ast power point stellar I - 2 He 4 → 4 Be 7 γ 31 4 Be 7...

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Stellar Evolution I Text for Stellar Evolution I and II: Chap 17 Overview of Stellar  Structure H-R diagram is basically Stefan-Boltzmann  applied to stars. Can estimate relative properties of stars  using Stefan-Boltzmann + H-R diagram: 
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OBAFGKM: spectral 'class' assigned  based on spectral lines present re-ordered to be T sequence Mnemonic: Oh Be A Fine Girl/Guy, Kiss Me (tardis.byu.edu/sdb/Mneumonic.html for  others; or search     “mneumonic: OBAFGKM”
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Gravity = Pressure yields  stable star              = P  + P
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Energy Generation Energy via nuclear reactions two types: - fission – atoms split - fusion – atoms joined together more energy generated by joining  than splitting
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fission:   
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Net reaction: 1 H      4 He + Energy using atomic masses: 4(1.008172) = 4.003875 + 
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1 H 1 + 1 H 1 1 H 2 + e + + ν e 1 H 2 + 1 H 1 2 He 3 + γ 2 He 3 + 2 He 3 2 He 4 + 2 1 H 1 69% 2 He 3 +
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Unformatted text preview: 2 He 4 → 4 Be 7 + γ 31% 4 Be 7 + e-→ 3 Li 7 + ν e 99.7% 3 Li 7 + 1 H 1 → 2 2 He 4 4 Be 7 + 1 H 1 → 5 B 8 + γ 0.3% 5 B 8 → 4 Be 8 + e + + ν e 4 Be 8 → 2 2 He 4 RED GIANT Must have Gravity= Pressure throughout core in star when fuel runs low? core contracts --> raises temperature --> star expands by ~1000-10,000 times: Red Giant or Red Supergiant IF star has sufficient mass, then core T sufficiently high that eventually, -core contracts sufficiently that -excess energy blows off star's outer layers core remains as white dwarf very small (Earth size!) v very hot conduction is primary method of heat loss --> similar to hot chunk of metal that cools Planetary nebula White dwarf about the size of the Binary star system...
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ast power point stellar I - 2 He 4 → 4 Be 7 γ 31 4 Be 7...

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