Question 1

The formula $m _ { V } - M _ { V }$  can be used to calculate a star's _____.

Accepted Answer

A)  mass 
B)  distance 
C)  rotation speed 
D)  revolution period 
E)  diameter 
A)  mass 
B)  distance 
C)  rotation speed 
D)  revolution period 
E)  diameter

Question 2

Stellar spectra started with the amount of hydrogen found in the star's spectrum and started with the letters A through Q.  What are the current letters used to classify stellar spectra?

Accepted Answer

The answer of Stellar spectra started with the amount of...

Question 3

A star's absolute brightness is calculated at a standard distance of 10 parsecs.

Accepted Answer

A) True 
 B)False

Question 4

Star A has an apparent visual magnitude of +5 and an absolute visual magnitude of -4.   What is the distance to Star A?

Accepted Answer

The answer of Star A has an apparent visual magnitude...

Question 5

On the H-R diagram, 90 percent of all stars are _______________.

Accepted Answer

The answer of On the H-R diagram, 90 percent of...

Question 6

The vertical axis in the accompanying figure is labeled _____.

Accepted Answer

A)  temperature 
B)  radius 
C)  apparent visual magnitude 
D)  absolute visual magnitude 
E)  mass 
A)  temperature 
B)  radius 
C)  apparent visual magnitude 
D)  absolute visual magnitude 
E)  mass

Question 7

In the accompanying figure, which region represents supergiant stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Accepted Answer

The answer of   
In the accompanying figure, which...

Question 8

A star's absolute visual magnitude depends only on the star's ______ and _____.

Accepted Answer

A)  temperature; mass 
B)  diameter; mass 
C)  temperature; density 
D)  diameter; density 
E)  distance; magnitude 
A)  temperature; mass 
B)  diameter; mass 
C)  temperature; density 
D)  diameter; density 
E)  distance; magnitude

Question 9

In the accompanying figure, which region represents approximately 80 percent of normal stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Accepted Answer

The answer of   
In the accompanying figure, which...

Question 10

Groombridge 34 i s an M2 main sequence star . Base d o n thi s informatio n, whic h statement is true?

Accepted Answer

A)  Groombridge 34 has a surface temperature that is more than the Sun. 
B)  Groombridge 34 has mass that is greater than the Sun. 
C)  Groombridge 34 is less luminous than the Sun. 
D)  Groombridge 34 is more luminous than the Sun. 
E)  Groombridge 34 is located near the upper left hand corner on the HR diagram. 
A)  Groombridge 34 has a surface temperature that is more than the Sun. 
B)  Groombridge 34 has mass that is greater than the Sun. 
C)  Groombridge 34 is less luminous than the Sun. 
D)  Groombridge 34 is more luminous than the Sun. 
E)  Groombridge 34 is located near the upper left hand corner on the HR diagram.

Question 11

How do astronomers determine the distance to stars that are farther than 100 parsecs away?

Accepted Answer

A)  measuring the shift of the stellar parallax 
B)  estimating a star's spectral type and comparing it to the spectroscopic parallax 
C)  subtracting absolute from apparent magnitudes 
D)  using trigonometry in the triangulation method 
E)  measuring the proper motion of a star 
A)  measuring the shift of the stellar parallax 
B)  estimating a star's spectral type and comparing it to the spectroscopic parallax 
C)  subtracting absolute from apparent magnitudes 
D)  using trigonometry in the triangulation method 
E)  measuring the proper motion of a star

Question 12

If a star has an apparent magnitude of +5 and an absolute magnitude of -10, what can we say about that star?

Accepted Answer

A)  The star is farther than 10 parsecs away. 
B)  The star is closer than 10 parsecs away. 
C)  The star has a very large chromosphere. 
D)  The star has a very large corona. 
E)  The star is fainter than the Sun. 
A)  The star is farther than 10 parsecs away. 
B)  The star is closer than 10 parsecs away. 
C)  The star has a very large chromosphere. 
D)  The star has a very large corona. 
E)  The star is fainter than the Sun.

