Astronomy Chpt 21, Stellar Explosions

25 July 2022
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1.4 solar masses
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The Chandrasekhar mass limit is
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mass-transfer binary
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For a nova to occur, the system must have already been a
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a Type II supernova
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Which of these does not depend on a close binary system to occur?
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rich in hydrogen from the outer envelope of the collapsed star.
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Type I supernovae are NOT
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by neutron capture during a type II supernova explosion.
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The heaviest nuclei of all are formed
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Type I supernova
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A recurrent nova could eventually build up to a
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day
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A 20 solar mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a
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even numbered elements
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The alpha process tends to produce chiefly
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neutrino
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In neutronization of the core, a proton and an electron make a neutron and a
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1.4 solar masses, the Chandrasekhar Limit.
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For a white dwarf to explode entirely as a Type I supernova, it's mass must be
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neutrinos
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Most of the energy of the supernova is carried outward via a flood of
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hydrogen and helium
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Nearly all the elements found in nature were formed inside stars, except for
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nova
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A surface explosion on a white dwarf, caused by falling matter from the atmosphere of its binary companion, creates what kind of object?
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an evolved red giant which is just starting to make silicon in its core
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Which of these is the likely progenitor of a type II supernova?
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1.4 solar masses.
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The Chandrasekhar mass limit is
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rich in hydrogen from the outer envelope of the collapsed star.
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Type I supernovae are NOT
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by neutron capture during a type II supernova explosion.
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The heaviest nuclei of all are formed
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a mass-transfer binary, with the white dwarf already at 1.3 solar masses
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Which of these is the likely progenitor of a type I supernova?
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It was originally a low-mass star.
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What can you conclude about a Type I supernova?
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white dwarfs and companion stars producing recurrent Type I supernova events
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Which of these events is not possible?
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a million Suns.
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The total energy emitted by the brightest nova explosions is about
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nickel 56.
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As seen in 1987, when two silicon 28 nuclei fuse, or when seven alpha particles are added to a Si-28 nucleus, the initial result in either case is
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oxygen 16
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When helium capture occurs with a carbon 12 nucleus, what results?
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type II supernovae.
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The making of abundant iron nuclei is typical of
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mass transfer onto a white dwarf pushing it over 1.4 solar masses
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What produces a type-I supernova?
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Even numbered elements, for helium is "giant food" for everything beyond itself.
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Which type of heavy atomic nuclei are most common, and why?
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decay of nickel 56 and cobalt 56 in a supernova remnant.
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The iron we commonly find in our surroundings came from
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in the core collapse that set the stage of Type II supernovae.
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The heaviest nuclei of all are formed
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they immediately pass through the core and escape to space.
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When a stellar iron core collapses, large numbers of neutrinos are formed, then:
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the upper mass limit for a white dwarf.
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The Chandrasekhar limit is
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Neutrons have no repulsive barrier to overcome in combining with positively charged nuclei.
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Why does neutron capture work?
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100 times more
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What is the amount of energy emitted in the form of neutrinos, during a supernova explosion, compared to the amount of energy radiated as electromagnetic radiation?
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1054 AD by Chinese and other oriental and mid eastern astronomers.
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The supernova that formed M-1, the Crab Nebula, was observed in
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fission of heavy nuclei back toward lighter ones.
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Beyond the formation of iron, nuclear energy can be produced only by
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a type II supernova
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In order of visual luminosity at the start, which is most luminous?
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even numbered elements.
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The alpha process tends to produce chiefly
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only once.
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A star can be a supernova
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Energy is released from the decay of radioactive cobalt 56 to iron 56.
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What is the reason a type-I supernova slows its dimming after about 2 months?
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Type I supernova.
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A recurrent nova could eventually build up to a
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type I supernova.
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If it gains sufficient mass, a white dwarf can become a
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brighter than type II supernovae.
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Type I supernovae are NOT
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Neutrons have no repulsive barrier to overcome in combining with positively charged
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Why does neutron capture work?
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by neutron capture during a type II supernova explosion.
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The heaviest nuclei of all are formed
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a masstransfer binary, with the white dwarf already at 1.3 solar masses
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Which of these is the likely progenitor of a type I supernova?
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type II supernovae.
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The making of abundant iron nuclei is typical of
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mass transfer onto a white dwarf pushing it over 1.4 solar masses
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What produces a type I supernova?
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decay of nickel 56 and cobalt 56 in a supernova remnant.
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The iron we commonly find in our surroundings came from
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in the core collapse that set the stage of Type II supernovae.
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The heaviest nuclei of all are formed