Question 1

Where on the Hertzsprung-Russell diagram do most local stars in our universe congregate?

Accepted Answer

A)   In the supergiant area,where the most massive stars spend a significant time
B)   In the giants area,where most stars spend the longest time of their lives
C)   In the white dwarf area,the "graveyard" of stars
D)   On the main sequence where stars are generating energy by fusion reactionsE) C) and D)
F) A) and B)

Question 2

Barnard's star,one of our nearest neighbors,is classified as M5 V.This means that it is a

Accepted Answer

A)   cool giant.
B)   hot main-sequence star.
C)   cool supergiant.
D)   a cool main-sequence star.E) None of the above
F) A) and D)

Question 3

The Sun's absolute magnitude is about +5.The brightest stars in our sky have absolute magnitudes of about -10.What is the luminosity of these stars compared to the Sun,assuming that they have similar spectral light distributions?

Accepted Answer

A)   1 million times larger
B)   5 times less
C)   1 million times smaller
D)   15 times greaterE) A) and C)
F) None of the above

Question 4

If you bring an object to half of the original distance,the apparent brightness will be 4 times as bright as before.

Accepted Answer

A) True 
 B)False

Question 5

Spectroscopic parallax is the process of finding the distance to a star by measuring its shift against the background stars over 6 months.

Accepted Answer

A) True 
 B)False

Question 6

Parallax is the

Accepted Answer

A)   distance to an object,measured in parsecs.
B)   angle subtended by an object,as seen by us.
C)   apparent shift in position of a nearby object as we move.
D)   shift in position of an object as it moves.E) A) and D)
F) A) and C)

Question 7

Red stars are hot and blue stars are cold.

Accepted Answer

A) True 
 B)False

Question 8

The Sun's spectrum peaks in the green region of the spectrum (i.e. ,green is the most intense color in its spectrum) .The spectrum of Rigel (the knee of Orion) peaks in the short wavelength end of the visible spectrum.Compared with the Sun,Rigel is

Accepted Answer

A)   cooler and redder.
B)   hotter and redder.
C)   cooler and whiter.
D)   hotter and whiter.E) None of the above
F) All of the above

Question 9

What is "metal" to an astronomer?

Accepted Answer

A)   Any element heavier than hydrogen
B)   Any element heavier than hydrogen or helium
C)   Any element in solid or liquid form that can conduct electricity easily
D)   Any elementE) None of the above
F) All of the above

Question 10

Two stars,one classified A4 V and the other F8 V,have the same apparent magnitude.There is no significant amount of absorption of starlight by interstellar material.From this information we know that

Accepted Answer

A)   the A4 V star is closer to the Sun than F8 V.
B)   the A4 V star is smaller than F8 V.
C)   the A4 V star is farther from the Sun than F8 V.
D)   both stars are at the same distance from Sun.E) A) and D)
F) B) and C)

Question 11

Which of the following four spectral luminosity classes would correspond to a red supergiant?

Accepted Answer

A)   B7 I
B)   G2 III
C)   M3 V
D)   M2 IE) B) and D)
F) A) and C)

Question 12

Which one of the following statements is correct for an isolated star (i.e. ,a star that is not in a binary star system) ?

Accepted Answer

A)   It is not possible to measure the star's mass accurately.
B)   There are several ways to measure its mass accurately.
C)   Its mass can be measured accurately only if its luminosity and temperature can be measured.
D)   Its mass can be measured accurately only if its distance can be found.E) None of the above
F) B) and C)

Question 13

A star of spectral class L is

Accepted Answer

A)   a red star,intermediate between spectral classes K and M.
B)   not a star at all,but a white dwarf.
C)   a yellow star like the Sun.
D)   not a star at all,but a brown dwarf.E) All of the above
F) B) and D)

Question 14

Astronomers measure the masses of stars by

Accepted Answer

A)   measuring the star's brightness,temperature,and distance.
B)   observing the star's brightness at different wavelengths (colors) .
C)   measuring the star's brightness and obtaining its radius using the H-R diagram.
D)   observing the motion of two stars in a binary star system.E) B) and C)
F) A) and D)

Question 15

A star with a parallax angle of 0.2 seconds of arc would be how many parsecs away?

