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ASTA02H3 Lecture Notes - Ideal Gas Law, White Dwarf, Planetary Nebula

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Parandis Khavari

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Astronomy - Session 11
life of a star after the main sequence stage
after core depleted of Hydrogen
100% Helium
Hydrogen stops fusion
no energy
more pressure
gravity contracts core
temperature rises
gravitational contractions
a thin shell burns
is added to the (mass of) the core
Helium core (and Hydrogen shell burning)
energy from burning shell
gravitational energy
temperature rises to 100,000,000K
Helium fuses into Carbon and Oxygen
Helium core
red giant
yellow giant
burning of Helium
enough energy to stop gravitational contraction
same as Horizontal Branch stars
once the core is depleted of Helium
star begins to contract
soon, a burning shell will form immediately around the core
the upper Hydrogen shell burning deposits Helium in a layer between the two shells
the star cools and expands
becomes a giant again
it moves along an evolutionary track called the Asymptotic Giant Branch
(AGB) Asymptotic Giant Branch
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(I) red giant
Hydrogen shell burning
expands and cools down
(II) horizontal branch (yellow giant)
Helium in core is fused
Hydrogen shell burning
dormant core of Helium
contraction and heats up
(III) Asymptotic Giant Branch (AGB)
dormant Carbon and Oxygen core
Helium and Hydrogen shell burning
expanding and cooling down
Asymptotic Giant Branch (AGB)
very bright
solar wind envelopes AGB in dust
dust covers AGB
dust absorbs photons
makes light (look) infrared
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