Chapter 8

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As a star exhausts the hydrogen in its core, what happens?

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When does a star experience helium fusion?

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Why are giant and supergiant stars rare?

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Which of the following statements best describes why stars eventually die?

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Which of the following occurs during the giant stage?

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In what way are giants and supergiants similar?

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What is the term for a collection of 105 to 106 old stars in a region 30 to 100 light-years in diameter?

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What is the defining characteristic of stars within a cluster that are at the turnoff point?

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What is the approximate age of the star cluster in the H-R diagram? (Hint: Main sequence stars of spectral types O and B have a core supply of hydrogen that is sufficient to last about 250 million years; types A and F, about 2 billion years; type G about 10 billion years; types K and M about 30 billion years. The apparent magnitude scale means that larger numbers are toward the bottom of the vertical axis.)

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Refer to the H-R diagram. What type of star do the two data points above spectral type “A” represent?

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Refer to the H-R diagram. What type of star do the data points above spectral type “M” represent?

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Refer to the H-R diagram. How would the H-R diagram of an older star cluster look different

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Refer to the H-R diagram. How would the H-R diagram of a more distant star cluster look different?

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Which nuclear fuels does a one solar mass star use over the course of its entire lifespan?

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Star A is a 1 solar mass white dwarf, and star B is a 1.3 solar mass white dwarf. How would they differ?

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What is the source of the energy radiated by a white dwarf?

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What does the Chandrasekhar-Landau limit tell us?

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What is the ultimate fate of our Sun?

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Which scenario is most likely to happen when the Sun enters the red giant stage?

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If the stars at the turnoff point of a cluster have a mass of 3 times the mass of the Sun, what is the age of the cluster?

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Which of the following correctly describes a relationship between pressure, temperature, and density in degenerate matter?

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What is a white dwarf composed of?

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As a white dwarf cools, its radius remains the same. Why is this?

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What are the two longest stages in the life of a one solar mass star?

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Which of the following is the most important factor that determines a life cycle of a star (for example, why some stars have a short life span)?

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What principle explains why matter flowing from one star in a binary system to its companion forms an accretion disk?

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Suppose you discover a binary star system with a 0.7 solar mass giant star and a 2 solar mass main sequence star. Why is this surprising?

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When material expanding away from a star in a binary system reaches the edge of its Roche lobe, what happens?

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When mass is transferred toward a white dwarf in a binary system, the material forms a rapidly growing whirlpool of material. What is that whirlpool called?

Astronomy

As a star exhausts the hydrogen in its core, what happens?

When does a star experience helium fusion?

Why are giant and supergiant stars rare?

Which of the following statements best describes why stars eventually die?

Which of the following occurs during the giant stage?

In what way are giants and supergiants similar?

What is the term for a collection of 105 to 106 old stars in a region 30 to 100 light-years in diameter?

What is the defining characteristic of stars within a cluster that are at the turnoff point?

Refer to the H-R diagram. What type of star do the two data points above spectral type “A” represent?

Refer to the H-R diagram. What type of star do the data points above spectral type “M” represent?

Refer to the H-R diagram. How would the H-R diagram of an older star cluster look different

Refer to the H-R diagram. How would the H-R diagram of a more distant star cluster look different?

Which nuclear fuels does a one solar mass star use over the course of its entire lifespan?

Star A is a 1 solar mass white dwarf, and star B is a 1.3 solar mass white dwarf. How would they differ?

What is the source of the energy radiated by a white dwarf?

What does the Chandrasekhar-Landau limit tell us?

What is the ultimate fate of our Sun?

Which scenario is most likely to happen when the Sun enters the red giant stage?

If the stars at the turnoff point of a cluster have a mass of 3 times the mass of the Sun, what is the age of the cluster?