Question 1

If a star has a parallax of 0.02 seconds of arc, then its distance is

Accepted Answer

A)   20 pc.
B)   50 pc.
C)   2 pc.
D)   5 pc.
E)   500 pc.F) A) and E)
G) All of the above

Question 2

We know that giant stars are larger in diameter than the sun because

Accepted Answer

A)   they are more luminous but have about the same temperature.
B)   they are less luminous but have about the same temperature.
C)   they are hotter but have about the same luminosity.
D)   they are cooler but have about the same luminosity.
E)   they have a larger absolute magnitude than the sun.F) D) and E)
G) A) and C)

Question 3

How can we tell that some stars are relatively close to us in the sky?

Accepted Answer

A)   Some stars are occasionally eclipsed by the moon, so they must be nearby.
B)   Some stars vary in brightness caused by sunspots we can see because they are so close.
C)   Some stars appear to be extremely bright and must therefore be very close to us.
D)   Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the sun.E) A) and B)
F) A) and D)

Question 4

The Lyman series lines of hydrogen all lie in the infrared.

Accepted Answer

A) True 
 B)False

Question 5

Table 8-2
Use the chart below to answer the following question(s) .
 
-Which star in Table 8-2 has the greatest surface temperature?

Accepted Answer

A)   ( δ\deltaδ Cen) 
B)   HR 4607
C)   HR 4758
D)   HD 39801
E)   9 CMa F) A) and B)
G) A) and D)

Question 6

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 7

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ____ of its individual stars.

Accepted Answer

A)   the masses
B)   the sizes
C)   both a and b
D)   neither a nor bE) C) and D)
F) A) and D)

Question 8

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 massF) A) and B)
G) A) and E)

Question 9

On the H-R diagram below, indicate the location of the white dwarf stars.

Accepted Answer

An elongated region should be ...

Question 10

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 kmF) D) and E)
G) C) and D)

Question 11

The spectral types for each of five stars are given. Which star in would have the greatest surface temperature?

Accepted Answer

A)   ( α\alphaα  For; F8) 
B)   (o Cet; M7) 
C)   35 Ari; B3
D)   ( γ\gammaγ  Tri; A0) 
E)   ( Per; O7)  F) A) and D)
G) A) and C)

Question 12

The more massive star in a binary system is always farthest from the center of mass.

Accepted Answer

A) True 
 B)False

Question 13

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

Accepted Answer

A) True 
 B)False

Question 14

Stars of spectra type K have strong Balmer lines.

Accepted Answer

A) True 
 B)False

Question 15

The masses and diameters of each star in a binary can be determined from ____________________ binaries.

Accepted Answer

The answer of The masses and diameters of each star...

Question 16

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

Accepted Answer

The answer of How do the spectra of giants, supergiants,...

Question 17

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

Accepted Answer

A) True 
 B)False

Question 18

The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because

Accepted Answer

A)   we can't measure the radial velocities of each star in the system.
B)   we can't see the shape or tilt of the orbit.
C)   we can't find the diameters of the stars.
D)   we can't determine the luminosities of the stars.
E)   the Doppler shift is not measurable.F) None of the above
G) A) and D)

Question 19

How can we find the distance to a star that is too distant to have a measurable parallax?

Accepted Answer

The answer of How can we find the distance to...

Question 20

Supergiants are about as common as the sun.

Accepted Answer

A) True 
 B)False

Exam 8: The Family of Stars

The Lyman series lines of hydrogen all lie in the infrared.

Correct Answer
verified

We know that giant stars are larger in diameter than the sun because

Correct Answer
verified

If a star has a parallax of 0.02 seconds of arc, then its distance is

Correct Answer
verified

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

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

Correct Answer
verified

Supergiants are about as common as the sun.

Correct Answer
verified

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ____ of its individual stars.

Correct Answer
verified

The spectral types for each of five stars are given. Which star in would have the greatest surface temperature?

Correct Answer
verified

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

Correct Answer
verified

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

Correct Answer
verified

The masses and diameters of each star in a binary can be determined from ____________________ binaries.

Correct Answer
verified

The more massive star in a binary system is always farthest from the center of mass.

Correct Answer
verified

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

Correct Answer
verified

On the H-R diagram below, indicate the location of the white dwarf stars.

Correct Answer
verified
An elongated region should be ...
View Answer

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

Correct Answer
verified

Stars of spectra type K have strong Balmer lines.

Correct Answer
verified

The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because

Correct Answer
verified

How can we tell that some stars are relatively close to us in the sky?

Correct Answer
verified

How can we find the distance to a star that is too distant to have a measurable parallax?

Correct Answer
verified

Exam 8: The Family of Stars

The Lyman series lines of hydrogen all lie in the infrared.

Correct AnswerverifiedShow Answer

We know that giant stars are larger in diameter than the sun because

Correct AnswerverifiedShow Answer

If a star has a parallax of 0.02 seconds of arc, then its distance is

Correct AnswerverifiedShow Answer

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

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

Table 8-2 Use the chart below to answer the following question(s) . -Which star in Table 8-2 has the greatest surface temperature?

Correct AnswerverifiedShow Answer

Supergiants are about as common as the sun.

Correct AnswerverifiedShow Answer

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ____ of its individual stars.

Correct AnswerverifiedShow Answer

The spectral types for each of five stars are given. Which star in would have the greatest surface temperature?

Correct AnswerverifiedShow Answer

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The masses and diameters of each star in a binary can be determined from ____________________ binaries.

Correct AnswerverifiedShow Answer

The more massive star in a binary system is always farthest from the center of mass.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

On the H-R diagram below, indicate the location of the white dwarf stars.

Correct AnswerverifiedAn elongated region should be ...View AnswerShow Answer

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

Correct AnswerverifiedShow Answer

Stars of spectra type K have strong Balmer lines.

Correct AnswerverifiedShow Answer

The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because

Correct AnswerverifiedShow Answer

How can we tell that some stars are relatively close to us in the sky?

Correct AnswerverifiedShow Answer

How can we find the distance to a star that is too distant to have a measurable parallax?

Correct AnswerverifiedShow Answer

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An elongated region should be ...
View Answer

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