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ast power point stellar - recall HR diagram plot of...

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recall HR diagram: - plot of luminosity vs. temperature - both quantities are SURFACE quantities Questions: - why the 'main sequence' band? - how are the stars in the upper right and lower left related to the main sequence? - how do stars evolve?
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Stellar Interior Structure observe hundreds of nearby stars little variability observed --> stable over long times geology: stable over at least 100s Myr how?
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Today - pages/sections: pp 495-496, figure 14.8 pp 529-534
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F Gravity = F Pressure gravity pulls outer stellar layers in pressure pushes stellar layers outward pressure = ?
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F pressure = gas pressure + radiation pressure gas pressure: hot gas! --> convection
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radiation pressure: Lots of interesting physics: - Interaction between gas and radiation pressure - Interaction between radiation and atoms
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Source of hot gas + radiation = energy generated at star's core 3 rd heat transfer method = ?
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Figure 14.8 in words if star heats up slightly: - pressure increases slightly -
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