A35 Chapter 20 - Chapter 20 Stellar Evolution The Deaths of Stars Stars between 0.4 and 4 solar masses go through two distinct red giant stages(1 Red

A35 Chapter 20 - Chapter 20 Stellar Evolution The Deaths of...

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Chapter 20: Stellar Evolution: The Deaths of Stars Stars between 0.4 and 4 solar masses go through two distinct red giant stages: (1) Red giant (2) [Core Helium Fusion: core expands] (3) [Horizontal Branch – luminosity doesn’t change, but star evolves] (4) [Shell Helium Fusion: core contracts, releases heat into surrounding gasses] (5) AGM (asymptotic giant branch stars) stars Carbon-oxygen core; evolutionary track = asymptotic giant branch Dredge-ups bring the products of nuclear fusion to a giant star’s surface how stars change phases Sequence (p. 529): Main sequence star leaves main sequence star is red giant helium flash star is horizontal branch star star becomes AGB star thermal pulses White Dwarf: the cooled, contracted burned-out core of a moderately low mass star Kept from collapsing by the pressure of its degenerate electrons Mass-radius relation: the more massive a white dwarf, the smaller it is High-mass stars create heavy elements in their cores fusion Certain temperatures give yield different stages of fusion (see Table 20-1, p. 535)
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  • Spring '09
  • RobertKirshner
  • Stellar Evolution, Supernova, Asymptotic giant branch, horizontal branch

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