Question 1

In general, what can be said about type O and B stars compared to type K and M stars?

Accepted Answer

A)  They are hotter and younger. 
B)  They are cooler and older. 
C)  They are hotter and older. 
D)  They are cooler and younger. 
E)  They are neither hotter nor cooler, younger nor older. 
A)  They are hotter and younger. 
B)  They are cooler and older. 
C)  They are hotter and older. 
D)  They are cooler and younger. 
E)  They are neither hotter nor cooler, younger nor older.

Question 2

Almost all stars on the main sequence range from 1 to 10 solar luminosities.

Accepted Answer

A) True 
 B)False

Question 3

On a night when a human eye can see a fourth magnitude star, a 60mm telescope, with 100× the surface area as our pupil, would be able to just barely detect

Accepted Answer

A)  eleventh magnitude Tethys, Saturn's second largest moon. 
B)  seventh magnitude Titan, Saturn's largest moon. 
C)  ninth magnitude Barnard's Star. 
D)  eighth magnitude Uranus. 
E)  thirteenth magnitude Pluto. 
A)  eleventh magnitude Tethys, Saturn's second largest moon. 
B)  seventh magnitude Titan, Saturn's largest moon. 
C)  ninth magnitude Barnard's Star. 
D)  eighth magnitude Uranus. 
E)  thirteenth magnitude Pluto.

Question 4

A +6.0 magnitude star is brighter than a +3.0 magnitude star.

Accepted Answer

A) True 
 B)False

Question 5

The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of _ .

Accepted Answer

100X, or a

Question 6

How did the Hipparcos mission revolutionize our knowledge of stellar properties?

Accepted Answer

In space, it had far better resolution t

Question 7

What information can be gained from the light curves of eclipsing binaries?

Accepted Answer

A)  their masses 
B)  their luminosities 
C)  their sizes 
D)  their distances 
E)  their temperatures 
A)  their masses 
B)  their luminosities 
C)  their sizes 
D)  their distances 
E)  their temperatures

Question 8

The main difference between an A2V and F2V star is their .

Accepted Answer

temperatur

Question 9

A star with an apparent magnitude of +2.3 and an absolute magnitude of +5.9 lies than 10 parsecs away.

Accepted Answer

The answer of A star with an apparent magnitude of...

Question 10

Why is hydrogen less obvious in B stars than in A class?

Accepted Answer

Above 10,000K, the h

Question 11

Only A type stars show hydrogen lines in their spectra.

Accepted Answer

A) True 
 B)False

Question 12

The magnitude of a star depends on its luminosity and distance from us.

Accepted Answer

The answer of The magnitude of a star depends on...

Question 13

A parsec is about 3.3 light- years.

Accepted Answer

A) True 
 B)False

Question 14

A parsec is slightly more than 200,000 AU.

Accepted Answer

A) True 
 B)False

Question 15

What role does helium play in spectral classification?

Accepted Answer

It is ionized in the hottest O

Question 16

Ionized helium lines are found in both type B and O stars.

Accepted Answer

A) True 
 B)False

Question 17

White dwarfs like Sirius B are typically the size of _ .

Accepted Answer

The answer of White dwarfs like Sirius B are typically...

Question 18

If Vega is apparent magnitude zero, and Deneb first magnitude, then

Accepted Answer

A)  Vega must be 2.5× hotter than Deneb. 
B)  Deneb must be a main sequence star, and Vega a giant. 
C)  Vega is about 100× brighter than Deneb. 
D)  Deneb is one magnitude brighter than Vega. 
E)  Vega is 2.5× brighter than Deneb. 
A)  Vega must be 2.5× hotter than Deneb. 
B)  Deneb must be a main sequence star, and Vega a giant. 
C)  Vega is about 100× brighter than Deneb. 
D)  Deneb is one magnitude brighter than Vega. 
E)  Vega is 2.5× brighter than Deneb.

