Question 1

________ dwarfs are M dwarfs on the main sequence whereas _________ dwarfs are hot, dim, and not on the main sequence.

Accepted Answer

The answer of ________ dwarfs are M dwarfs on the...

Question 2

The most accurate way to determine the surface temperature of a star is to study

Accepted Answer

A)  the pattern of absorption lines from various atoms. 
B)  the relative intensities of light measured through different photometric filters. 
C)  the peak wavelength of the star's continuous blackbody spectrum. 
D)  pattern of emission lines that are on the star's spectrum. 
A)  the pattern of absorption lines from various atoms. 
B)  the relative intensities of light measured through different photometric filters. 
C)  the peak wavelength of the star's continuous blackbody spectrum. 
D)  pattern of emission lines that are on the star's spectrum.

Question 3

If a star with an absolute magnitude of − 5 has an apparent magnitude of +5, then its distance is

Accepted Answer

A)  1 pc. 
B)  10 pc. 
C)  100 pc. 
D)  1000 pc. 
E)  10,000 pc. 
A)  1 pc. 
B)  10 pc. 
C)  100 pc. 
D)  1000 pc. 
E)  10,000 pc.

Question 4

The light curve of a/an ___________ binary can reveal both masses and diameters of the stars.

Accepted Answer

The answer of The light curve of a/an ___________ binary...

Question 5

How does absolute visual magnitude tell us the intrinsic brightness of a star?

Accepted Answer

The absolute visual magnitude

Question 6

The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, which of the following are true?
I. Circini has a surface temperature less than the Sun.
II. Circini has a diameter that is greater than that of the Sun.
III. Circini is more luminous than the Sun.
IV. Circini is located near the upper left-hand corner in the H-R diagram.

Accepted Answer

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

Question 7

-Table 8-2 Use the chart below to answer the following question(s).
Which star in Table 8-2 has the greatest diameter?

Accepted Answer

A)  δ Cen 
B)  HR 4607 
C)  HR 4758 
D)  HD 39801 
E)  9 CMa 
A)  δ Cen 
B)  HR 4607 
C)  HR 4758 
D)  HD 39801 
E)  9 CMa

Question 8

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Accepted Answer

A)  the stars are in an elliptical orbit around one another. 
B)  the mass of the pair can be estimated. 
C)  one star is passing by the other never to return. 
D)  both the stars are in an elliptical orbit around one another. 
A)  the stars are in an elliptical orbit around one another. 
B)  the mass of the pair can be estimated. 
C)  one star is passing by the other never to return. 
D)  both the stars are in an elliptical orbit around one another.

Question 9

Red giant stars are
I. more luminous than the Sun.
II. larger in diameter than the Sun.
III. cooler than B stars.
IV. located above the main-sequence stars in the H-R diagram.

Accepted Answer

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

Question 10

? star has a radius similar to that of the Sun but half the Sun's luminosity. What is the surface temperature of this star using this data?

Accepted Answer

A)  0.84 T S1U1B1SunS1U1B0 
B)  0.43 T S1U1B1SunS1U1B0 
C)  1.2 T S1U1B1SunS1U1B0 
D)  2.4 T S1U1B1SunS1U1B0 
A)  0.84 T S1U1B1SunS1U1B0 
B)  0.43 T S1U1B1SunS1U1B0 
C)  1.2 T S1U1B1SunS1U1B0 
D)  2.4 T S1U1B1SunS1U1B0

dwarfs are M dwarfs on the main sequence whereas _ dwarfs are hot, dim, and not on the main sequence.

The most accurate way to determine the surface temperature of a star is to study

If a star with an absolute magnitude of − 5 has an apparent magnitude of +5, then its distance is

The light curve of a/an ___________ binary can reveal both masses and diameters of the stars.

How does absolute visual magnitude tell us the intrinsic brightness of a star?

-Table 8-2 Use the chart below to answer the following question(s). Which star in Table 8-2 has the greatest diameter?

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Red giant stars are I. more luminous than the Sun. II. larger in diameter than the Sun. III. cooler than B stars. IV. located above the main-sequence stars in the H-R diagram.

? star has a radius similar to that of the Sun but half the Sun's luminosity. What is the surface temperature of this star using this data?

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

________ dwarfs are M dwarfs on the main sequence whereas _________ dwarfs are hot, dim, and not on the main sequence.

The most accurate way to determine the surface temperature of a star is to study

If a star with an absolute magnitude of − 5 has an apparent magnitude of +5, then its distance is

The light curve of a/an ___________ binary can reveal both masses and diameters of the stars.

How does absolute visual magnitude tell us the intrinsic brightness of a star?

-Table 8-2 Use the chart below to answer the following question(s). Which star in Table 8-2 has the greatest diameter?

The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Red giant stars are I. more luminous than the Sun. II. larger in diameter than the Sun. III. cooler than B stars. IV. located above the main-sequence stars in the H-R diagram.

? star has a radius similar to that of the Sun but half the Sun's luminosity. What is the surface temperature of this star using this data?

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

dwarfs are M dwarfs on the main sequence whereas _ dwarfs are hot, dim, and not on the main sequence.