Question 1

From the mass-luminosity relation, a 2-solar-mass star on the main sequence would have a luminosity of approximately ____ solar luminosities.

Accepted Answer

A)  2 
B)  4 
C)  11 
D)  0.5 
E)  0.25 
A)  2 
B)  4 
C)  11 
D)  0.5 
E)  0.25

Question 2

Why do molecular bands only occur in the spectra of the coolest stars?

Accepted Answer

Because molecules in cool star

Question 3

Barnard's star is 5.9 ly from Earth. Its parallax angle is 0.55". Note 1 pc is 3.26 ly and 1 ly is 63200 AU.

Accepted Answer

A) True 
 B)False

Question 4

The star Algol is

Accepted Answer

A)  an astrometric binary. 
B)  a spectroscopic binary. 
C)  a visual binary. 
D)  an eclipsing binary. 
E)  a spectroscopic binary and an eclipsing binary. 
A)  an astrometric binary. 
B)  a spectroscopic binary. 
C)  a visual binary. 
D)  an eclipsing binary. 
E)  a spectroscopic binary and an eclipsing binary.

Question 5

Ross 128 is 1.1 times further than Ross 154. As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154.

Accepted Answer

A) True 
 B)False

Question 6

Parallax would be easier to measure if

Accepted Answer

A)  Earth's orbit was larger. 
B)  the stars were farther away. 
C)  Earth moved faster along its orbit. 
D)  Earth's orbit was larger, the stars were further away, and Earth moved faster along its orbit. 
E)  None of the other choices are correct. 
A)  Earth's orbit was larger. 
B)  the stars were farther away. 
C)  Earth moved faster along its orbit. 
D)  Earth's orbit was larger, the stars were further away, and Earth moved faster along its orbit. 
E)  None of the other choices are correct.

Question 7

An M star is hotter than an O star.

Accepted Answer

A) True 
 B)False

Question 8

The location of a star in the H-R diagram indicates its temperature and intrinsic brightness.

Accepted Answer

A) True 
 B)False

Question 9

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

Question 10

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

Accepted Answer

Most stars are too distant to have measu

Question 11

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. 
A)  20 pc. 
B)  50 pc. 
C)  2 pc. 
D)  5 pc. 
E)  500 pc.

Question 12

The most massive main-sequence stars are the ________ spectral class and the ________ luminosity class.

Accepted Answer

The answer of The most massive main-sequence stars are the...

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

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

Accepted Answer

A) True 
 B)False

Question 15

When we see a binary system producing eclipses, we know that the orbit is nearly edge-on.

Accepted Answer

A) True 
 B)False

Question 16

The more massive a main-sequence star, the more ___________ it is, as found by the M-L relation.

Accepted Answer

The answer of The more massive a main-sequence star, the...

Question 17

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

Accepted Answer

Supergiants have very narrow s

Question 18

The mass-luminosity relation applies to both white dwarfs and main-sequence stars as both trace linear lines on the H-R diagram.

Accepted Answer

A) True 
 B)False

Question 19

Betelgeuse has an M V = -5 and 1000 times the radius of the Sun. Barnard's Star has an M V = 13.2 and 100 times smaller than the Sun. Therefore, we can determine that the stars have the same temperature.

Accepted Answer

A) True 
 B)False

Question 20

Five stars and their spectral types are given below. Which star would have the lowest surface temperature?

Accepted Answer

A)  α For; F8 
B)  ο Cet; M7 
C)  35 Ari; B3 
D)  γ Tri; A0 
E)  ξ Per; O7 
A)  α For; F8 
B)  ο Cet; M7 
C)  35 Ari; B3 
D)  γ Tri; A0 
E)  ξ Per; O7

From the mass-luminosity relation, a 2-solar-mass star on the main sequence would have a luminosity of approximately ____ solar luminosities.

Why do molecular bands only occur in the spectra of the coolest stars?

Barnard's star is 5.9 ly from Earth. Its parallax angle is 0.55". Note 1 pc is 3.26 ly and 1 ly is 63200 AU.

The star Algol is

Ross 128 is 1.1 times further than Ross 154. As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154.

Parallax would be easier to measure if

An M star is hotter than an O star.

The location of a star in the H-R diagram indicates its temperature and intrinsic brightness.

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

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

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

The most massive main-sequence stars are the spectral class and the luminosity class.

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

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

When we see a binary system producing eclipses, we know that the orbit is nearly edge-on.

The more massive a main-sequence star, the more ___________ it is, as found by the M-L relation.

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

The mass-luminosity relation applies to both white dwarfs and main-sequence stars as both trace linear lines on the H-R diagram.

Betelgeuse has an M _V = -5 and 1000 times the radius of the Sun. Barnard's Star has an M _V = 13.2 and 100 times smaller than the Sun. Therefore, we can determine that the stars have the same temperature.

Five stars and their spectral types are given below. Which star would have the lowest surface temperature?

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 8: The Family of Stars

From the mass-luminosity relation, a 2-solar-mass star on the main sequence would have a luminosity of approximately ____ solar luminosities.

Why do molecular bands only occur in the spectra of the coolest stars?

Barnard's star is 5.9 ly from Earth. Its parallax angle is 0.55". Note 1 pc is 3.26 ly and 1 ly is 63200 AU.

The star Algol is

Ross 128 is 1.1 times further than Ross 154. As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154.

Parallax would be easier to measure if

An M star is hotter than an O star.

The location of a star in the H-R diagram indicates its temperature and intrinsic brightness.

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

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

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

The most massive main-sequence stars are the ________ spectral class and the ________ luminosity class.

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

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

When we see a binary system producing eclipses, we know that the orbit is nearly edge-on.

The more massive a main-sequence star, the more ___________ it is, as found by the M-L relation.

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

The mass-luminosity relation applies to both white dwarfs and main-sequence stars as both trace linear lines on the H-R diagram.

Betelgeuse has an M V = -5 and 1000 times the radius of the Sun. Barnard's Star has an M V = 13.2 and 100 times smaller than the Sun. Therefore, we can determine that the stars have the same temperature.

Five stars and their spectral types are given below. Which star would have the lowest surface temperature?

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

The most massive main-sequence stars are the spectral class and the luminosity class.

Betelgeuse has an M _V = -5 and 1000 times the radius of the Sun. Barnard's Star has an M _V = 13.2 and 100 times smaller than the Sun. Therefore, we can determine that the stars have the same temperature.