Question 1

Acrux has an MV = -4.2 and an mV = 0.81. Therefore, Acrux is actually brighter than we perceive it to be.

Accepted Answer

A) True 
 B)False  True

Question 2

The spectral types for each of five stars are given. Which star in would have the greatest surface temperature

Accepted Answer

A) α For; F8 
B) ο Cet; M7 
C) 35 Ari; B3 
D) γ Tri; A0 
E) ξ Per; O7 
A) α For; F8 
B) ο Cet; M7 
C) 35 Ari; B3 
D) γ Tri; A0 
E) ξ Per; O7 E

Question 3

The absorption lines in the ultraviolet portion of the spectrum of a star that are produced by hydrogen are from the

Accepted Answer

A) Lyman series. 
B) Balmer series. 
C) Paschen series. 
D) isotopes of hydrogen. 
E) ions of hydrogen. 
A) Lyman series. 
B) Balmer series. 
C) Paschen series. 
D) isotopes of hydrogen. 
E) ions of hydrogen. A

Question 4

Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms have their electrons in levels above the second level.

Accepted Answer

A) True 
 B)False

Question 5

Which stars always have large positive absolute magnitude

Accepted Answer

A) stars of high luminosity 
B) stars of low luminosity 
C) nearby stars 
D) distant stars 
E) not enough information given 
A) stars of high luminosity 
B) stars of low luminosity 
C) nearby stars 
D) distant stars 
E) not enough information given

Question 6

If two stars are emitting the same amount of light and are the same size, the star that is farther will appear

Accepted Answer

A) brighter. 
B) dimmer. 
C) redder. 
D) bluer. 
E) They will have the same brightness as seen from Earth. 
A) brighter. 
B) dimmer. 
C) redder. 
D) bluer. 
E) They will have the same brightness as seen from Earth.

Question 7

The more massive a main-sequence star, the more ___________ it is, as found by the M-L relation.

Accepted Answer

The answer of The more massive a main-sequence star, the...

Question 8

If you compare two stars,

Accepted Answer

A) the one with the larger radius will always have the greater luminosity. 
B) the one with the higher surface temperature will always have the greater luminosity. 
C) the one with the smaller absolute magnitude will always have the greater luminosity. 
D) the one with the larger surface area has the greater energy flux from its surface. 
A) the one with the larger radius will always have the greater luminosity. 
B) the one with the higher surface temperature will always have the greater luminosity. 
C) the one with the smaller absolute magnitude will always have the greater luminosity. 
D) the one with the larger surface area has the greater energy flux from its surface.

Question 9

Where would Class Ia be located on the H-R diagram

Accepted Answer

A) a line through the giants 
B) a horizontal line through the supergiants 
C) along the main sequence 
D) along the white dwarf line 
A) a line through the giants 
B) a horizontal line through the supergiants 
C) along the main sequence 
D) along the white dwarf line

Question 10

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 11

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

Accepted Answer

A) True 
 B)False

Question 12

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 13

Table 8-1
 
-From the data given, which star in Table 8-1 has the greatest surface temperature

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 14

The densest stars in the H-R diagram are the white dwarfs.

Accepted Answer

A) True 
 B)False

Question 15

What kind of spectra is shown in the color photographs above

Accepted Answer

A) emission 
B) absorption 
C) continuous 
D) thermal 
A) emission 
B) absorption 
C) continuous 
D) thermal

Question 16

The distance to Canopus is 96 pc. What is the parallax angle as observed from the Sun

Accepted Answer

A) 0.01 degrees 
B) 0.01 arc minutes 
C) 0.01 arc seconds 
D) 96 pc 
A) 0.01 degrees 
B) 0.01 arc minutes 
C) 0.01 arc seconds 
D) 96 pc

Question 17

In the light curve below, what is the period of the eclipsing binary

Accepted Answer

A) 5 days 
B) 32.5 days 
C) 7.5 days 
D) 42.5 days 
E) 50 days 
A) 5 days 
B) 32.5 days 
C) 7.5 days 
D) 42.5 days 
E) 50 days

Question 18

The Moon orbits the Earth the Earth orbits the Sun. If the Earth-moon system is ˜1 AU from the Sun and takes ˜1 Earth year to orbit, what is the combined mass of the triple system Express your answer in solar mass units.

Accepted Answer

A) 1 
B) 1.1 
C) 1.2 
D) 1.3 
A) 1 
B) 1.1 
C) 1.2 
D) 1.3

Question 19

The star HR 4621 has an apparent magnitude of 2.6 and an absolute magnitude of -0.3. This star is at a distance

Accepted Answer

A) closer than 10 pc. 
B) farther than 10 pc. 
C) No way to tell. 
A) closer than 10 pc. 
B) farther than 10 pc. 
C) No way to tell.

Question 20

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars

Accepted Answer

If a star is cool, there are few violent

Acrux has an MV = -4.2 and an mV = 0.81. Therefore, Acrux is actually brighter than we perceive it to be.

The spectral types for each of five stars are given. Which star in would have the greatest surface temperature

The absorption lines in the ultraviolet portion of the spectrum of a star that are produced by hydrogen are from the

Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms have their electrons in levels above the second level.

Which stars always have large positive absolute magnitude

If two stars are emitting the same amount of light and are the same size, the star that is farther will appear

The more massive a main-sequence star, the more ___________ it is, as found by the M-L relation.

If you compare two stars,

Where would Class Ia be located on the H-R diagram

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

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

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.

Table 8-1 -From the data given, which star in Table 8-1 has the greatest surface temperature

The densest stars in the H-R diagram are the white dwarfs.

What kind of spectra is shown in the color photographs above

The distance to Canopus is 96 pc. What is the parallax angle as observed from the Sun

In the light curve below, what is the period of the eclipsing binary

The Moon orbits the Earth the Earth orbits the Sun. If the Earth-moon system is ˜1 AU from the Sun and takes ˜1 Earth year to orbit, what is the combined mass of the triple system Express your answer in solar mass units.

The star HR 4621 has an apparent magnitude of 2.6 and an absolute magnitude of -0.3. This star is at a distance

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars

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

Acrux has an MV = -4.2 and an mV = 0.81. Therefore, Acrux is actually brighter than we perceive it to be.

The spectral types for each of five stars are given. Which star in would have the greatest surface temperature

The absorption lines in the ultraviolet portion of the spectrum of a star that are produced by hydrogen are from the

Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms have their electrons in levels above the second level.

Which stars always have large positive absolute magnitude

If two stars are emitting the same amount of light and are the same size, the star that is farther will appear

The more massive a main-sequence star, the more ___________ it is, as found by the M-L relation.

If you compare two stars,

Where would Class Ia be located on the H-R diagram

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

A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc.

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.

Table 8-1 -From the data given, which star in Table 8-1 has the greatest surface temperature

The densest stars in the H-R diagram are the white dwarfs.

What kind of spectra is shown in the color photographs above

The distance to Canopus is 96 pc. What is the parallax angle as observed from the Sun

In the light curve below, what is the period of the eclipsing binary

The Moon orbits the Earth the Earth orbits the Sun. If the Earth-moon system is ˜1 AU from the Sun and takes ˜1 Earth year to orbit, what is the combined mass of the triple system Express your answer in solar mass units.

The star HR 4621 has an apparent magnitude of 2.6 and an absolute magnitude of -0.3. This star is at a distance

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars

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