Question 1

What role does hydrogen play in spectral classification?

Accepted Answer

It is most prominent

Question 2

A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun.

Accepted Answer

A) True 
 B)False

Question 3

Upon what data do measurements of sizes of eclipsing binaries depend?

Accepted Answer

A) their orbital periods and separations 
B) their masses and luminosities 
C) their Doppler shifts and durations of stages of their eclipses 
D) their temperatures and speeds 
E) their temperatures and masses 
A) their orbital periods and separations 
B) their masses and luminosities 
C) their Doppler shifts and durations of stages of their eclipses 
D) their temperatures and speeds 
E) their temperatures and masses

Question 4

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is:

Accepted Answer

A) .2". 
B) .5". 
C) .02". 
D) .002". 
E) .005". 
A) .2". 
B) .5". 
C) .02". 
D) .002". 
E) .005".

Question 5

In eclipsing binaries, in contrast to spectroscopic binaries, we can also determine a star's:

Accepted Answer

A) temperature. 
B) color. 
C) speed. 
D) shape. 
E) radius. 
A) temperature. 
B) color. 
C) speed. 
D) shape. 
E) radius.

Question 6

What role does helium play in spectral classification?

Accepted Answer

It is ionized in the hottest O

Question 7

What is proper motion? How is it related to transverse velocity?

Accepted Answer

Annual apparent motion of a st

Question 8

Gaia will be able to measure which two apparent motions of stars?

Accepted Answer

A) transverse and radial 
B) parallax and transverse 
C) radial and parallax 
D) parallax and orbital 
E) orbital and radial 
A) transverse and radial 
B) parallax and transverse 
C) radial and parallax 
D) parallax and orbital 
E) orbital and radial

Question 9

On the main sequence on an H-R diagram, our Sun lies at about ________.

Accepted Answer

The answer of On the main sequence on an H-R...

Question 10

In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximumsplit two nights later, its orbital period must be:

Accepted Answer

A) one day. 
B) two days. 
C) four days. 
D) eight days. 
E) twelve days. 
A) one day. 
B) two days. 
C) four days. 
D) eight days. 
E) twelve days.

Question 11

Star A has an absolute magnitude of 2.5 and star B has an apparent magnitude of 2.5, but starA is a main sequence star and star B is a red giant. Which statement below is correct?

Accepted Answer

A) Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B) Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C) Star A and star B appear to have the same brightness, but actually star B is brighter than starA. 
D) Star A and star B appear to have the same brightness, but actually star A is brighter than starB. 
E) It is impossible to determine how bright these stars are or appear to be relative to one another,given the information above. 
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B) Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C) Star A and star B appear to have the same brightness, but actually star B is brighter than starA. 
D) Star A and star B appear to have the same brightness, but actually star A is brighter than starB. 
E) It is impossible to determine how bright these stars are or appear to be relative to one another,given the information above.

Question 12

In general, the narrower the spectral line of a star:

Accepted Answer

A) the hotter the star is. 
B) the bigger the star is. 
C) the denser the star is. 
D) the smaller the star is. 
E) the cooler the star is. 
A) the hotter the star is. 
B) the bigger the star is. 
C) the denser the star is. 
D) the smaller the star is. 
E) the cooler the star is.

Question 13

If a star were moved 10 times farther away, its absolute magnitude would drop fivemagnitudes.

Accepted Answer

A) True 
 B)False

Question 14

What types of observations are necessary to determine the motion of a star through space?

Accepted Answer

To determine the true space motion of a

Question 15

The Hipparcos mission's data on parallaxes is useful for stellar distances out to about 200 pc.

Accepted Answer

A) True 
 B)False

Question 16

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

Accepted Answer

The answer of A star with a parallax of 1...

Question 17

Stars that have masses similar to the Sun's, and sizes similar to the Earth are:

Accepted Answer

A) main sequence stars. 
B) white dwarfs. 
C) red giants. 
D) red dwarfs. 
E) brown dwarfs. 
A) main sequence stars. 
B) white dwarfs. 
C) red giants. 
D) red dwarfs. 
E) brown dwarfs.

Question 18

Which of the following is the most common type of star?

Accepted Answer

A) high mass main sequence 
B) low mass main sequence 
C) white dwarfs 
D) red giants 
E) blue supergiants 
A) high mass main sequence 
B) low mass main sequence 
C) white dwarfs 
D) red giants 
E) blue supergiants

Question 19

Small stars are ________ common than large stars.

Accepted Answer

The answer of Small stars are ________ common than large...

Question 20

Describe the distance and composition of the Alpha Centauri system.

Accepted Answer

The Alpha Centauri system is composed of

Exam 17: The Stars: Giants, Dwarfs, and the Main Sequence

What role does hydrogen play in spectral classification?

A star of the Sun's diameter, but twice as hot, must be 16X more luminous than the Sun.

Upon what data do measurements of sizes of eclipsing binaries depend?

If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is:

In eclipsing binaries, in contrast to spectroscopic binaries, we can also determine a star's:

What role does helium play in spectral classification?

What is proper motion? How is it related to transverse velocity?

Gaia will be able to measure which two apparent motions of stars?

On the main sequence on an H-R diagram, our Sun lies at about ________.

In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximumsplit two nights later, its orbital period must be:

Star A has an absolute magnitude of 2.5 and star B has an apparent magnitude of 2.5, but starA is a main sequence star and star B is a red giant. Which statement below is correct?

In general, the narrower the spectral line of a star:

If a star were moved 10 times farther away, its absolute magnitude would drop fivemagnitudes.

What types of observations are necessary to determine the motion of a star through space?

The Hipparcos mission's data on parallaxes is useful for stellar distances out to about 200 pc.

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

Stars that have masses similar to the Sun's, and sizes similar to the Earth are:

Which of the following is the most common type of star?

Small stars are ________ common than large stars.

Describe the distance and composition of the Alpha Centauri system.

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information From the Cosmos

Spectroscopy: the Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earths Sister Planet

Mars: a Near Miss for Life

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Interstellar Medium: Gas and Dust Among the Stars

Star Formation: a Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone

Filters