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lect 13 - Stellar Evolution The Deaths of Stars Chapter 20...

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Stellar Evolution: The Deaths of Stars Chapter 20 part I: Low-mass Stars
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Pathways of Stellar Evolution
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Low-mass stars go through two distinct red-giant stages A low-mass star becomes – a red giant when shell hydrogen fusion begins – a horizontal-branch star when core helium fusion begins – an asymptotic giant branch (AGB) star when the helium in the core is exhausted and shell helium fusion begins
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Bringing the products of nuclear fusion to a giant star’s surface As a low-mass star ages, convection occurs over a larger portion of its volume This takes heavy elements formed in the star’s interior and distributes them throughout the star
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