Question 1

Describe two methods that could be used to determine the temperature of a star.

Accepted Answer

The Balmer thermometer is a method of de

Question 2

Vega is an A0 V star. Based on this information, which of the following are true?
I. Vega has a surface temperature less than the Sun.
II. Vega has a mass that is greater than that of the Sun.
III. Vega is more luminous than the Sun.
IV. Vega is located in the upper left-hand corner in the H-R diagram.

Accepted Answer

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

Question 3

The absorption lines in the visible 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.

Question 4

On the H-R diagram, lines of constant radius slants down from left to right.

Accepted Answer

A) True 
 B)False

Question 5

Luminosity class IV objects are known as ____________________.

Accepted Answer

The answer of Luminosity class IV objects are known as...

Question 6

Most stars on the H-R diagram are on the ____________________.

Accepted Answer

The answer of Most stars on the H-R diagram are...

Question 7

To determine the orbital period of a visual binary, we must measure

Accepted Answer

A)  brightness. 
B)  position on the sky. 
C)  wavelengths. 
D)  luminosity. 
E)  temperature. 
A)  brightness. 
B)  position on the sky. 
C)  wavelengths. 
D)  luminosity. 
E)  temperature.

Question 8

A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a , of 1 AU with an orbital period, P , of 1 year. What is the mass of the pair of stars?

Accepted Answer

A)  1 solar masses 
B)  2 solar masses 
C)  4 solar masses 
D)  8 solar masses 
E)  16 solar masses 
A)  1 solar masses 
B)  2 solar masses 
C)  4 solar masses 
D)  8 solar masses 
E)  16 solar masses

Question 9

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

Accepted Answer

A) True 
 B)False

Question 10

The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct?

Accepted Answer

A)  Star A is twice the mass of star B. 
B)  Star B is twice the mass of star A. 
C)  Star A is ten times the mass of star B. 
D)  Star B is ten times the mass of star A. 
E)  Star A and Star B have the same mass. 
A)  Star A is twice the mass of star B. 
B)  Star B is twice the mass of star A. 
C)  Star A is ten times the mass of star B. 
D)  Star B is ten times the mass of star A. 
E)  Star A and Star B have the same mass.

Question 11

a  
B  
C
Predict the next panel in the spectral sequence of the binary star system shown above.

Accepted Answer

A)  a 
B)  c 
C)  b 
D)  None of the other choices are correct. 
A)  a 
B)  c 
C)  b 
D)  None of the other choices are correct.

Question 12

The least massive main-sequence stars have a/an _____ luminosity class and a/an _____ spectral class.

Accepted Answer

The answer of The least massive main-sequence stars have a/an...

Question 13

How is a luminosity class assigned to a star?

Accepted Answer

A)  by combining the apparent magnitude with the star's parallax 
B)  by measuring the period of variability in the star's apparent magnitude 
C)  by studying the absorption line width in the spectrum of the star 
D)  by observing the angular size of the star's image in a photograph or digital image 
A)  by combining the apparent magnitude with the star's parallax 
B)  by measuring the period of variability in the star's apparent magnitude 
C)  by studying the absorption line width in the spectrum of the star 
D)  by observing the angular size of the star's image in a photograph or digital image

Question 14

How does the luminosity depend on temperature for stars of the same size?

Accepted Answer

The relationship among luminosity, radiu

Question 15

How can we be certain that white dwarfs are very small?

Accepted Answer

White dwarfs lie in the lower

Question 16

If a star's apparent visual magnitude is equal to its absolute visual magnitude, how far is the star located from Earth?

Accepted Answer

A)  0 pc 
B)  1 pc 
C)  10 pc 
D)  100 pc 
A)  0 pc 
B)  1 pc 
C)  10 pc 
D)  100 pc

Question 17

How do humans use their eyes to measure relative distance by parallax?

Accepted Answer

A)  By continuously focusing our eyes on distant objects, we can determine distance. 
B)  Since our eyes are separated, the brain interprets the relative look angles of these eyes in terms of distance to the object viewed. 
C)  Our eyes can measure the time it takes light to travel from an object and from this we get distance. 
D)  By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed. 
A)  By continuously focusing our eyes on distant objects, we can determine distance. 
B)  Since our eyes are separated, the brain interprets the relative look angles of these eyes in terms of distance to the object viewed. 
C)  Our eyes can measure the time it takes light to travel from an object and from this we get distance. 
D)  By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed.

Question 18

Which is the binary system, and what is the type, in the above figure?

Accepted Answer

A)  Alcor A and B, spectroscopic 
B)  Alcor and Mizar, visual binary 
C)  Mizar A and B, visual binary 
D)  None of the other choices are correct. 
A)  Alcor A and B, spectroscopic 
B)  Alcor and Mizar, visual binary 
C)  Mizar A and B, visual binary 
D)  None of the other choices are correct.

Question 19

In an eclipsing binary, the orbits are face-on so you can see both stars orbiting each other at all times.

Accepted Answer

A) True 
 B)False

Question 20

A ___________________ binary is shown in the above simulated spectra.

Accepted Answer

A)  single-lined spectroscopic 
B)  double-lined spectroscopic 
C)  visual 
D)  eclipsing 
A)  single-lined spectroscopic 
B)  double-lined spectroscopic 
C)  visual 
D)  eclipsing

Describe two methods that could be used to determine the temperature of a star.

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

On the H-R diagram, lines of constant radius slants down from left to right.

Luminosity class IV objects are known as ____________________.

Most stars on the H-R diagram are on the ____________________.

To determine the orbital period of a visual binary, we must measure

A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a , of 1 AU with an orbital period, P , of 1 year. What is the mass of the pair of stars?

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct?

a B C Predict the next panel in the spectral sequence of the binary star system shown above.

The least massive main-sequence stars have a/an _ luminosity class and a/an _ spectral class.

How is a luminosity class assigned to a star?

How does the luminosity depend on temperature for stars of the same size?

How can we be certain that white dwarfs are very small?

If a star's apparent visual magnitude is equal to its absolute visual magnitude, how far is the star located from Earth?

How do humans use their eyes to measure relative distance by parallax?

Which is the binary system, and what is the type, in the above figure?

In an eclipsing binary, the orbits are face-on so you can see both stars orbiting each other at all times.

A ___________________ binary is shown in the above simulated spectra.

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

Describe two methods that could be used to determine the temperature of a star.

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

On the H-R diagram, lines of constant radius slants down from left to right.

Luminosity class IV objects are known as ____________________.

Most stars on the H-R diagram are on the ____________________.

To determine the orbital period of a visual binary, we must measure

A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a , of 1 AU with an orbital period, P , of 1 year. What is the mass of the pair of stars?

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct?

a B C Predict the next panel in the spectral sequence of the binary star system shown above.

The least massive main-sequence stars have a/an _____ luminosity class and a/an _____ spectral class.

How is a luminosity class assigned to a star?

How does the luminosity depend on temperature for stars of the same size?

How can we be certain that white dwarfs are very small?

If a star's apparent visual magnitude is equal to its absolute visual magnitude, how far is the star located from Earth?

How do humans use their eyes to measure relative distance by parallax?

Which is the binary system, and what is the type, in the above figure?

In an eclipsing binary, the orbits are face-on so you can see both stars orbiting each other at all times.

A ___________________ binary is shown in the above simulated spectra.

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

The least massive main-sequence stars have a/an _ luminosity class and a/an _ spectral class.