Question 1

A star's luminosity depends only on the star's

Accepted Answer

A)   distance and diameter.
B)   temperature and distance.
C)   distance.
D)   temperature and diameter.
E)   apparent magnitude. D

Question 2

Of the three units of astronomical distances, _________ is shorter than _________, which is shorter than _________.

Accepted Answer

The answer of Of the three units of astronomical distances,...

Question 3

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

Accepted Answer

A) True 
 B)False

Question 4

What is the total mass of a binary star system with P = 20 yr and a = 10 AU?

Accepted Answer

A)   2 solar masses
B)   2.5 solar masses
C)   0.5 solar mass
D)   80 solar masses
E)   0.4 solar mass

Question 5

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the

Accepted Answer

A)   Lyman series.
B)   Balmer series.
C)   Paschen series.
D)   isotopes of hydrogen.
E)   ions of hydrogen. C

Question 6

Groombridge 34 is an M1 V star. Based on this information, which of the following are true?
I. Groombridge 34 has a surface temperature that is less than the Sun.
II. Groombridge 34 has a mass that is greater than that of the Sun.
III. Groombridge 34 is less luminous than the Sun.
IV. Groombridge 34 is located near the middle of the H-R diagram.

Accepted Answer

A)   I & II
B)   II & IV
C)   I & IV
D)   I & III
E)   II & III

Question 7

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element? Why or why not?

Accepted Answer

We cannot conclude this, becau...

Question 8

The amount of light received at Earth from a star is called luminosity.

Accepted Answer

A) True 
 B)False

Question 9

Consider a two-body system of the Earth orbiting the Sun. The center of mass would be located near the _________.

Accepted Answer

A)   Sun
B)   Earth
C)   Moon
D)   midway point

Question 10

The most common stars are

Accepted Answer

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

Question 11

If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?

Accepted Answer

A)   175,000 km
B)   350,000 km
C)   194 km
D)   700,000 km
E)   4656 km

Question 12

To observe a spectroscopic binary, we must be able to see both stars individually.

Accepted Answer

A) True 
 B)False

Question 13

Binary (double)  stars can be detected by

Accepted Answer

A)   being seen as two separate stars with a telescope.
B)   one star traveling a wiggly proper-motion path across the sky.
C)   one star dimming abruptly as another passes in front of it.
D)   pairs of absorption lines seen in the spectrum of what appears to be one star.
E)   All of the other choices are correct. E

Question 14

Based upon the information given in the above color photographs, what would you predict to see in a spectra class L0 color photo?

Accepted Answer

A)   mostly lines including hydrogen and helium
B)   mostly molecular bands such as iron hydride (FeH) 
C)   mostly lines including sodium and helium
D)   mostly molecular lines like H, He, Na

Question 15

Polaris is 10 times larger than Capella A and both are the same color. How much brighter or dimmer is Polaris to Capella?

Accepted Answer

A)   10 × brighter
B)   10 × dimmer
C)   100 × brighter
D)   100 × dimmer

Question 16

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

Accepted Answer

If a star is cool, there are few violent...

Question 17

You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?

Accepted Answer

A)   The star has to be in a visual binary.
B)   The star has to be in a spectroscopic binary.
C)   You need the star's luminosity.
D)   You need the star's absorption spectra.

Question 18

The concept the picture above is trying to get across is _______.

Accepted Answer

A)   intensity
B)   luminosity
C)   flux
D)   energy

Question 19

Why would parallaxes be easier to observe if Earth were farther from the Sun?

Accepted Answer

Then the baseline of...

Question 20

Describe the measurements needed to determine the orbit of a visual binary star.

Accepted Answer

Measure the positions of the t...

Exam 8: The Family of Stars

A star's luminosity depends only on the star's

Correct Answer
verified
D

Of the three units of astronomical distances, _____ is shorter than _, which is shorter than _____.

Correct Answer
verified

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

Correct Answer
verified

What is the total mass of a binary star system with P = 20 yr and a = 10 AU?

Correct Answer
verified

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the

Correct Answer
verified
C

Correct Answer
verified

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element? Why or why not?

Correct Answer
verified
We cannot conclude this, becau...
View Answer

The amount of light received at Earth from a star is called luminosity.

Correct Answer
verified

Consider a two-body system of the Earth orbiting the Sun. The center of mass would be located near the _________.

Correct Answer
verified

The most common stars are

Correct Answer
verified

If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?

Correct Answer
verified

To observe a spectroscopic binary, we must be able to see both stars individually.

Correct Answer
verified

Binary (double) stars can be detected by

Correct Answer
verified
E

Based upon the information given in the above color photographs, what would you predict to see in a spectra class L0 color photo?

Correct Answer
verified

Polaris is 10 times larger than Capella A and both are the same color. How much brighter or dimmer is Polaris to Capella?

Correct Answer
verified

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

Correct Answer
verified
If a star is cool, there are few violent...
View Answer

You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?

Correct Answer
verified

The concept the picture above is trying to get across is _______.

Correct Answer
verified

Why would parallaxes be easier to observe if Earth were farther from the Sun?

Correct Answer
verified
Then the baseline of...
View Answer

Describe the measurements needed to determine the orbit of a visual binary star.

Correct Answer
verified
Measure the positions of the t...
View Answer

Exam 8: The Family of Stars

A star's luminosity depends only on the star's

Correct AnswerverifiedD

Of the three units of astronomical distances, _________ is shorter than _________, which is shorter than _________.

Correct AnswerverifiedShow Answer

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

Correct AnswerverifiedShow Answer

What is the total mass of a binary star system with P = 20 yr and a = 10 AU?

Correct AnswerverifiedShow Answer

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element? Why or why not?

Correct AnswerverifiedWe cannot conclude this, becau...View AnswerShow Answer

The amount of light received at Earth from a star is called luminosity.

Correct AnswerverifiedShow Answer

Consider a two-body system of the Earth orbiting the Sun. The center of mass would be located near the _________.

Correct AnswerverifiedShow Answer

The most common stars are

Correct AnswerverifiedShow Answer

If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?

Correct AnswerverifiedShow Answer

To observe a spectroscopic binary, we must be able to see both stars individually.

Correct AnswerverifiedShow Answer

Binary (double) stars can be detected by

Correct AnswerverifiedE

Based upon the information given in the above color photographs, what would you predict to see in a spectra class L0 color photo?

Correct AnswerverifiedShow Answer

Polaris is 10 times larger than Capella A and both are the same color. How much brighter or dimmer is Polaris to Capella?

Correct AnswerverifiedShow Answer

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

Correct AnswerverifiedIf a star is cool, there are few violent...View AnswerShow Answer

You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?

Correct AnswerverifiedShow Answer

The concept the picture above is trying to get across is _______.

Correct AnswerverifiedShow Answer

Why would parallaxes be easier to observe if Earth were farther from the Sun?

Correct AnswerverifiedThen the baseline of...View AnswerShow Answer

Describe the measurements needed to determine the orbit of a visual binary star.

Correct AnswerverifiedMeasure the positions of the t...View AnswerShow Answer

Correct Answer
verified
D

Of the three units of astronomical distances, _____ is shorter than _, which is shorter than _____.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
We cannot conclude this, becau...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
If a star is cool, there are few violent...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Then the baseline of...
View Answer

Correct Answer
verified
Measure the positions of the t...
View Answer