Question 1

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

Accepted Answer

An elongated region should be

Question 2

____________________ can be used to determine the distance to a star when the spectrum of the star can be used to determine its spectral type and luminosity class.

Accepted Answer

Spectrosco

Question 3

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 4

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

Question 5

________ dwarfs are M dwarfs on the main sequence whereas _________ dwarfs are hot, dim, and not on the main sequence.

Accepted Answer

The answer of ________ dwarfs are M dwarfs on the...

Question 6

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 7

Stars on the main sequence with the greatest mass

Accepted Answer

A) are spectral type M stars. 
B) are spectral type O stars. 
C) are located at the bottom of the main sequence in the H-R diagram. 
D) have masses very similar to the Sun. 
E) are spectral type O stars and are located at the bottom of the main sequence in the H-R diagram. 
A) are spectral type M stars. 
B) are spectral type O stars. 
C) are located at the bottom of the main sequence in the H-R diagram. 
D) have masses very similar to the Sun. 
E) are spectral type O stars and are located at the bottom of the main sequence in the H-R diagram.

Question 8

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

Accepted Answer

A) True 
 B)False

Question 9

The largest of the red stars are the ____________________ stars.

Accepted Answer

The answer of The largest of the red stars are...

Question 10

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the

Accepted Answer

A) Lyman series. 
B) Balmer series. 
C) Paschen series. 
D) isotopes of hydrogen. 
E) ions of hydrogen. 
A) Lyman series. 
B) Balmer series. 
C) Paschen series. 
D) isotopes of hydrogen. 
E) ions of hydrogen.

Question 11

Consider a two-body system of the Earth orbiting the Sun. The center of mass would be located near the _________.

Accepted Answer

A) Sun 
B) Earth 
C) Moon 
D) midway point 
A) Sun 
B) Earth 
C) Moon 
D) midway point

Question 12

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element Why or why not

Accepted Answer

We cannot conclude this, becau

Question 13

The most common kinds of stars are low-luminosity stars.

Accepted Answer

A) True 
 B)False

Question 14

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature

Accepted Answer

The relationship among luminosity, radiu

Question 15

A G2 I star is ____________________ in diameter and ____________________ luminous than the Sun.

Accepted Answer

The answer of A G2 I star is ____________________ in...

Question 16

A ___________________ binary is shown in the following simulated spectra.

Accepted Answer

A) single-lined spectroscopic 
B) double-lined spectroscopic 
C) visual 
D) eclipsing 
A) single-lined spectroscopic 
B) double-lined spectroscopic 
C) visual 
D) eclipsing

Question 17

Which is the binary system, and what is the type, in the following figure

Accepted Answer

A) Alcor A and B, spectroscopic 
B) Alcor and Mizar, visual binary 
C) Mizar A and B, visual binary 
D) None of the other choices are correct. 
A) Alcor A and B, spectroscopic 
B) Alcor and Mizar, visual binary 
C) Mizar A and B, visual binary 
D) None of the other choices are correct.

Question 18

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 19

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K

Accepted Answer

A) There is no hydrogen in stars this hot. 
B) The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. 
C) These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. 
D) Stars of this temperature are too cool to produce an absorption spectrum. 
E) Stars of this temperature are too hot to produce an absorption spectrum. 
A) There is no hydrogen in stars this hot. 
B) The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. 
C) These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. 
D) Stars of this temperature are too cool to produce an absorption spectrum. 
E) Stars of this temperature are too hot to produce an absorption spectrum.

Question 20

_____ spectral type stars are hotter than _____ spectral type stars.

Accepted Answer

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

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

____________________ can be used to determine the distance to a star when the spectrum of the star can be used to determine its spectral type and luminosity class.

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

-Which star in Diagram 8-1 is most like the Sun

dwarfs are M dwarfs on the main sequence whereas _ dwarfs are hot, dim, and not on the main sequence.

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

Stars on the main sequence with the greatest mass

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

The largest of the red stars are the ____________________ stars.

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the

Consider a two-body system of the Earth orbiting the Sun. The center of mass would be located near the _________.

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element Why or why not

The most common kinds of stars are low-luminosity stars.

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature

A G2 I star is in diameter and luminous than the Sun.

A ___________________ binary is shown in the following simulated spectra.

Which is the binary system, and what is the type, in the following figure

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

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K

_ spectral type stars are hotter than _ spectral type stars.

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

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

____________________ can be used to determine the distance to a star when the spectrum of the star can be used to determine its spectral type and luminosity class.

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

-Which star in Diagram 8-1 is most like the Sun

________ dwarfs are M dwarfs on the main sequence whereas _________ dwarfs are hot, dim, and not on the main sequence.

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

Stars on the main sequence with the greatest mass

White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye.

The largest of the red stars are the ____________________ stars.

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the

Consider a two-body system of the Earth orbiting the Sun. The center of mass would be located near the _________.

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element Why or why not

The most common kinds of stars are low-luminosity stars.

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature

A G2 I star is ____________________ in diameter and ____________________ luminous than the Sun.

A ___________________ binary is shown in the following simulated spectra.

Which is the binary system, and what is the type, in the following figure

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

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K

_____ spectral type stars are hotter than _____ spectral type stars.

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

dwarfs are M dwarfs on the main sequence whereas _ dwarfs are hot, dim, and not on the main sequence.

A G2 I star is in diameter and luminous than the Sun.

_ spectral type stars are hotter than _ spectral type stars.