? Gravity.
Compression -> heat.
Heat -> hydrogen fusion
Red giant starRed giant star
Red giantRed giant
Star runs out of H, begins to swell.
A dying star can…A dying star can…
1. Cool into a dwarf star (white, then black)
OR
2. If it’s big, explode in a supernova.
(fusion, contraction & expansion, form heavier elements, then supernova)
Neutron StarNeutron Star
Supernova throws gas and dust into space. Dense core left = neutron star.
If big enough, becomes black hole.