Accepted Answer

A)   2 pc
B)   6.52 pc
C)   5 pc
D)   20 pcE) B) and C)
F) A) and D)

Question 16

If you triple the distance to a given star,the apparent brightness will be one-third as bright as before.

Accepted Answer

A) True 
 B)False

Question 17

A yellow star and a blue star are the same size and the same distance away from Earth,which one appears brighter in the sky?

Accepted Answer

A)   The yellow star
B)   The blue star
C)   They appear the same brightness.
D)   It is impossible to determine how bright they will appear.E) B) and C)
F) All of the above

Question 18

A star that is spectral class A is hotter than a star of spectral class O.

Accepted Answer

A) True 
 B)False

Question 19

Stars of spectral class B compared to stars of spectral class F are

Accepted Answer

A)   bigger.
B)   smaller.
C)   hotter.
D)   cooler.E) B) and D)
F) All of the above

Question 20

If Star A has an apparent magnitude of +5,and Star B has an apparent magnitude of +10,then

Accepted Answer

A)   Star A is twice as bright as Star B.
B)   Star B is twice as bright as Star A.
C)   Star A is 100 times as bright as Star B.
D)   Star B is 100 times as bright as Star A.E) B) and D)
F) C) and D)

Exam 10: Observing Properties of Distant Stars

A yellow star and a blue star are the same size and the same distance away from Earth,which one appears brighter in the sky?

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A star with a parallax angle of 0.2 seconds of arc would be how many parsecs away?

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Parallax is the

Correct AnswerverifiedShow Answer

Where on the Hertzsprung-Russell diagram do most local stars in our universe congregate?

Correct AnswerverifiedShow Answer

Barnard's star,one of our nearest neighbors,is classified as M5 V.This means that it is a

Correct AnswerverifiedShow Answer

Which one of the following statements is correct for an isolated star (i.e. ,a star that is not in a binary star system) ?

Correct AnswerverifiedShow Answer

The Sun's absolute magnitude is about +5.The brightest stars in our sky have absolute magnitudes of about -10.What is the luminosity of these stars compared to the Sun,assuming that they have similar spectral light distributions?

Correct AnswerverifiedShow Answer

Red stars are hot and blue stars are cold.

Correct AnswerverifiedShow Answer

Which of the following four spectral luminosity classes would correspond to a red supergiant?

Correct AnswerverifiedShow Answer

What is "metal" to an astronomer?

Correct AnswerverifiedShow Answer

Spectroscopic parallax is the process of finding the distance to a star by measuring its shift against the background stars over 6 months.

Correct AnswerverifiedShow Answer

A star that is spectral class A is hotter than a star of spectral class O.

Correct AnswerverifiedShow Answer

If you bring an object to half of the original distance,the apparent brightness will be 4 times as bright as before.

Correct AnswerverifiedShow Answer

Stars of spectral class B compared to stars of spectral class F are

Correct AnswerverifiedShow Answer

A star of spectral class L is

Correct AnswerverifiedShow Answer

If you triple the distance to a given star,the apparent brightness will be one-third as bright as before.

Correct AnswerverifiedShow Answer

Two stars,one classified A4 V and the other F8 V,have the same apparent magnitude.There is no significant amount of absorption of starlight by interstellar material.From this information we know that

Correct AnswerverifiedShow Answer

If Star A has an apparent magnitude of +5,and Star B has an apparent magnitude of +10,then

Correct AnswerverifiedShow Answer

Astronomers measure the masses of stars by

Correct AnswerverifiedShow Answer

The Sun's spectrum peaks in the green region of the spectrum (i.e. ,green is the most intense color in its spectrum) .The spectrum of Rigel (the knee of Orion) peaks in the short wavelength end of the visible spectrum.Compared with the Sun,Rigel is

Correct AnswerverifiedShow Answer

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