Question 19

Rigel has an apparent magnitude of + 0.18 and Betelgeuse an apparent magnitude of +0.45. What can you conclude from this?

Accepted Answer

A)  Rigel is brighter than Betelgeuse. 
B)  Betelgeuse must be closer to Earth. 
C)  Betelgeuse is brighter than Rigel. 
D)  Rigel must be closer to Earth. 
E)  Both stars are brighter than the full moon. 
A)  Rigel is brighter than Betelgeuse. 
B)  Betelgeuse must be closer to Earth. 
C)  Betelgeuse is brighter than Rigel. 
D)  Rigel must be closer to Earth. 
E)  Both stars are brighter than the full moon.

Question 20

What special type of information is yielded only by eclipsing binary stars?

Accepted Answer

The analysis of the light curve of eclip

In general, what can be said about type O and B stars compared to type K and M stars?

Almost all stars on the main sequence range from 1 to 10 solar luminosities.

On a night when a human eye can see a fourth magnitude star, a 60mm telescope, with 100× the surface area as our pupil, would be able to just barely detect

A +6.0 magnitude star is brighter than a +3.0 magnitude star.

The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of _ .

How did the Hipparcos mission revolutionize our knowledge of stellar properties?

What information can be gained from the light curves of eclipsing binaries?

The main difference between an A2V and F2V star is their .

A star with an apparent magnitude of +2.3 and an absolute magnitude of +5.9 lies than 10 parsecs away.

Why is hydrogen less obvious in B stars than in A class?

Only A type stars show hydrogen lines in their spectra.

The magnitude of a star depends on its luminosity and distance from us.

A parsec is about 3.3 light- years.

A parsec is slightly more than 200,000 AU.

What role does helium play in spectral classification?

Ionized helium lines are found in both type B and O stars.

White dwarfs like Sirius B are typically the size of _ .

If Vega is apparent magnitude zero, and Deneb first magnitude, then

Rigel has an apparent magnitude of + 0.18 and Betelgeuse an apparent magnitude of +0.45. What can you conclude from this?

What special type of information is yielded only by eclipsing binary stars?

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

The Interstellar Medium: Star Formation in the Milky Way

Stellar Evolution: the Lives and Deaths of Stars

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Normal and Active Galaxies: Building Blocks of the Universe

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

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Exam 11: Measuring the Stars: Giants, Dwarfs, and the Main Sequence

In general, what can be said about type O and B stars compared to type K and M stars?

Almost all stars on the main sequence range from 1 to 10 solar luminosities.

On a night when a human eye can see a fourth magnitude star, a 60mm telescope, with 100× the surface area as our pupil, would be able to just barely detect

A +6.0 magnitude star is brighter than a +3.0 magnitude star.

The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of _ .

How did the Hipparcos mission revolutionize our knowledge of stellar properties?

What information can be gained from the light curves of eclipsing binaries?

The main difference between an A2V and F2V star is their .

A star with an apparent magnitude of +2.3 and an absolute magnitude of +5.9 lies than 10 parsecs away.

Why is hydrogen less obvious in B stars than in A class?

Only A type stars show hydrogen lines in their spectra.

The magnitude of a star depends on its luminosity and distance from us.

A parsec is about 3.3 light- years.

A parsec is slightly more than 200,000 AU.

What role does helium play in spectral classification?

Ionized helium lines are found in both type B and O stars.

White dwarfs like Sirius B are typically the size of _ .

If Vega is apparent magnitude zero, and Deneb first magnitude, then

Rigel has an apparent magnitude of + 0.18 and Betelgeuse an apparent magnitude of +0.45. What can you conclude from this?

What special type of information is yielded only by eclipsing binary stars?

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

Telescopes: the Tools of Astronomy

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

The Interstellar Medium: Star Formation in the Milky Way

Stellar Evolution: the Lives and Deaths of Stars

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Normal and Active Galaxies: Building Blocks of the Universe

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

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