Question 1

The distance to a star with a parallax angle of 0.2 arc seconds is

Accepted Answer

A)  0.2 parsec. 
B)  2 parsecs. 
C)  5 parsecs. 
D)  12 parsecs. 
E)  20 parsecs. 
A)  0.2 parsec. 
B)  2 parsecs. 
C)  5 parsecs. 
D)  12 parsecs. 
E)  20 parsecs. C

Question 2

Compare and contrast stars on the upper left and lower right of the main sequence.

Accepted Answer

Stars on the upper left are type O and B. They are hotter, more massive and luminous, have larger radii, are blue- white or white, and have relatively short lifetimes. The hottest, type O, have lines of ionized helium. Stars on the lower right are cooler, less massive and luminous, are smaller and redder, and have very long lifetimes. The coolest have molecular spectral lines.

Question 3

In the H- R diagram, what are the two most important types of data plotted?

Accepted Answer

A)  absolute and apparent magnitudes 
B)  spectral classes and absolute magnitudes 
C)  apparent magnitudes and temperatures 
D)  luminosities and masses 
E)  sizes and temperatures 
A)  absolute and apparent magnitudes 
B)  spectral classes and absolute magnitudes 
C)  apparent magnitudes and temperatures 
D)  luminosities and masses 
E)  sizes and temperatures B

Question 4

A unique characteristic of type O stars is ionized helium lines in its spectrum.

Accepted Answer

A) True 
 B)False

Question 5

Two stars both have parallaxes of 0.023", but star A has apparent magnitude +2.3, while star B is magnitude +7.3. Which statement is true?

Accepted Answer

A)  Star A is both 100× brighter and larger than star B. 
B)  Star B must be ten times more luminous. 
C)  Star A must be ten times closer. 
D)  Star A is both 100× brighter and more luminous than star B. 
E)  Nothing, since we do not know their absolute magnitudes. 
A)  Star A is both 100× brighter and larger than star B. 
B)  Star B must be ten times more luminous. 
C)  Star A must be ten times closer. 
D)  Star A is both 100× brighter and more luminous than star B. 
E)  Nothing, since we do not know their absolute magnitudes.

Question 6

On the H- R diagram, white dwarfs Sirius B and Procyon B lie

Accepted Answer

A)  at the top right. 
B)  close to the Sun, near the center. 
C)  at the lower left. 
D)  at the lower right. 
E)  at the top left. 
A)  at the top right. 
B)  close to the Sun, near the center. 
C)  at the lower left. 
D)  at the lower right. 
E)  at the top left.

Question 7

To find the _ velocity, we must combine proper motion and parallax data.

Accepted Answer

The answer of To find the _ velocity, we must...

Question 8

A star has a parallax of 0.01 arc seconds. Its distance is

Accepted Answer

A)  10 parsecs 
B)  100 parsecs. 
C)  1 parsec. 
D)  0.1 parsecs. 
E)  0.01 parsecs. 
A)  10 parsecs 
B)  100 parsecs. 
C)  1 parsec. 
D)  0.1 parsecs. 
E)  0.01 parsecs.

Question 9

Why is the main sequence main? Why are these stars so common?

Accepted Answer

While their masses, luminosities, and te

Question 10

In the M class stars, we find _ absorption lines not seen in hotter stars.

Accepted Answer

The answer of In the M class stars, we find...

Question 11

How can Betelgeuse be only half the Sun's surface temperature, yet about 10,000 times more luminous than the hotter Sun?

Accepted Answer

It may be cooler, but it is ab

Question 12

In addition to the proper motion, we also need the to find the transverse velocity of a star across our line of sight.

Accepted Answer

A)  temperature 
B)  parallax 
C)  composition 
D)  mass 
E)  color 
A)  temperature 
B)  parallax 
C)  composition 
D)  mass 
E)  color

Question 13

Which of these stars would be the hottest?

Accepted Answer

A)  M10 
B)  G2 
C)  B0 
D)  A0 
E)  K9 
A)  M10 
B)  G2 
C)  B0 
D)  A0 
E)  K9

Question 14

A star's absolute magnitude is its apparent brightness as seen from

Accepted Answer

A)  Alpha Centauri. 
B)  10 light- years distance. 
C)  Pluto. 
D)  100 parsecs distance. 
E)  10 parsecs distance. 
A)  Alpha Centauri. 
B)  10 light- years distance. 
C)  Pluto. 
D)  100 parsecs distance. 
E)  10 parsecs distance.

