Question 1

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

Accepted Answer

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

Question 2

The nearest star,Proxima Centauri,is about four light years away and has a luminosity about 0.001 times that of the Sun.If Proxima Centauri were at a distance of one light year instead of four,how much brighter would it appear in the sky?

Accepted Answer

A) twice as bright 
B) four times as bright 
C) 16 times as bright 
D) 4000 times as bright 
A) twice as bright 
B) four times as bright 
C) 16 times as bright 
D) 4000 times as bright

Question 3

The table lists the spectral types for each of four stars.Which star in this table would have the lowest surface temperature?

Accepted Answer

A) α For 
B) o Cet 
C) ƴ Tri 
D)  $ \xi $ Per 
A) α For 
B) o Cet 
C) ƴ Tri 
D)  $ \xi $ Per

Question 4

What is absolute visual magnitude?

Accepted Answer

A) the luminosity of a star observed from Earth 
B) the luminosity of a star observed from a distance of 1000 parsecs 
C) the apparent magnitude of a star observed from a distance of 10 parsecs 
D) the apparent magnitude of a star observed from Earth 
A) the luminosity of a star observed from Earth 
B) the luminosity of a star observed from a distance of 1000 parsecs 
C) the apparent magnitude of a star observed from a distance of 10 parsecs 
D) the apparent magnitude of a star observed from Earth

Question 5

The star named Circini has the spectral type and luminosity class of O 8.5 V.Based on this information,how does Circini compare to the Sun?

Accepted Answer

A) Circini is cooler and larger than the Sun. 
B) Circini is cooler and smaller than the Sun. 
C) Circini is hotter and more luminous than the Sun. 
D) Circini is hotter and less luminous than the Sun. 
A) Circini is cooler and larger than the Sun. 
B) Circini is cooler and smaller than the Sun. 
C) Circini is hotter and more luminous than the Sun. 
D) Circini is hotter and less luminous than the Sun.

Question 6

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

Accepted Answer

The answer of What measurements are needed to determine the...

Question 7

How do absolute visual magnitude and luminosity differ?

Accepted Answer

The answer of How do absolute visual magnitude and luminosity...

Question 8

-The diagram shows the radial velocity curve of a double-line spectroscopic binary.Based on this radial velocity curve,what is the mass of star B compared to star A?

Accepted Answer

A) Star B is one-tenth the mass of star A. 
B) Star B is half the mass of star A. 
C) Star B is twice the mass of star A. 
D) Star B is ten times the mass of star A. 
A) Star B is one-tenth the mass of star A. 
B) Star B is half the mass of star A. 
C) Star B is twice the mass of star A. 
D) Star B is ten times the mass of star A.

Question 9

When we see a binary system producing eclipses,we know that the orbit is nearly edge-on.

Accepted Answer

A) True 
 B)False

Question 10

What property do most of the (apparently)bright stars in the sky share?

Accepted Answer

A) They are close to Earth. 
B) They are very luminous. 
C) They are main-sequence stars. 
D) They are red dwarfs. 
A) They are close to Earth. 
B) They are very luminous. 
C) They are main-sequence stars. 
D) They are red dwarfs.

Question 11

Absolute magnitude is defined as the apparent magnitude that a star would have if observed at a distance of 33 light years.Consider a star at a distance of 330 light years that has an apparent magnitude of +5.What would its absolute magnitude be?

Accepted Answer

A) It would be less than +5. 
B) It would be exactly +5. 
C) It would be greater than +5. 
D) More information on the star's luminosity would be required to answer this question. 
A) It would be less than +5. 
B) It would be exactly +5. 
C) It would be greater than +5. 
D) More information on the star's luminosity would be required to answer this question.

Question 12

If we can solve the orbital motion of a spectroscopic binary,what can we find?

Accepted Answer

A) the mass of each star 
B) the diameter of each star 
C) the orbital period 
D) the sum of the stars' masses 
A) the mass of each star 
B) the diameter of each star 
C) the orbital period 
D) the sum of the stars' masses

Question 13

How can we tell that some stars are relatively close to us in the sky?

Accepted Answer

A) Some stars are occasionally eclipsed by the Moon, so they must be nearby. 
B) Some stars vary in brightness caused by sunspots that we can see because they are so close. 
C) Some stars appear to be extremely bright and must therefore be very close to us. 
D) Some stars appear to move periodically back and forth against the background stars because of the Earth's movement around the Sun. 
A) Some stars are occasionally eclipsed by the Moon, so they must be nearby. 
B) Some stars vary in brightness caused by sunspots that we can see because they are so close. 
C) Some stars appear to be extremely bright and must therefore be very close to us. 
D) Some stars appear to move periodically back and forth against the background stars because of the Earth's movement around the Sun.

Question 14

$$\begin{array} { | l | c | c | } 
\hline { \text { Star } } & \begin{array} { c } 
\text { Parallax } \
\text { (sec of arc) }
\end{array} & \begin{array} { c } 
\text { Spectral } \
\text { Type }
\end{array} \
\hline 5 \text { Cen } & 0.026 & \text { B2 IV } \
\hline \text { HR 4758 } & 0.05 & \text { G0 V } \
\hline \text { HD 39801 } & 0.005 & \text { M2 I } \
\hline 9 \mathrm { CMa } & 0.4 & \text { Al V } \
\hline
\end{array}$$
-Which star in the table is the closest to Earth?

Accepted Answer

A) ? Cen 
B) HR 4758 
C) HD 39801 
D) 9 CMa 
A) ? Cen 
B) HR 4758 
C) HD 39801 
D) 9 CMa

Question 15

What does a spectroscopic binary show periodic variations in?

