Question 1

If a star is twice as hot as the sun and only half the sun's diameter, it will be less luminous than the sun.

Accepted Answer

A) True 
 B)False  False

Question 2

The absorption lines in the ultraviolet 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. A

Question 3

Luminosity class IV objects are known as ____________________.

Accepted Answer

subgiants

Question 4

What is the most common kind of star? What measurements must be made to discover this information?

Accepted Answer

The most common kind of star in the univ

Question 5

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)  all of these 
E)  none of these 
A)  Earth's orbit was larger. 
B)  the stars were farther away. 
C)  Earth moved faster along its orbit. 
D)  all of these 
E)  none of these

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

An eclipsing binary will

Accepted Answer

A)  be more luminous than a visual binary. 
B)  also be observed as a spectroscopic binary. 
C)  give off most of its light in the infrared. 
D)  show a constant Doppler shift in its spectral lines. 
E)  show two stars with variable proper motion. 
A)  be more luminous than a visual binary. 
B)  also be observed as a spectroscopic binary. 
C)  give off most of its light in the infrared. 
D)  show a constant Doppler shift in its spectral lines. 
E)  show two stars with variable proper motion.

Question 8

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Accepted Answer

A)  the stars are in an elliptical orbit around one another. 
B)  the mass of the pair can be estimated. 
C)  one star is passing by the other never to return. 
D)  both A and B 
A)  the stars are in an elliptical orbit around one another. 
B)  the mass of the pair can be estimated. 
C)  one star is passing by the other never to return. 
D)  both A and B

Question 9

Spectroscopic and eclipse duration observations of an eclipsing 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 10

Which are the most common stars, massive stars or low-mass stars (relative to the sun)? High luminosity or low luminosity (relative to the sun)?

Accepted Answer

The most common stars in the universe ar

Question 11

Binary (double) stars can be detected by

Accepted Answer

A)  being seen as two separate stars with a telescope. 
B)  one star traveling a wiggly proper-motion path across the sky. 
C)  one star dimming abruptly as another passes in front of it. 
D)  pairs of absorption lines seen in the spectrum of what appears to be one star. 
E)  all of the above. 
A)  being seen as two separate stars with a telescope. 
B)  one star traveling a wiggly proper-motion path across the sky. 
C)  one star dimming abruptly as another passes in front of it. 
D)  pairs of absorption lines seen in the spectrum of what appears to be one star. 
E)  all of the above.

Question 12

Why would parallaxes be easier to observe if Earth were farther from the sun?

Accepted Answer

Parallax is the apparent shift in positi

Question 13

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 14

Two stars of the same spectral class must have the same

Accepted Answer

A)  radius. 
B)  temperature. 
C)  mass. 
D)  distance. 
E)  all of the above. 
A)  radius. 
B)  temperature. 
C)  mass. 
D)  distance. 
E)  all of the above.

Question 15

Explain why the presence of spectral lines of a given element in the solar spectrum tells us that element is present in the sun, but the absence of the lines would not mean the element was absent from the sun?

Accepted Answer

The presence of spectral lines of a give

Question 16

The spectra of the coolest stars contain strong absorption features (or lines) of

Accepted Answer

A)  TiO molecules. 
B)  ionized helium. 
C)  helium. 
D)  hydrogen. 
E)  all of the above. 
A)  TiO molecules. 
B)  ionized helium. 
C)  helium. 
D)  hydrogen. 
E)  all of the above.

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

Which one of the methods below enables astronomers to measure the distance of a star near the sun in our galaxy?

Accepted Answer

A)  sound echoes knowing the speed of sound and time 
B)  parallax using Earth's orbit 
C)  human binocular vision 
D)  Balmer series 
E)  none of the above 
A)  sound echoes knowing the speed of sound and time 
B)  parallax using Earth's orbit 
C)  human binocular vision 
D)  Balmer series 
E)  none of the above

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

Accepted Answer

The answer of What measurements are needed to determine the...

If a star is twice as hot as the sun and only half the sun's diameter, it will be less luminous than the sun.

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

Luminosity class IV objects are known as ____________________.

What is the most common kind of star? What measurements must be made to discover this information?

Parallax would be easier to measure if

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

An eclipsing binary will

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Spectroscopic and eclipse duration observations of an eclipsing binary star can enable astronomers to calculate____ of its individual stars.

Which are the most common stars, massive stars or low-mass stars (relative to the sun)? High luminosity or low luminosity (relative to the sun)?

Binary (double) stars can be detected by

Why would parallaxes be easier to observe if Earth were farther from the sun?

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

Two stars of the same spectral class must have the same

Explain why the presence of spectral lines of a given element in the solar spectrum tells us that element is present in the sun, but the absence of the lines would not mean the element was absent from the sun?

The spectra of the coolest stars contain strong absorption features (or lines) of

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

Which one of the methods below enables astronomers to measure the distance of a star near the sun in our galaxy?

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

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

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

If a star is twice as hot as the sun and only half the sun's diameter, it will be less luminous than the sun.

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

Luminosity class IV objects are known as ____________________.

What is the most common kind of star? What measurements must be made to discover this information?

Parallax would be easier to measure if

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

An eclipsing binary will

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Spectroscopic and eclipse duration observations of an eclipsing binary star can enable astronomers to calculate____ of its individual stars.

Which are the most common stars, massive stars or low-mass stars (relative to the sun)? High luminosity or low luminosity (relative to the sun)?

Binary (double) stars can be detected by

Why would parallaxes be easier to observe if Earth were farther from the sun?

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

Two stars of the same spectral class must have the same

Explain why the presence of spectral lines of a given element in the solar spectrum tells us that element is present in the sun, but the absence of the lines would not mean the element was absent from the sun?

The spectra of the coolest stars contain strong absorption features (or lines) of

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

Which one of the methods below enables astronomers to measure the distance of a star near the sun in our galaxy?

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

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

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