Question 1

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 2

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 3

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

Accepted Answer

A) True 
 B)False

Question 4

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 5

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

Accepted Answer

A) True 
 B)False

Question 6

Stars of spectra type K have strong Balmer lines.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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

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

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. 
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.

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

Supergiants are about as common as the sun.

Accepted Answer

A) True 
 B)False

Question 13

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 14

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

Question 15

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)  ($\delta$Cen) 
B)  HR 4607 
C)  HR 4758 
D)  HD 39801 
E)  9 CMa 
A)  ($\delta$Cen) 
B)  HR 4607 
C)  HR 4758 
D)  HD 39801 
E)  9 CMa

Question 16

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

Accepted Answer

A)  ($\alpha$ For; F8) 
B)  (o Cet; M7) 
C)  35 Ari; B3 
D)  ($\gamma$ Tri; A0) 
E)  (  Per; O7) 
A)  ($\alpha$ For; F8) 
B)  (o Cet; M7) 
C)  35 Ari; B3 
D)  ($\gamma$ Tri; A0) 
E)  (  Per; O7)

Question 17

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

Question 18

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. 
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.

Question 19

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. 
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.

Question 20

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...

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

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

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

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

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

Stars of spectra type K have strong Balmer lines.

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

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?

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

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

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

Supergiants are about as common as the sun.

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

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

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

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

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

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

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

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

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

The Origin of the Solar System

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

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

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

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

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

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

Stars of spectra type K have strong Balmer lines.

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

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?

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

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

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

Supergiants are about as common as the sun.

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

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

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

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

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

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

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

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

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

The Origin of the Solar System

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