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Copy of Stellar Evolution: OCR GCSE P7
Transcript
Stellar evolution
Fusion and Star Structure
Small stars < 4x size of Sun
1 . Nebulae
clouds of dust and gas
2. Protostars
3. Main Sequence star
You need to know
about fusion
as well as the structure of a star
Fusion
At very high temperatures and pressures nucleus can fuse .
Why does it have to be so hot ?
Because Nucleus repel each other
Why so much energy ???
Remember the 6 layers Core- Radiative-Convection- Photosphere- Chromosphere
Corona
and what happens in each layer
Core - Hot enough for fusion
Radiative zone
photons pass through this layer by radiative diffusion
Convection Zone currents carry the energy through this zone
photosphere: the innermost layer of the sun's atmosphere that gives off visible light.
chromosphere: the middle layer of the sun's atmosphere.
corona: The outermost layer of the sun's atmosphere that extends into space.
4. Red Giant
Fuses larger elements
They are really big !
5. Planetary Nebulae
Red giant runs out of fuel and fusion stops Shells lost
6. White Dwarf
Large Stars > 4x mass of sun
have short lives !
1. Nebula- 2. Protostar-3. Main sequence
5. Supernova
6. Neutron stars or black holes
Keeping it simply 4 Hydrogen atoms fuse make a helium and lots of energy !
Sun Structure
because......
4. Red Supergiants
7. Black dwarf ?
Good Luck with the exams everyone !
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