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17 Cards in this Set
- Front
- Back
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Hydrogen Shell-burning |
As the core converts more and more of the H into He, the H in the shell surrounding the non-burning He ash burns more violently. |
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helium flash |
once the burning of a star begins, the core laggs to react to the changing conditions of the star and its temperatures rise sharply in a run away explosion |
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planetary nebula |
the core exhausts the last remaining feul, it contracts and heats up, causeing the UV rays to ionize the inner parts of the surrounding cloud |
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white dwarf |
remnant of the dying star is a small (about Earth-sized)blue-white star |
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electron degeneracy pressure |
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black dwarf |
the true final fate of any sun. cold dense burnt out cinder in space |
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nova |
what we see when a white dwarf undergoes a violent explosion
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accretion disk |
when a white dwarf is close enough to a main sequence companion to where it can steal some of its materials in the formation of a disk
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supernovae type Ia |
—white dwarf detonation– Very little H, light curves like novae– White dwarf accretes material aboveChandrasekhar mass (1.4 MSun) |
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supernovae type II |
—core collapse supernova– H-rich, have a plateau in light curve– Core collapse from high mass star |
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supernovae remnant |
Supernova remnants are "recycled" into nebula that thenform new stars with a higher percentage of heavierelements. Our Sun, and the atoms in our bodies, areprobably the product of ancient supernova explosions. Weare, in essence, made of star-stuff! |
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neutron star |
type of stellar remnant that can result from the gravitational collapse of a massivestar after a supernova. Neutron stars are the densest and smallest stars known to exist |
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neutron degeneracy pressure |
because the neutron is much more massive than the electron, neutron degeneracy pressure is much larger and can support stars more massive than the Chandrasekhar mass limit.
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black hole |
Black holes are places where ordinary gravity has become so extreme that it overwhelms all other forces in the Universe. Occur in center of galaxies
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low mass star |
Burns H->He, He->C then done– Lets go of its atmosphere in a planetary nebula– Leaves a white dwarf |
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high mass star |
Burns all the way to iron (Fe)– Dies spectacularly in a Type II Supernova– Leaves behind a neutron star or black hole |
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the life cycle of a star |
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