Question 1

If we divide the mass of a star by its volume,we calculate the star's ____________________.

Accepted Answer

The answer of If we divide the mass of a...

Question 2

If a binary system has a period of 4 years and a separation of 5 AU,then the total mass is 7.8 solar masses.

Accepted Answer

A) True 
 B)False

Question 3

How does absolute visual magnitude tell us the intrinsic brightness of a star?

Accepted Answer

The answer of How does absolute visual magnitude tell us...

Question 4

If a star is twice as hot as the Sun and only half the Sun's diameter,it will be less luminous than the Sun.

Accepted Answer

A) True 
 B)False

Question 5

-The diagram illustrates two stars in a visual binary system and the centre of mass of this system.Based on this diagram,what is the ratio of the mass of star A to the mass of star B?

Accepted Answer

A) 2 to 1 
B) 1 to 2 
C) 2 to 3 
D) 3 to 2 
A) 2 to 1 
B) 1 to 2 
C) 2 to 3 
D) 3 to 2

Question 6

What property do most of the nearest stars in the sky share?

Accepted Answer

A) They have high temperatures. 
B) They are very luminous. 
C) They are main-sequence stars. 
D) They are red dwarfs. 
A) They have high temperatures. 
B) They are very luminous. 
C) They are main-sequence stars. 
D) They are red dwarfs.

Question 7

$$\begin{array} { | l | c | c | } 
\hline { \text { Star } } & \begin{array} { c } 
\text { Parallax } \
\text { (sec of arc) }
\end{array} & \begin{array} { c } 
\text { Spectral } \
\text { Type }
\end{array} \
\hline 5 \text { Cen } & 0.026 & \text { B2 IV } \
\hline \text { HR 4758 } & 0.05 & \text { G0 V } \
\hline \text { HD 39801 } & 0.005 & \text { M2 I } \
\hline 9 \mathrm { CMa } & 0.4 & \text { Al V } \
\hline
\end{array}$$
-Which star in the table has the largest diameter?

Accepted Answer

A) ? Cen 
B) HR 4758 
C) HD 39801 
D) 9 CMa 
A) ? Cen 
B) HR 4758 
C) HD 39801 
D) 9 CMa

Question 8

What is the most reliable way to measure the mass of a star for which the distance is known?

Accepted Answer

A) Apply the mass-luminosity relation. 
B) Measure its orbit around another star. 
C) Measure its radius, then compute its volume and multiply by density to get the mass. 
D) Apply the mass-temperature relation. 
A) Apply the mass-luminosity relation. 
B) Measure its orbit around another star. 
C) Measure its radius, then compute its volume and multiply by density to get the mass. 
D) Apply the mass-temperature relation.

Question 9

What type of stars are the most common?

Accepted Answer

A) supergiants 
B) giants 
C) upper (more luminous) main-sequence stars 
D) lower (less luminous) main-sequence stars 
A) supergiants 
B) giants 
C) upper (more luminous) main-sequence stars 
D) lower (less luminous) main-sequence stars

Question 10

Why is spectroscopy of binary stars such an important aspect of astronomy?

Accepted Answer

Spectroscopy of binary stars is an impor

Question 11

In what kind of type A star are the hydrogen lines narrowest?

Accepted Answer

A) supergiants 
B) main-sequence stars 
C) subgiants 
D) dwarfs 
A) supergiants 
B) main-sequence stars 
C) subgiants 
D) dwarfs

Question 12

On the H-R diagram,lines of constant radius slant downward from left to right.

Accepted Answer

A) True 
 B)False

Question 13

How does a star's surface temperature determine the appearance of its spectrum?

Accepted Answer

A) Surface temperature affects which elements are solid, liquid, or gaseous. 
B) Surface temperature determines the luminosity of the star. 
C) Surface temperature affects which elements can escape from the surface of the star. 
D) Surface temperature determines the velocity of collision rates of atoms and ions. 
A) Surface temperature affects which elements are solid, liquid, or gaseous. 
B) Surface temperature determines the luminosity of the star. 
C) Surface temperature affects which elements can escape from the surface of the star. 
D) Surface temperature determines the velocity of collision rates of atoms and ions.

Question 14

-Use the H-R diagram to answer the following question: Which star in the diagram has the largest absolute visual magnitude?

Accepted Answer

A) Antares 
B) Arcturus 
C) HR 5337 
D) Sirius B 
A) Antares 
B) Arcturus 
C) HR 5337 
D) Sirius B

Question 15

What aspect of a star is a measure of the total energy radiated by the star in one second?

