Question 1

In the evolution of massive stars, what is the significance of the temperature 600 million K?

Accepted Answer

A) It is the temperature at which helium fuses into carbon. 
B) It is the temperature needed for carbon fusing into heavier elements. 
C) It is the main sequence core temperature which makes massive stars so bright. 
D) It is the temperature needed for helium burning into boron. 
E) It is the final temperature reached during their evolution. 
A) It is the temperature at which helium fuses into carbon. 
B) It is the temperature needed for carbon fusing into heavier elements. 
C) It is the main sequence core temperature which makes massive stars so bright. 
D) It is the temperature needed for helium burning into boron. 
E) It is the final temperature reached during their evolution.

Question 2

The most famous case of a more massive hot star orbiting with a more evolved but presentlyless massive red giant is the eclipsing binary:

Accepted Answer

A) Aldebaran. 
B) Antares. 
C) Algol. 
D) Albireo. 
E) Altair. 
A) Aldebaran. 
B) Antares. 
C) Algol. 
D) Albireo. 
E) Altair.

Question 3

Mass transfer will almost always occur for spectroscopic and eclipsing binaries.

Accepted Answer

A) True 
 B)False

Question 4

What can disrupt the evolutionary sequence of a star?

Accepted Answer

If it is a member of a close b

Question 5

That brighter Sirius A weighs 3 solar masses, but the white dwarf Sirius B is only about onesolar mass implies:

Accepted Answer

A) that white dwarfs evolve slower than main sequence stars. 
B) that the collapsed companion transferred mass to Sirius A. 
C) that there should be a planetary nebula around the Sirius system. 
D) that Sirius A will be stable three times longer than Sirius B. 
E) the Sirius A will end up as a black hole, not a white dwarf like its companion. 
A) that white dwarfs evolve slower than main sequence stars. 
B) that the collapsed companion transferred mass to Sirius A. 
C) that there should be a planetary nebula around the Sirius system. 
D) that Sirius A will be stable three times longer than Sirius B. 
E) the Sirius A will end up as a black hole, not a white dwarf like its companion.

Question 6

What are at least three possible explanations for historical records indicating that Sirius wasred, even though it is now clearly seen as blue-white?

Accepted Answer

1)This could be an error in the records.

Question 7

Virtually all the carbon-rich dust in the plane of the galaxy originated in:

Accepted Answer

A) low-mass stars. 
B) high-mass stars. 
C) planetary nebulae. 
D) white dwarfs. 
E) brown dwarfs. 
A) low-mass stars. 
B) high-mass stars. 
C) planetary nebulae. 
D) white dwarfs. 
E) brown dwarfs.

Question 8

Which type of star has the strongest stellar winds?

Accepted Answer

A) giant K- and M-type stars 
B) white dwarfs 
C) dwarf K- and M-type stars 
D) main sequence O- and B-type stars 
E) T Tauri stars 
A) giant K- and M-type stars 
B) white dwarfs 
C) dwarf K- and M-type stars 
D) main sequence O- and B-type stars 
E) T Tauri stars

In the evolution of massive stars, what is the significance of the temperature 600 million K?

The most famous case of a more massive hot star orbiting with a more evolved but presentlyless massive red giant is the eclipsing binary:

Mass transfer will almost always occur for spectroscopic and eclipsing binaries.

What can disrupt the evolutionary sequence of a star?

That brighter Sirius A weighs 3 solar masses, but the white dwarf Sirius B is only about onesolar mass implies:

What are at least three possible explanations for historical records indicating that Sirius wasred, even though it is now clearly seen as blue-white?

Virtually all the carbon-rich dust in the plane of the galaxy originated in:

Which type of star has the strongest stellar winds?

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information From the Cosmos

Spectroscopy: the Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earths Sister Planet

Mars: a Near Miss for Life

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Gas and Dust Among the Stars

Star Formation: a Traumatic Birth

Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone

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Exam 20: Stellar Evolution: The Life and Death of a Star

In the evolution of massive stars, what is the significance of the temperature 600 million K?

The most famous case of a more massive hot star orbiting with a more evolved but presentlyless massive red giant is the eclipsing binary:

Mass transfer will almost always occur for spectroscopic and eclipsing binaries.

What can disrupt the evolutionary sequence of a star?

That brighter Sirius A weighs 3 solar masses, but the white dwarf Sirius B is only about onesolar mass implies:

What are at least three possible explanations for historical records indicating that Sirius wasred, even though it is now clearly seen as blue-white?

Virtually all the carbon-rich dust in the plane of the galaxy originated in:

Which type of star has the strongest stellar winds?

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information From the Cosmos

Spectroscopy: the Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earths Sister Planet

Mars: a Near Miss for Life

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Gas and Dust Among the Stars

Star Formation: a Traumatic Birth

Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone

Filters