Question 1

The hydrogen lines in spectral type A stars

Accepted Answer

A) are most narrow for supergiants. 
B) are most narrow for main-sequence stars. 
C) can not be used to estimate the luminosity of the star. 
D) are very weak and difficult to see. 
E) are useful in determining the apparent magnitude of the star. 
A) are most narrow for supergiants. 
B) are most narrow for main-sequence stars. 
C) can not be used to estimate the luminosity of the star. 
D) are very weak and difficult to see. 
E) are useful in determining the apparent magnitude of the star.

Question 2

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class

Accepted Answer

L star spectra contain bands produced by

Question 3

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

Accepted Answer

A) True 
 B)False

Question 4

As shown in the following spectra, which is taken at two different times, a ________ is concluded.

Accepted Answer

A) visual binary 
B) eclipsing binary 
C) spectroscopic binary 
D) single star 
A) visual binary 
B) eclipsing binary 
C) spectroscopic binary 
D) single star

Question 5

-By how much did the flux increase or decrease from point 1 to point 2 in the following figure if the distance to 1 is r and the distance to 2 is 2r

Accepted Answer

A) increase by double 
B) decrease by double 
C) increase by quadruple 
D) decrease by quadruple 
A) increase by double 
B) decrease by double 
C) increase by quadruple 
D) decrease by quadruple

Question 6

Binary (double) stars can be detected by

Accepted Answer

A) being seen as two separate stars with a telescope. 
B) one star traveling a wiggly proper-motion path across the sky. 
C) one star dimming abruptly as another passes in front of it. 
D) pairs of absorption lines seen in the spectrum of what appears to be one star. 
E) All of the other choices are correct. 
A) being seen as two separate stars with a telescope. 
B) one star traveling a wiggly proper-motion path across the sky. 
C) one star dimming abruptly as another passes in front of it. 
D) pairs of absorption lines seen in the spectrum of what appears to be one star. 
E) All of the other choices are correct.

Question 7

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

Accepted Answer

A) True 
 B)False

Question 8

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 9

Stars of spectra type K have strong Balmer lines.

Accepted Answer

A) True 
 B)False

Question 10

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 11

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 12

Table 8-1
 
-From the data given, which star in Table 8-1 would appear the faintest in the night sky

Accepted Answer

A) 65 Tau 
B) HR 4621 
C) α Pic 
D) 58 Ori 
E) HR 2491 
A) 65 Tau 
B) HR 4621 
C) α Pic 
D) 58 Ori 
E) HR 2491

Question 13

To observe a visual binary, we must measure radial velocities.

Accepted Answer

A) True 
 B)False

Question 14

abcPredict 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 15

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

Accepted Answer

The answer of For stars on the main sequence, the...

Question 16

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars.

Accepted Answer

A) the minimum masses 
B) the sizes 
C) both minimum masses and sizes 
D) neither minimum masses nor sizes 
A) the minimum masses 
B) the sizes 
C) both minimum masses and sizes 
D) neither minimum masses nor sizes

Question 17

Two stars of the same spectral class must have the same

Accepted Answer

A) radius. 
B) temperature. 
C) mass. 
D) distance. 
E) all of the other choices. 
A) radius. 
B) temperature. 
C) mass. 
D) distance. 
E) all of the other choices.

Question 18

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 19

What information can we get from eclipsing binaries that we cannot get from visual binaries

Accepted Answer

Because the orbital plane of e

Question 20

On the H-R diagram, cool and bright stars are located in the ________ corner.

Accepted Answer

A) upper left 
B) upper right 
C) lower left 
D) lower right 
A) upper left 
B) upper right 
C) lower left 
D) lower right

The hydrogen lines in spectral type A stars

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

As shown in the following spectra, which is taken at two different times, a ________ is concluded.

-By how much did the flux increase or decrease from point 1 to point 2 in the following figure if the distance to 1 is r and the distance to 2 is 2r

Binary (double) stars can be detected by

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

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.

Stars of spectra type K have strong Balmer lines.

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

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

Table 8-1 -From the data given, which star in Table 8-1 would appear the faintest in the night sky

To observe a visual binary, we must measure radial velocities.

abcPredict the next panel in the spectral sequence of the binary star system shown above.

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars.

Two stars of the same spectral class must have the same

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

What information can we get from eclipsing binaries that we cannot get from visual binaries

On the H-R diagram, cool and bright stars are located in the ________ corner.

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

The Origin of the Solar System

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

The hydrogen lines in spectral type A stars

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class

The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

As shown in the following spectra, which is taken at two different times, a ________ is concluded.

-By how much did the flux increase or decrease from point 1 to point 2 in the following figure if the distance to 1 is r and the distance to 2 is 2r

Binary (double) stars can be detected by

Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type.

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.

Stars of spectra type K have strong Balmer lines.

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

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

Table 8-1 -From the data given, which star in Table 8-1 would appear the faintest in the night sky

To observe a visual binary, we must measure radial velocities.

abcPredict the next panel in the spectral sequence of the binary star system shown above.

For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________.

Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars.

Two stars of the same spectral class must have the same

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

What information can we get from eclipsing binaries that we cannot get from visual binaries

On the H-R diagram, cool and bright stars are located in the ________ corner.

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

The Origin of the Solar System

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.