Astronomy The Solar System

Physics & Astronomy

Quiz 16 :

Evolution of Low-Mass Stars

Quiz 16 :

Evolution of Low-Mass Stars

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A feature unique to main-sequence stars is that
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E

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As a main-sequence star burns its core supply of hydrogen, what happens?
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D

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A 10 MSUN star will evolve through the same phases as a
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C

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The Sun will become a red giant star in about
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The ________ a main-sequence star is, the more hydrogen it has to burn, and the ________ its main-sequence lifetime.
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Stars evolve primarily because
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If a main-sequence star's core temperature increased, fusion reaction rates would ________ because the protons would be moving ________.
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The percentage of hydrogen in the Sun's core today is roughly ________ of what it was originally.
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The low-end mass cutoff for stars occurs at approximately
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The largest low-mass stars have masses that are approximately
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How long will a 2 MSUN star live as a main-sequence star?
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The luminosity of a star depends on
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What factor is most important in determining a star's position on the main sequence and its subsequent evolution?
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If the Milky Way formed stars at approximately a constant rate over the last 14 billion years, what fraction of the M-type stars that ever formed in it can still be found as main-sequence stars today? (Note that M-type stars have a mass of approximately 0.5 MSUN.)
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Using the data in the figure shown below, identify the spectral type of a star that has a main-sequence lifetime of about 500 billion years. img
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The main-sequence lifetime of a star is given by which equation?
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Use the figure shown below and the relationship t M/L to estimate the main-sequence lifetime of a star with a mass equal to 10 times that of the Sun.(Note that the Sun's main-sequence lifetime is about 1010 years.) img
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Which star spends the longest time as a main-sequence star?
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As a low-mass main-sequence star runs out of fuel in its core, it grows more luminous. How is this possible?
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When a star depletes its core supply of hydrogen, the core will
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