Astro 101 10-17 - Astro 101 10-17-08 Interiors of stars 3.5...

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Astro 101 10-17-08 Interiors of stars 3.5 solar masses Inside, Convection Zone Outside, Radiative Zone 1 solar mass Inside, convection Middle, radiative Outside, radiative zone .5 solar masses Radiative inside and convection outside The Balance of Life Hydrostatic Equilibrium is the balance of gravity and pressure in each layer of a star This keeps a star from collapsing (or expanding) This balance is maintained as stars age, so that the size might shrink or grow to maintain it. Main-sequence evolution Fusion is occurring in the cores of stars. H is being converted to He Since 4 particles are converted to 1, the pressure drops The core collapses and heat up This heats the outer layers which expand outward The Sun on M-S 5 b years ago Beginning of its life on MS, sun has 1/3 L it has now 5 b years from now End of its life on main-sequence Sun will have twice the luminosity it has now Stellar Evolution When H is exhausted, the core shrinks It heats up but cannot yet burn He, which needs 100 mil K
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Astro 101 10-17 - Astro 101 10-17-08 Interiors of stars 3.5...

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