Accepted Answer

A) radial velocity 
B) proper motion 
C) brightness 
D) spectral type 
A) radial velocity 
B) proper motion 
C) brightness 
D) spectral type

Question 16

A G2 I star is ____________________ in diameter and ____________________ luminous than the Sun.

Accepted Answer

The answer of A G2 I star is ____________________ in...

Question 17

$$\begin{array} { | l | c | c | } 
\hline { \text { Star } } & \begin{array} { c } 
\text { Parallax } \
\text { (sec of arc) }
\end{array} & \begin{array} { c } 
\text { Spectral } \
\text { Type }
\end{array} \
\hline 5 \text { Cen } & 0.026 & \text { B2 IV } \
\hline \text { HR 4758 } & 0.05 & \text { G0 V } \
\hline \text { HD 39801 } & 0.005 & \text { M2 I } \
\hline 9 \mathrm { CMa } & 0.4 & \text { Al V } \
\hline
\end{array}$$
-Which star in the table has the highest surface temperature?

Accepted Answer

A) ? Cen 
B) HR 4758 
C) HD 39801 
D) 9 CMa 
A) ? Cen 
B) HR 4758 
C) HD 39801 
D) 9 CMa

Question 18

How do we know that giant stars are larger in diameter than the Sun?

Accepted Answer

A) They are more luminous but have about the same temperature. 
B) They are less luminous but have about the same temperature. 
C) They are hotter but have about the same luminosity. 
D) They are cooler but have about the same luminosity. 
A) They are more luminous but have about the same temperature. 
B) They are less luminous but have about the same temperature. 
C) They are hotter but have about the same luminosity. 
D) They are cooler but have about the same luminosity.

Question 19

The more massive star in a binary system is always farthest from the centre of mass.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

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

The nearest star,Proxima Centauri,is about four light years away and has a luminosity about 0.001 times that of the Sun.If Proxima Centauri were at a distance of one light year instead of four,how much brighter would it appear in the sky?

The table lists the spectral types for each of four stars.Which star in this table would have the lowest surface temperature?

What is absolute visual magnitude?

The star named Circini has the spectral type and luminosity class of O 8.5 V.Based on this information,how does Circini compare to the Sun?

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

How do absolute visual magnitude and luminosity differ?

-The diagram shows the radial velocity curve of a double-line spectroscopic binary.Based on this radial velocity curve,what is the mass of star B compared to star A?

When we see a binary system producing eclipses,we know that the orbit is nearly edge-on.

What property do most of the (apparently)bright stars in the sky share?

Absolute magnitude is defined as the apparent magnitude that a star would have if observed at a distance of 33 light years.Consider a star at a distance of 330 light years that has an apparent magnitude of +5.What would its absolute magnitude be?

If we can solve the orbital motion of a spectroscopic binary,what can we find?

How can we tell that some stars are relatively close to us in the sky?

Star Parallax (sec of arc) Spectral Type 5 Cen 0.026 B2 IV HR 4758 0.05 G0 V HD 39801 0.005 M2 I 9 0.4 Al V -Which star in the table is the closest to Earth?

What does a spectroscopic binary show periodic variations in?

A G2 I star is in diameter and luminous than the Sun.

Star Parallax (sec of arc) Spectral Type 5 Cen 0.026 B2 IV HR 4758 0.05 G0 V HD 39801 0.005 M2 I 9 0.4 Al V -Which star in the table has the highest surface temperature?

How do we know that giant stars are larger in diameter than the Sun?

The more massive star in a binary system is always farthest from the centre of mass.

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

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters

Exam 6: The Family of Stars

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

The nearest star,Proxima Centauri,is about four light years away and has a luminosity about 0.001 times that of the Sun.If Proxima Centauri were at a distance of one light year instead of four,how much brighter would it appear in the sky?

The table lists the spectral types for each of four stars.Which star in this table would have the lowest surface temperature?

What is absolute visual magnitude?

The star named Circini has the spectral type and luminosity class of O 8.5 V.Based on this information,how does Circini compare to the Sun?

What measurements are needed to determine the orbital motion of a spectroscopic binary star?

How do absolute visual magnitude and luminosity differ?

-The diagram shows the radial velocity curve of a double-line spectroscopic binary.Based on this radial velocity curve,what is the mass of star B compared to star A?

When we see a binary system producing eclipses,we know that the orbit is nearly edge-on.

What property do most of the (apparently)bright stars in the sky share?

Absolute magnitude is defined as the apparent magnitude that a star would have if observed at a distance of 33 light years.Consider a star at a distance of 330 light years that has an apparent magnitude of +5.What would its absolute magnitude be?

If we can solve the orbital motion of a spectroscopic binary,what can we find?

How can we tell that some stars are relatively close to us in the sky?

Star Parallax (sec of arc) Spectral Type 5 Cen 0.026 B2 IV HR 4758 0.05 G0 V HD 39801 0.005 M2 I 9 0.4 Al V -Which star in the table is the closest to Earth?

What does a spectroscopic binary show periodic variations in?

A G2 I star is ____________________ in diameter and ____________________ luminous than the Sun.

Star Parallax (sec of arc) Spectral Type 5 Cen 0.026 B2 IV HR 4758 0.05 G0 V HD 39801 0.005 M2 I 9 0.4 Al V -Which star in the table has the highest surface temperature?

How do we know that giant stars are larger in diameter than the Sun?

The more massive star in a binary system is always farthest from the centre of mass.

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

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters

A G2 I star is in diameter and luminous than the Sun.