Question 1

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 2

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

Accepted Answer

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

Question 3

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 4

The Hertzsprung-Russell diagram can be labeled many different ways. Which coordinates CANNOT be used on an H-R diagram?

Accepted Answer

A)  luminosity versus spectral type 
B)  luminosity versus temperature 
C)  radius versus temperature 
D)  absolute magnitude versus temperature 
E)  luminosity versus color 
A)  luminosity versus spectral type 
B)  luminosity versus temperature 
C)  radius versus temperature 
D)  absolute magnitude versus temperature 
E)  luminosity versus color

Question 5

The Hertzsprung-Russell Diagram is a plot for stars using absolute magnitude versus temperature.

Accepted Answer

A) True 
 B)False

Question 6

Explain why the current spectral classification letters are all jumbled and not in alphabetical order.

Accepted Answer

The spectral classification sequence ori

Question 7

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

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 8

One type of binary star is _______________ binary.

Accepted Answer

visual,spe

Question 9

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

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 10

On the H-R diagram, lines of constant radius are illustrated as _____.

Accepted Answer

A)  sloping downward from right to left 
B)  sloping downward from left to right 
C)  running vertically on the right side 
D)  running horizontally on the top 
E)  moving in various direction depending on the type of star 
A)  sloping downward from right to left 
B)  sloping downward from left to right 
C)  running vertically on the right side 
D)  running horizontally on the top 
E)  moving in various direction depending on the type of star

Question 11

Veg a i s a n A 0 main sequence star . Base d o n thi s informatio n, whic h statement is true?

Accepted Answer

A)  Vega has a surface temperature that is less than the Sun 
B)  Vega has mass that is greater than the Sun 
C)  Vega is less luminous than the Sun 
D)  Vega has mass that is less than the Sun 
E)  Vega is located near the lower right hand corner on the HR diagram 
A)  Vega has a surface temperature that is less than the Sun 
B)  Vega has mass that is greater than the Sun 
C)  Vega is less luminous than the Sun 
D)  Vega has mass that is less than the Sun 
E)  Vega is located near the lower right hand corner on the HR diagram

Question 12

In which spectral sequence are the hottest stars categorized?

Accepted Answer

A)  O stars 
B)  B stars 
C)  A stars 
D)  F stars 
E)  K stars 
A)  O stars 
B)  B stars 
C)  A stars 
D)  F stars 
E)  K stars

Question 13

The Sun is what spectral type?

Accepted Answer

A)  S2 
B)  G2 
C)  F2 
D)  K2 
E)  ST2 (Spectral Type 2) 
A)  S2 
B)  G2 
C)  F2 
D)  K2 
E)  ST2 (Spectral Type 2)

Question 14

Which star has the largest diameter?

Accepted Answer

A)  white dwarf 
B)  main sequence 
C)  red giant 
D)  supergiant 
E)  regular giant 
A)  white dwarf 
B)  main sequence 
C)  red giant 
D)  supergiant 
E)  regular giant

Question 15

The sloped lines from top left to bottom right in the accompanying figure are labeled ____.

Accepted Answer

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

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

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

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 18

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 19

Hydrogen lines are weak in the spectra of hot O-type stars because ____.

Accepted Answer

A)  most of the hydrogen has been converted to helium 
B)  a good spectrum of these stars is difficult to obtain 
C)  these stars have no atmosphere 
D)  gravitational pressure pushes all the hydrogen lines out of the visible spectrum 
E)  most of the hydrogen is ionized to high energy levels 
A)  most of the hydrogen has been converted to helium 
B)  a good spectrum of these stars is difficult to obtain 
C)  these stars have no atmosphere 
D)  gravitational pressure pushes all the hydrogen lines out of the visible spectrum 
E)  most of the hydrogen is ionized to high energy levels

Question 20

Star B has an apparent visual magnitude of +5 and is at a distance of 330 pc.   What is the absolute visual magnitude of Star B?

Accepted Answer

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

Exam 9: The Family of Stars

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

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

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.

The Hertzsprung-Russell diagram can be labeled many different ways. Which coordinates CANNOT be used on an H-R diagram?

The Hertzsprung-Russell Diagram is a plot for stars using absolute magnitude versus temperature.

Explain why the current spectral classification letters are all jumbled and not in alphabetical order.

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

One type of binary star is _______________ binary.

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

On the H-R diagram, lines of constant radius are illustrated as _____.

Veg a i s a n A 0 main sequence star . Base d o n thi s informatio n, whic h statement is true?

In which spectral sequence are the hottest stars categorized?

The Sun is what spectral type?

Which star has the largest diameter?

The sloped lines from top left to bottom right in the accompanying figure are labeled ____.

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 ________.

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.

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

Hydrogen lines are weak in the spectra of hot O-type stars because ____.

Star B has an apparent visual magnitude of +5 and is at a distance of 330 pc. What is the absolute visual magnitude of Star B?

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

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