Accepted Answer

A) apparent visual magnitude 
B) luminosity class 
C) spectral type 
D) luminosity 
A) apparent visual magnitude 
B) luminosity class 
C) spectral type 
D) luminosity

Question 16

-At what point in the eclipsing binary light curve below is the cooler star in front of the hotter star?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 17

Giant stars are members of luminosity class III.

Accepted Answer

A) True 
 B)False

Question 18

How do the spectra of giants,supergiants,and main-sequence stars differ?

Accepted Answer

The answer of How do the spectra of giants,supergiants,and main-sequence...

Question 19

To observe a visual binary,we must measure radial velocities.

Accepted Answer

A) True 
 B)False

Question 20

For what kinds of stars are the masses of stars in the H-R diagram "orderly"? For what kinds of stars are they "disorderly"? In other words,could you guess the mass of a star from its location (luminosity,temperature)on the H-R diagram?

Accepted Answer

The answer of For what kinds of stars are the...

If we divide the mass of a star by its volume,we calculate the star's ____________________.

If a binary system has a period of 4 years and a separation of 5 AU,then the total mass is 7.8 solar masses.

How does absolute visual magnitude tell us the intrinsic brightness of a star?

If a star is twice as hot as the Sun and only half the Sun's diameter,it will be less luminous than the Sun.

-The diagram illustrates two stars in a visual binary system and the centre of mass of this system.Based on this diagram,what is the ratio of the mass of star A to the mass of star B?

What property do most of the nearest stars in the sky share?

Star Parallax (sec of arc) Spectral Type 5 Cen 0.026 B2 IV HR 4758 0.05 G0 V HD 39801 0.005 M2 I 9 0.4 Al V -Which star in the table has the largest diameter?

What is the most reliable way to measure the mass of a star for which the distance is known?

What type of stars are the most common?

Why is spectroscopy of binary stars such an important aspect of astronomy?

In what kind of type A star are the hydrogen lines narrowest?

On the H-R diagram,lines of constant radius slant downward from left to right.

How does a star's surface temperature determine the appearance of its spectrum?

-Use the H-R diagram to answer the following question: Which star in the diagram has the largest absolute visual magnitude?

What aspect of a star is a measure of the total energy radiated by the star in one second?

-At what point in the eclipsing binary light curve below is the cooler star in front of the hotter star?

Giant stars are members of luminosity class III.

How do the spectra of giants,supergiants,and main-sequence stars differ?

To observe a visual binary,we must measure radial velocities.

For what kinds of stars are the masses of stars in the H-R diagram "orderly"? For what kinds of stars are they "disorderly"? In other words,could you guess the mass of a star from its location (luminosity,temperature)on the H-R diagram?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

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Exam 6: The Family of Stars

If we divide the mass of a star by its volume,we calculate the star's ____________________.

If a binary system has a period of 4 years and a separation of 5 AU,then the total mass is 7.8 solar masses.

How does absolute visual magnitude tell us the intrinsic brightness of a star?

If a star is twice as hot as the Sun and only half the Sun's diameter,it will be less luminous than the Sun.

-The diagram illustrates two stars in a visual binary system and the centre of mass of this system.Based on this diagram,what is the ratio of the mass of star A to the mass of star B?

What property do most of the nearest stars in the sky share?

Star Parallax (sec of arc) Spectral Type 5 Cen 0.026 B2 IV HR 4758 0.05 G0 V HD 39801 0.005 M2 I 9 0.4 Al V -Which star in the table has the largest diameter?

What is the most reliable way to measure the mass of a star for which the distance is known?

What type of stars are the most common?

Why is spectroscopy of binary stars such an important aspect of astronomy?

In what kind of type A star are the hydrogen lines narrowest?

On the H-R diagram,lines of constant radius slant downward from left to right.

How does a star's surface temperature determine the appearance of its spectrum?

-Use the H-R diagram to answer the following question: Which star in the diagram has the largest absolute visual magnitude?

What aspect of a star is a measure of the total energy radiated by the star in one second?

-At what point in the eclipsing binary light curve below is the cooler star in front of the hotter star?

Giant stars are members of luminosity class III.

How do the spectra of giants,supergiants,and main-sequence stars differ?

To observe a visual binary,we must measure radial velocities.

For what kinds of stars are the masses of stars in the H-R diagram "orderly"? For what kinds of stars are they "disorderly"? In other words,could you guess the mass of a star from its location (luminosity,temperature)on the H-R diagram?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters