Question 1

Most of our knowledge of evolutionary tracks comes from stars found in ________.

Accepted Answer

The answer of Most of our knowledge of evolutionary tracks...

Question 2

What can disrupt the evolutionary sequence of a star?

Accepted Answer

If it is a member of a close b

Question 3

The region in the H-R Diagram where evolved,low mass stars are converting helium to carbon in their cores is the ________.

Accepted Answer

The answer of The region in the H-R Diagram where...

Question 4

The shell ejection in making a planetary is spherical and symmetrical in all cases.

Accepted Answer

A) True 
 B)False

Question 5

What element are most white dwarfs primarily made of? Why?

Accepted Answer

They consist largely of carbon,for it is

Question 6

The thermonuclear process in high mass stars that produces one atom of helium from four of hydrogen is the ________.

Accepted Answer

The answer of The thermonuclear process in high mass stars...

Question 7

What is a planetary nebula?

Accepted Answer

A)  the bipolar jets ejected by a T Tauri variable 
B)  a planet surrounded by a glowing shell of gas 
C)  the disk of gas and dust surrounding a young star that will soon form a solar system 
D)  the ejected envelope, often bipolar, of a red giant surrounding a stellar core remnant 
E)  a type of young, medium mass star 
A)  the bipolar jets ejected by a T Tauri variable 
B)  a planet surrounded by a glowing shell of gas 
C)  the disk of gas and dust surrounding a young star that will soon form a solar system 
D)  the ejected envelope, often bipolar, of a red giant surrounding a stellar core remnant 
E)  a type of young, medium mass star

Question 8

The matter in white dwarfs is about a million times denser than matter around you,since you have packed the mass of the Sun into the volume of our Earth.

Accepted Answer

A) True 
 B)False

Question 9

The brightest stars of a young open cluster will be:

Accepted Answer

A)  Cepheid variables. 
B)  massive blue main sequence stars. 
C)  red giants. 
D)  yellow main sequence stars like the Sun. 
E)  T Tauri variables. 
A)  Cepheid variables. 
B)  massive blue main sequence stars. 
C)  red giants. 
D)  yellow main sequence stars like the Sun. 
E)  T Tauri variables.

Question 10

What spectral type of star that is still around formed most recently?

Accepted Answer

A)  O 
B)  A 
C)  F 
D)  K 
E)  M 
A)  O 
B)  A 
C)  F 
D)  K 
E)  M

Question 11

Which is used observationally to determine the age of a star cluster?

Accepted Answer

A)  the total number of main sequence stars 
B)  the ratio of giants to supergiants 
C)  the luminosity of the main sequence turn-off point 
D)  the number of white dwarfs 
E)  the amount of dust that lies around the cluster 
A)  the total number of main sequence stars 
B)  the ratio of giants to supergiants 
C)  the luminosity of the main sequence turn-off point 
D)  the number of white dwarfs 
E)  the amount of dust that lies around the cluster

Question 12

Some globular clusters have three main sequence tracks.This indicates:

Accepted Answer

A)  three different stellar compositions. 
B)  three episodes of star formation, separated by billions of years. 
C)  stars evolve through three different mechanisms. 
D)  the stars were observed from three different telescopes. 
A)  three different stellar compositions. 
B)  three episodes of star formation, separated by billions of years. 
C)  stars evolve through three different mechanisms. 
D)  the stars were observed from three different telescopes.

Question 13

The Roche lobe of a star in a binary star system:

Accepted Answer

A)  resembles the ear of Edouard Roche, a French mathematician. 
B)  is, in terms of the star's gravity, its "zone of influence." 
C)  is the part of a rapidly rotating star that will eventually spin away to form planets. 
D)  is the accretion disk around the companion star. 
E)  leads to formation of rings, like around the jovian planets. 
A)  resembles the ear of Edouard Roche, a French mathematician. 
B)  is, in terms of the star's gravity, its "zone of influence." 
C)  is the part of a rapidly rotating star that will eventually spin away to form planets. 
D)  is the accretion disk around the companion star. 
E)  leads to formation of rings, like around the jovian planets.

Question 14

A star cluster of age 100 million years contains no type O stars.

Accepted Answer

A) True 
 B)False

Question 15

During various stages of evolution,low mass stars (like the Sun)differ significantly from high mass stars.How and why are the main sequence lifetimes different?

Accepted Answer

High mass stars burn out quick

Question 16

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

Question 17

The thermonuclear process in solar and less massive stars which produces one atom of helium from four of hydrogen is the ________.

Accepted Answer

The answer of The thermonuclear process in solar and less...

Question 18

What is a typical age for a globular cluster?

Accepted Answer

A)  10 million years 
B)  200 million years 
C)  one billion years 
D)  4.8 billion years 
E)  12 billion years 
A)  10 million years 
B)  200 million years 
C)  one billion years 
D)  4.8 billion years 
E)  12 billion years

Question 19

The Sun will get brighter in the next 4 to 5 billion years.

Accepted Answer

A) True 
 B)False

Question 20

You observe a low-mass helium white dwarf.What can you conclude?

Accepted Answer

A)  It is over 100 billion years old. 
B)  It will soon be a planetary nebula. 
C)  It is part of a binary star system. 
D)  Its core is mostly carbon. 
E)  It was once a blue supergiant. 
A)  It is over 100 billion years old. 
B)  It will soon be a planetary nebula. 
C)  It is part of a binary star system. 
D)  Its core is mostly carbon. 
E)  It was once a blue supergiant.

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

Most of our knowledge of evolutionary tracks comes from stars found in ________.

What can disrupt the evolutionary sequence of a star?

The region in the H-R Diagram where evolved,low mass stars are converting helium to carbon in their cores is the ________.

The shell ejection in making a planetary is spherical and symmetrical in all cases.

What element are most white dwarfs primarily made of? Why?

The thermonuclear process in high mass stars that produces one atom of helium from four of hydrogen is the ________.

What is a planetary nebula?

The matter in white dwarfs is about a million times denser than matter around you,since you have packed the mass of the Sun into the volume of our Earth.

The brightest stars of a young open cluster will be:

What spectral type of star that is still around formed most recently?

Which is used observationally to determine the age of a star cluster?

Some globular clusters have three main sequence tracks.This indicates:

The Roche lobe of a star in a binary star system:

A star cluster of age 100 million years contains no type O stars.

During various stages of evolution,low mass stars (like the Sun)differ significantly from high mass stars.How and why are the main sequence lifetimes different?

Which type of star has the strongest stellar winds?

The thermonuclear process in solar and less massive stars which produces one atom of helium from four of hydrogen is the ________.

What is a typical age for a globular cluster?

The Sun will get brighter in the next 4 to 5 billion years.

You observe a low-mass helium white dwarf.What can you conclude?

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: Earth's 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