Question 15

The stars a Cygni and fi Cygni are in the constellation Cygnus. Which statement is true?

Accepted Answer

A)  a Cygni appears brighter. 
B)  fi is hotter. 
C)  fi Cygni appears brighter. 
D)  a must be the eastern most star in the constellation. 
E)  fi appears redder. 
A)  a Cygni appears brighter. 
B)  fi is hotter. 
C)  fi Cygni appears brighter. 
D)  a must be the eastern most star in the constellation. 
E)  fi appears redder.

Question 16

Stellar masses are measured directly by observations of the motions of

Accepted Answer

A)  eclipsing binary systems. 
B)  visual binary systems. 
C)  spectroscopic binary systems. 
D)  All of the above can give us their masses. 
E)  Stellar masses cannot be measured directly by any method. 
A)  eclipsing binary systems. 
B)  visual binary systems. 
C)  spectroscopic binary systems. 
D)  All of the above can give us their masses. 
E)  Stellar masses cannot be measured directly by any method.

Question 17

What role do molecules play in spectral classification?

Accepted Answer

Molecules can only f

Question 18

A type B star is bluer than a type G star.

Accepted Answer

A) True 
 B)False

Question 19

Binary stars separated enough to be resolved in a telescope are called

Accepted Answer

A)  line- of- sight binaries. 
B)  astrometric binaries. 
C)  spectroscopic binaries. 
D)  visual binaries. 
E)  orbital binaries. 
A)  line- of- sight binaries. 
B)  astrometric binaries. 
C)  spectroscopic binaries. 
D)  visual binaries. 
E)  orbital binaries.

Question 20

The ionized helium lines show up only in class stars.

Accepted Answer

A)  M 
B)  K 
C)  O 
D)  B 
E)  F 
A)  M 
B)  K 
C)  O 
D)  B 
E)  F

The distance to a star with a parallax angle of 0.2 arc seconds is

Compare and contrast stars on the upper left and lower right of the main sequence.

In the H- R diagram, what are the two most important types of data plotted?

A unique characteristic of type O stars is ionized helium lines in its spectrum.

Two stars both have parallaxes of 0.023", but star A has apparent magnitude +2.3, while star B is magnitude +7.3. Which statement is true?

On the H- R diagram, white dwarfs Sirius B and Procyon B lie

To find the _ velocity, we must combine proper motion and parallax data.

A star has a parallax of 0.01 arc seconds. Its distance is

Why is the main sequence main? Why are these stars so common?

In the M class stars, we find _ absorption lines not seen in hotter stars.

How can Betelgeuse be only half the Sun's surface temperature, yet about 10,000 times more luminous than the hotter Sun?

In addition to the proper motion, we also need the to find the transverse velocity of a star across our line of sight.

Which of these stars would be the hottest?

A star's absolute magnitude is its apparent brightness as seen from

The stars a Cygni and fi Cygni are in the constellation Cygnus. Which statement is true?

Stellar masses are measured directly by observations of the motions of

What role do molecules play in spectral classification?

A type B star is bluer than a type G star.

Binary stars separated enough to be resolved in a telescope are called

The ionized helium lines show up only in class 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

The distance to a star with a parallax angle of 0.2 arc seconds is

Compare and contrast stars on the upper left and lower right of the main sequence.

In the H- R diagram, what are the two most important types of data plotted?

A unique characteristic of type O stars is ionized helium lines in its spectrum.

Two stars both have parallaxes of 0.023", but star A has apparent magnitude +2.3, while star B is magnitude +7.3. Which statement is true?

On the H- R diagram, white dwarfs Sirius B and Procyon B lie

To find the _ velocity, we must combine proper motion and parallax data.

A star has a parallax of 0.01 arc seconds. Its distance is

Why is the main sequence main? Why are these stars so common?

In the M class stars, we find _ absorption lines not seen in hotter stars.

How can Betelgeuse be only half the Sun's surface temperature, yet about 10,000 times more luminous than the hotter Sun?

In addition to the proper motion, we also need the to find the transverse velocity of a star across our line of sight.

Which of these stars would be the hottest?

A star's absolute magnitude is its apparent brightness as seen from

The stars a Cygni and fi Cygni are in the constellation Cygnus. Which statement is true?

Stellar masses are measured directly by observations of the motions of

What role do molecules play in spectral classification?

A type B star is bluer than a type G star.

Binary stars separated enough to be resolved in a telescope are called

The ionized helium lines show up only in class 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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