Question 13

The horizontal axis (X-axis) of the Hertzsprung-Russell diagram is labeled with _______________.

Accepted Answer

temperatur

Question 14

A star's apparent magnitude is a measure of how bright it appears to us if it is at its actual distance.

Accepted Answer

A) True 
 B)False

Question 15

The spectral classification of stars started with the amount of hydrogen present in their spectra, but a better method now uses the amount of oxygen in the star's spectra.

Accepted Answer

A) True 
 B)False

Question 16

Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________.

Accepted Answer

A)  has a very large "sunspot" on its surface 
B)  is a member of an eclipsing binary star system 
C)  is a white dwarf 
D)  is a Cepheid variable 
E)  is periodically ejecting gas into space, every 93 hours 
A)  has a very large "sunspot" on its surface 
B)  is a member of an eclipsing binary star system 
C)  is a white dwarf 
D)  is a Cepheid variable 
E)  is periodically ejecting gas into space, every 93 hours

Question 17

Which type of binary system have pairs of stars that are so close together that they look like one single point?

Accepted Answer

A)  radio binary 
B)  eclipsing binary 
C)  visual binary 
D)  spectroscopic binary 
E)  neutron star binary 
A)  radio binary 
B)  eclipsing binary 
C)  visual binary 
D)  spectroscopic binary 
E)  neutron star binary

Question 18

The vertical axis (Y-axis) of the Hertzsprung-Russell Diagram is labeled with _______________.

Accepted Answer

luminosity

Question 19

A star's absolute visual magnitude depends on its _______________ and _______________.

Accepted Answer

temperatur

Question 20

The least common type of star is a(n) ____.

Accepted Answer

A)  white dwarf 
B)  lower main sequence 
C)  upper main sequence 
D)  giant 
E)  supergiant 
A)  white dwarf 
B)  lower main sequence 
C)  upper main sequence 
D)  giant 
E)  supergiant

Exam 9: The Family of Stars

The formula mV−MVm _ { V } - M _ { V }mV​−MV​ can be used to calculate a star's _____.

Stellar spectra started with the amount of hydrogen found in the star's spectrum and started with the letters A through Q. What are the current letters used to classify stellar spectra?

A star's absolute brightness is calculated at a standard distance of 10 parsecs.

Star A has an apparent visual magnitude of +5 and an absolute visual magnitude of -4. What is the distance to Star A?

On the H-R diagram, 90 percent of all stars are _______________.

The vertical axis in the accompanying figure is labeled _____.

In the accompanying figure, which region represents supergiant stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

A star's absolute visual magnitude depends only on the star's ______ and _____.

In the accompanying figure, which region represents approximately 80 percent of normal stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.

Groombridge 34 i s an M2 main sequence star . Base d o n thi s informatio n, whic h statement is true?

How do astronomers determine the distance to stars that are farther than 100 parsecs away?

If a star has an apparent magnitude of +5 and an absolute magnitude of -10, what can we say about that star?

The horizontal axis (X-axis) of the Hertzsprung-Russell diagram is labeled with _______________.

A star's apparent magnitude is a measure of how bright it appears to us if it is at its actual distance.

The spectral classification of stars started with the amount of hydrogen present in their spectra, but a better method now uses the amount of oxygen in the star's spectra.

Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________.

Which type of binary system have pairs of stars that are so close together that they look like one single point?

The vertical axis (Y-axis) of the Hertzsprung-Russell Diagram is labeled with _______________.

A star's absolute visual magnitude depends on its _______________ and _______________.

The least common type of star is a(n) ____.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters

The formula $m _ { V } - M _ { V }$ can be used to calculate a star's _____.

A star's absolute visual magnitude depends only on the star's __ and _.

A star's absolute visual magnitude depends on its _ and _.