Question 1

A star's luminosity depends only on the star's

Accepted Answer

A)  distance and diameter. 
B)  temperature and distance. 
C)  distance. 
D)  temperature and diameter. 
E)  apparent magnitude. 
A)  distance and diameter. 
B)  temperature and distance. 
C)  distance. 
D)  temperature and diameter. 
E)  apparent magnitude. D

Question 2

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. C

Question 3

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 other choices are correct. 
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 other choices are correct. E

Question 4

Of the three units of astronomical distances, _________ is shorter than _________, which is shorter than _________.

Accepted Answer

The answer of Of the three units of astronomical distances,...

Question 5

The amount of light received at Earth from a star is called luminosity.

Accepted Answer

A) True 
 B)False

Question 6

What is the total mass of a binary star system with P = 20 yr and a = 10 AU?

Accepted Answer

A)  2 solar masses 
B)  2.5 solar masses 
C)  0.5 solar mass 
D)  80 solar masses 
E)  0.4 solar mass 
A)  2 solar masses 
B)  2.5 solar masses 
C)  0.5 solar mass 
D)  80 solar masses 
E)  0.4 solar mass

Question 7

Groombridge 34 is an M1 V star. Based on this information, which of the following are true?
I. Groombridge 34 has a surface temperature that is less than the Sun.
II. Groombridge 34 has a mass that is greater than that of the Sun.
III. Groombridge 34 is less luminous than the Sun.
IV. Groombridge 34 is located near the middle of the H-R diagram.

Accepted Answer

A)  I & II 
B)  II & IV 
C)  I & IV 
D)  I & III 
E)  II & III 
A)  I & II 
B)  II & IV 
C)  I & IV 
D)  I & III 
E)  II & III

Question 8

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 9

Based upon the information given in the above color photographs, what would you predict to see in a spectra class L0 color photo?

Accepted Answer

A)  mostly lines including hydrogen and helium 
B)  mostly molecular bands such as iron hydride (FeH) 
C)  mostly lines including sodium and helium 
D)  mostly molecular lines like H, He, Na 
A)  mostly lines including hydrogen and helium 
B)  mostly molecular bands such as iron hydride (FeH) 
C)  mostly lines including sodium and helium 
D)  mostly molecular lines like H, He, Na

Question 10

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

Accepted Answer

Then the baseline of

Question 11

Polaris is 10 times larger than Capella A and both are the same color. How much brighter or dimmer is Polaris to Capella?

Accepted Answer

A)  10 × brighter 
B)  10 × dimmer 
C)  100 × brighter 
D)  100 × dimmer 
A)  10 × brighter 
B)  10 × dimmer 
C)  100 × brighter 
D)  100 × dimmer

Question 12

To observe a spectroscopic binary, we must be able to see both stars individually.

Accepted Answer

A) True 
 B)False

Question 13

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 14

You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?

Accepted Answer

A)  The star has to be in a visual binary. 
B)  The star has to be in a spectroscopic binary. 
C)  You need the star's luminosity. 
D)  You need the star's absorption spectra. 
A)  The star has to be in a visual binary. 
B)  The star has to be in a spectroscopic binary. 
C)  You need the star's luminosity. 
D)  You need the star's absorption spectra.

Question 15

The concept the picture above is trying to get across is _______.

Accepted Answer

A)  intensity 
B)  luminosity 
C)  flux 
D)  energy 
A)  intensity 
B)  luminosity 
C)  flux 
D)  energy

Question 16

Describe the measurements needed to determine the orbit of a visual binary star.

Accepted Answer

Measure the positions of the t

Question 17

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 18

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

Accepted Answer

If a star is cool, there are few violent

Question 19

The most common stars are

Accepted Answer

A)  supergiants. 
B)  giants. 
C)  upper (more luminous) main-sequence stars. 
D)  white dwarfs. 
E)  lower (less luminous) main-sequence stars. 
A)  supergiants. 
B)  giants. 
C)  upper (more luminous) main-sequence stars. 
D)  white dwarfs. 
E)  lower (less luminous) main-sequence stars.

Question 20

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

Accepted Answer

A) True 
 B)False

A star's luminosity depends only on the star's

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

Binary (double) stars can be detected by

Of the three units of astronomical distances, _____ is shorter than _, which is shorter than _____.

The amount of light received at Earth from a star is called luminosity.

What is the total mass of a binary star system with P = 20 yr and a = 10 AU?

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

Based upon the information given in the above color photographs, what would you predict to see in a spectra class L0 color photo?

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

Polaris is 10 times larger than Capella A and both are the same color. How much brighter or dimmer is Polaris to Capella?

To observe a spectroscopic binary, we must be able to see both stars individually.

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?

You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?

The concept the picture above is trying to get across is _______.

Describe the measurements needed to determine the orbit of a visual binary star.

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?

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

The most common stars are

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

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

Origin of the Solar System and Extrasolar Planets

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

A star's luminosity depends only on the star's

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

Binary (double) stars can be detected by

Of the three units of astronomical distances, _________ is shorter than _________, which is shorter than _________.

The amount of light received at Earth from a star is called luminosity.

What is the total mass of a binary star system with P = 20 yr and a = 10 AU?

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

Based upon the information given in the above color photographs, what would you predict to see in a spectra class L0 color photo?

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

Polaris is 10 times larger than Capella A and both are the same color. How much brighter or dimmer is Polaris to Capella?

To observe a spectroscopic binary, we must be able to see both stars individually.

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?

You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?

The concept the picture above is trying to get across is _______.

Describe the measurements needed to determine the orbit of a visual binary star.

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?

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

The most common stars are

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc.

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

Origin of the Solar System and Extrasolar Planets

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

Of the three units of astronomical distances, _____ is shorter than _, which is shorter than _____.