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Nature of science:
Observation and deduction: Observations of stellar spectra showed the existence of different elements in stars. Deductions from nuclear fusion theory were able to explain this. (1.8)
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Understandings:
- The Jeans criterion
- Nuclear fusion
- Nucleosynthesis off the main sequence
- Type Ia and II supernovae
Applications and skills:
- Applying the Jeans criterion to star formation
- Describing the different types of nuclear fusion reactions taking place off the main sequence
- Applying the mass–luminosity relation to compare lifetimes on the main sequence relative to that of our Sun
- Describing the formation of elements in stars that are heavier than iron including the required increases in temperature
- Qualitatively describe the s and r processes for neutron capture
- Distinguishing between type Ia and II supernovae
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Aims:
- Aim 10: analysis of nucleosynthesis involves the work of chemists
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Guidance:
- Only an elementary application of the Jeans criterion is required, ie collapse of an interstellar cloud may begin if M > Mj
- Students should be aware of the use of type Ia supernovae as standard candles
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