Question 1

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

Accepted Answer

The answer of For stars on the main sequence, the...

Question 2

The correct sequence of spectral type letters from hot on the left to cool on the right is

Accepted Answer

A)   M, K, G, F, A, B, O
B)   O, B, A, F, G, K, M
C)   G, K, M, F, O, B, A
D)   A, B, O, F, G, K, M

Question 3

Table 8-1
Use the chart below to answer the following question(s) .
 
-From the data given, which star in Table 8-1 is the closest to Earth?

Accepted Answer

A)   65 Tau
B)   HR 4621
C)   ( α\alphaα  Pic) 
D)   58 Ori
E)   HR 2491

Question 4

In the H-R diagram, 90 percent of all stars are

Accepted Answer

A)   in the giant region.
B)   in the supergiant region.
C)   among the B stars.
D)   among the G stars.
E)   on the main sequence.

Question 5

Giant stars are members of luminosity class III.

Accepted Answer

A) True 
 B)False

Question 6

An M star is hotter than an O star.

Accepted Answer

A) True 
 B)False

Question 7

If you compare two stars,

Accepted Answer

A)   the one with the larger radius will always have the greater luminosity.
B)   the one with the higher surface temperature will always have the greater luminosity.
C)   the one with the smaller absolute magnitude will always have the greater luminosity.
D)   the one with the larger surface area has the greater energy flux from its surface.

Question 8

The most accurate way to determine the surface temperature of a star is to study

Accepted Answer

A)   the pattern of absorption lines from various atoms.
B)   the relative intensities of light measured through different photometric filters.
C)   the peak wavelength of the star's continuous blackbody spectrum.
D)   pattern of emission lines that are on the star's spectrum.

Question 9

How does density divide the stars in the H-R diagram into three groups?

Accepted Answer

The answer of How does density divide the stars in...

Question 10

How do absolute visual magnitude and luminosity differ?

Accepted Answer

The answer of How do absolute visual magnitude and luminosity...

Question 11

Table 8-1
Use the chart below to answer the following question(s) .
 
-From the data given,, which star in Table 8-1 has the greatest luminosity?

Accepted Answer

A)   65 Tau
B)   HR 4621
C)   ( α\alphaα Pic) 
D)   58 Ori
E)   HR 2491

Question 12

The star named Sheat is of M2 II spectral type and luminosity class. Based on this information, which of the following are true?

Accepted Answer

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

Question 13

The mass of a visual binary pair of stars can be obtained from

Accepted Answer

A)   the time in years for them to orbit one another.
B)   the size of their orbit.
C)   their apparent magnitudes.
D)   both A and B

Question 14

Vega is an A0 V star. Based on this information, which of the following are true?

Accepted Answer

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

Question 15

The densest stars in the H-R diagram are the white dwarfs.

Accepted Answer

A) True 
 B)False

Question 16

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

Accepted Answer

A) True 
 B)False

Question 17

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.

Question 18

If two stars are emitting the same amount of light, the star that is farther will appear

Accepted Answer

A)   brighter.
B)   dimmer.
C)   redder.
D)   bluer.
E)   They will have the same brightness as seen from Earth.

Question 19

A star's apparent magnitude is a measure of ...

Accepted Answer

A)   how bright it appears to us if it is at its actual distance.
B)   how bright it appears to us at a standard distance of 10 pc.
C)   its energy output per second compared to the sun.
D)   its mass in solar masses.
E)   its surface temperature in Kelvin.

Question 20

Diagram 8-1
Use the H-R diagram below to answer the following question(s) . 
-Which star in Diagram 8-1 is most like the sun?

Accepted Answer

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

Exam 8: The Family of Stars

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

Correct Answer
verified

The most accurate way to determine the surface temperature of a star is to study

Correct Answer
verified

An M star is hotter than an O star.

Correct Answer
verified

If you compare two stars,

Correct Answer
verified

The densest stars in the H-R diagram are the white dwarfs.

Correct Answer
verified

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

Correct Answer
verified

The correct sequence of spectral type letters from hot on the left to cool on the right is

Correct Answer
verified

If two stars are emitting the same amount of light, the star that is farther will appear

Correct Answer
verified

In the H-R diagram, 90 percent of all stars are

Correct Answer
verified

Giant stars are members of luminosity class III.

Correct Answer
verified

A star's apparent magnitude is a measure of ...

Correct Answer
verified

How does density divide the stars in the H-R diagram into three groups?

Correct Answer
verified

Correct Answer
verified

How do absolute visual magnitude and luminosity differ?

Correct Answer
verified

Vega is an A0 V star. Based on this information, which of the following are true?

Correct Answer
verified

Correct Answer
verified

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

Correct Answer
verified

The mass of a visual binary pair of stars can be obtained from

Correct Answer
verified

The star named Sheat is of M2 II spectral type and luminosity class. Based on this information, which of the following are true?

Correct Answer
verified

Diagram 8-1 Use the H-R diagram below to answer the following question(s) . -Which star in Diagram 8-1 is most like the sun?

Correct Answer
verified

Exam 8: The Family of Stars

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

Correct AnswerverifiedShow Answer

The most accurate way to determine the surface temperature of a star is to study

Correct AnswerverifiedShow Answer

An M star is hotter than an O star.

Correct AnswerverifiedShow Answer

If you compare two stars,

Correct AnswerverifiedShow Answer

The densest stars in the H-R diagram are the white dwarfs.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The correct sequence of spectral type letters from hot on the left to cool on the right is

Correct AnswerverifiedShow Answer

If two stars are emitting the same amount of light, the star that is farther will appear

Correct AnswerverifiedShow Answer

In the H-R diagram, 90 percent of all stars are

Correct AnswerverifiedShow Answer

Giant stars are members of luminosity class III.

Correct AnswerverifiedShow Answer

A star's apparent magnitude is a measure of ...

Correct AnswerverifiedShow Answer

How does density divide the stars in the H-R diagram into three groups?

Correct AnswerverifiedShow Answer

Table 8-1 Use the chart below to answer the following question(s) . -From the data given,, which star in Table 8-1 has the greatest luminosity?

Correct AnswerverifiedShow Answer

How do absolute visual magnitude and luminosity differ?

Correct AnswerverifiedShow Answer

Vega is an A0 V star. Based on this information, which of the following are true?

Correct AnswerverifiedShow Answer

Table 8-1 Use the chart below to answer the following question(s) . -From the data given, which star in Table 8-1 is the closest to Earth?

Correct AnswerverifiedShow Answer

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

Correct AnswerverifiedShow Answer

The mass of a visual binary pair of stars can be obtained from

Correct AnswerverifiedShow Answer

The star named Sheat is of M2 II spectral type and luminosity class. Based on this information, which of the following are true?

Correct AnswerverifiedShow Answer

Diagram 8-1 Use the H-R diagram below to answer the following question(s) . -Which star in Diagram 8-1 is most like the sun?

Correct AnswerverifiedShow Answer

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