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

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Unformatted text preview: Stellar Evolution: The Deaths of Stars Chapter 20 part I: Low-mass Stars Pathways of Stellar Evolution 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 Bringing the products of nuclear fusion to a giant stars surface As a low-mass star ages, convection occurs over a larger portion of its volume This takes heavy elements formed in the stars interior and distributes them throughout the star A Carbon Star is a AGB star that has undergone a 3 rd dredge-up Carbon is transported to the surface by convection, and there are strong absorption bands of carbon-rich elements Stellar winds eject carbon-rich outer layers into space Low-mass stars die by gently ejecting their outer layers, creating planetary nebulae Helium shell flashes in an old, low-mass star produce thermal pulses during which more than half the stars mass may be...
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This note was uploaded on 02/06/2011 for the course ASTR 113 taught by Professor Geller during the Spring '08 term at George Mason.

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

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