Lecture 16

Lecture 16 - oday (Monday) in oday (Monday) in Astro Astro...

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Unformatted text preview: oday (Monday) in oday (Monday) in Astro Astro 3 3 z Today: Í Chapter 9 “The Sun” Í Next: Chapter 10 “…Stars” z Cell phones off now, please z Online quiz #5 covering chapters 8 and 9 due today by 10 p.m. Class #16 Chapter 9 -The Sun Units of Chapter 9 9 The Sun in Bulk 9 The Solar Interior The Solar Atmosphere The Active Sun The Heart of the Sun 9.1 The Sun in Bulk Gravitational equilibrium: The Sun is a huge ball of hydrogen and helium gas (mostly). The outward push of pressure balances the inward pull of gravity 9.1 The Sun in Bulk Interior structure of the Sun: uter layers are ot to scale. he visible surface is the photosphere. he core is where nergy is produced y nuclear fusion. 9.1 The Sun in Bulk Luminosity – total energy radiated by the Sun – can be calculated from the fraction of that energy that reaches Earth. Total luminosity is about 4 × 10 26 W – the equivalent of 10 billion 1-megaton nuclear bombs per second. 9.2 The Solar Interior It’s all gas… Inner parts have tremendous pressure due to weight of material further out Inner pressure is maintained by extremely high temperature High temperature is produced by nuclear fusion Solar density and temperature , according to the standard solar model: 9.2 The Solar Interior Energy transport The radiation zone is relatively transparent; the cooler convection zone is opaque: 9.2 The Solar Interior9....
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This note was uploaded on 04/16/2008 for the course ASTR 3 taught by Professor Hauser during the Fall '07 term at UCLA.

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Lecture 16 - oday (Monday) in oday (Monday) in Astro Astro...

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