Question 1

If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses.

Accepted Answer

A) True 
 B)False

Question 2

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

Accepted Answer

The answer of For stars on the main sequence, the...

Question 3

The larger variation in brightness of a partially eclipsing system consisting of a B2 main-sequence star and an M2 main-sequence star occurs when the B2 star passes in front of the M2 star.

Accepted Answer

A) True 
 B)False

Question 4

How do absolute visual magnitude and luminosity differ?

Accepted Answer

Absolute visual magnitude of a star is t

Question 5

If you hold out your thumb at arm's length and rapidly blink each eye closed in an alternating pattern, your thumb appears to move left and right. This exercise is an example of _____________.

Accepted Answer

The answer of If you hold out your thumb at...

Question 6

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 other choices are correct. 
A)  TiO molecules. 
B)  ionized helium. 
C)  helium. 
D)  hydrogen. 
E)  All of the other choices are correct.

Question 7

If a star is located at 10 pc, which of the following statements is correct?

Accepted Answer

A)  The star's apparent and absolute visual magnitudes are equal. 
B)  The star's apparent and absolute visual magnitudes are 0. 
C)  The star's apparent visual magnitude is --1.1 whereas the absolute visual magnitude is -5. 
D)  Two of the other choices are correct. 
A)  The star's apparent and absolute visual magnitudes are equal. 
B)  The star's apparent and absolute visual magnitudes are 0. 
C)  The star's apparent visual magnitude is --1.1 whereas the absolute visual magnitude is -5. 
D)  Two of the other choices are correct.

Question 8

How does density divide the stars in the H-R diagram into three groups?

Accepted Answer

Density divides stars into thr

Question 9

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?

Accepted Answer

A)  There is no hydrogen in stars this cool. 
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 hydrogen atoms 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 cool. 
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 hydrogen atoms 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 10

On the H-R diagram below, indicate the location of the white dwarf stars.

Accepted Answer

An elongated region should be

Question 11

Absolute visual magnitude is

Accepted Answer

A)  the apparent magnitude of a star observed from Earth. 
B)  the luminosity of a star observed from a distance of 1000 pc. 
C)  the apparent magnitude of a star observed from a distance of 10 pc. 
D)  the luminosity of a star observed from Earth. 
E)  the apparent magnitude of a star observed from a distance of 10 pc and the luminosity of a star observed from Earth. 
A)  the apparent magnitude of a star observed from Earth. 
B)  the luminosity of a star observed from a distance of 1000 pc. 
C)  the apparent magnitude of a star observed from a distance of 10 pc. 
D)  the luminosity of a star observed from Earth. 
E)  the apparent magnitude of a star observed from a distance of 10 pc and the luminosity of a star observed from Earth.

Question 12

What information can we get from eclipsing binaries that we cannot get from visual binaries?

Accepted Answer

​ Because the orbital plane of

Question 13

Diagram 8-1 Use the H-R diagram below to answer the following question(s).  
Which star in Diagram 8-1 has the greatest surface temperature?

Accepted Answer

A)  Alnilam 
B)  Antares 
C)  Arcturus 
D)  HR 5337 
E)  Sirius B 
A)  Alnilam 
B)  Antares 
C)  Arcturus 
D)  HR 5337 
E)  Sirius B

Question 14

We can determine the surface temperature of a star from

Accepted Answer

A)  studying its continuous spectrum. 
B)  studying its line absorption spectrum. 
C)  measuring the star's luminosity. 
D)  studying its continuous spectrum and measuring the star's luminosity. 
E)  studying its continuous spectrum, studying its line absorption spectrum, and measuring the star's luminosity. 
A)  studying its continuous spectrum. 
B)  studying its line absorption spectrum. 
C)  measuring the star's luminosity. 
D)  studying its continuous spectrum and measuring the star's luminosity. 
E)  studying its continuous spectrum, studying its line absorption spectrum, and measuring the star's luminosity.

Question 15

The most massive main-sequence stars are the M stars.

Accepted Answer

A) True 
 B)False

Question 16

The best sample of the true numbers of the different types of stars consists of

Accepted Answer

A)  stars that appear brightest in the sky to an observer on Earth. 
B)  all of the stars within our solar system. 
C)  all the stars within a given distance from Earth. 
A)  stars that appear brightest in the sky to an observer on Earth. 
B)  all of the stars within our solar system. 
C)  all the stars within a given distance from Earth.

Question 17

Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0. What is the distance to Proxima Centauri in units of pc?

Accepted Answer

A)  0.1 
B)  100.1 
C)  10-0.1 
D)  None of the other choices are correct. 
A)  0.1 
B)  100.1 
C)  10-0.1 
D)  None of the other choices are correct.

Question 18

The parallax angle of the Sun is 1 arc second.

Accepted Answer

A) True 
 B)False

Question 19

Stellar parallax is used to measure distances of celestial bodies within the solar system.

Accepted Answer

A) True 
 B)False

Question 20

Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________

Accepted Answer

The answer of Below is a radial velocity curve for...

If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses.

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

The larger variation in brightness of a partially eclipsing system consisting of a B2 main-sequence star and an M2 main-sequence star occurs when the B2 star passes in front of the M2 star.

How do absolute visual magnitude and luminosity differ?

If you hold out your thumb at arm's length and rapidly blink each eye closed in an alternating pattern, your thumb appears to move left and right. This exercise is an example of _____________.

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

If a star is located at 10 pc, which of the following statements is correct?

How does density divide the stars in the H-R diagram into three groups?

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?

On the H-R diagram below, indicate the location of the white dwarf stars.

Absolute visual magnitude is

What information can we get from eclipsing binaries that we cannot get from visual binaries?

Diagram 8-1 Use the H-R diagram below to answer the following question(s). Which star in Diagram 8-1 has the greatest surface temperature?

We can determine the surface temperature of a star from

The most massive main-sequence stars are the M stars.

The best sample of the true numbers of the different types of stars consists of

Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0. What is the distance to Proxima Centauri in units of pc?

The parallax angle of the Sun is 1 arc second.

Stellar parallax is used to measure distances of celestial bodies within the solar system.

Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________

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

If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses.

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

The larger variation in brightness of a partially eclipsing system consisting of a B2 main-sequence star and an M2 main-sequence star occurs when the B2 star passes in front of the M2 star.

How do absolute visual magnitude and luminosity differ?

If you hold out your thumb at arm's length and rapidly blink each eye closed in an alternating pattern, your thumb appears to move left and right. This exercise is an example of _____________.

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

If a star is located at 10 pc, which of the following statements is correct?

How does density divide the stars in the H-R diagram into three groups?

Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?

On the H-R diagram below, indicate the location of the white dwarf stars.

Absolute visual magnitude is

What information can we get from eclipsing binaries that we cannot get from visual binaries?

Diagram 8-1 Use the H-R diagram below to answer the following question(s). Which star in Diagram 8-1 has the greatest surface temperature?

We can determine the surface temperature of a star from

The most massive main-sequence stars are the M stars.

The best sample of the true numbers of the different types of stars consists of

Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0. What is the distance to Proxima Centauri in units of pc?

The parallax angle of the Sun is 1 arc second.

Stellar parallax is used to measure distances of celestial bodies within the solar system.

Below is a radial velocity curve for a spectroscopic binary. Which of the stars is most massive? ____________________

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