Star Types Quick Check
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Question
Use the diagram to answer the question.
The Hertzsprung-Russell Diagram is shown. The left y-axis is labeled luminosity and the right y-axis is labeled absolute magnitude. The bottom x-axis is labeled with temperature left parenthesis Kelvin right parenthesis. The temperatures along the bottom are 40,000, 20,000, 10,000, 7,500, 5,500, 4,500, and 3,000. The top x-axis is labeled spectral class. The spectral classes labeled along the top from left to right are O, B, A, F, G, K, and M. Spectral class O lines up with a temperature of 40,000 K. Spectral class B lines up with a temperature of 20,000 K. Spectral class A lines up with a temperature of 10,000 K. Spectral class F lines up with a temperature of 7,500 K. Spectral class G lines up with a temperature of 5,500 K. Spectral class K lines up with a temperature of 4,500 K. Spectral class M lines up with a temperature of 3,000 K. Stars of different luminosity, absolute magnitude, spectral classes, and temperatures are plotted on the graph. Red giants and supergiants are shown in the upper right quadrant, indicating lower temperatures. White dwarfs are shown in the lower left quadrant, indicating higher temperatures and lower luminosity. Different main sequence stars are shown, ranging from hot and bright in the upper left quadrant to cooler and dimmer in lower right quadrant.
Which spectral class does a star fit into if it has a surface temperature of 20,000 K?
(1 point)
Responses
A
A
M
M
B
B
G
G
The spectral class that a star fits into if it has a surface temperature of 20,000 K is B.
Which spectral class does a star fit into if it has a surface temperature of 20,000 K?
(1 point)
Responses
A
A
M
M
B
B
G
The spectral class that a star fits into if it has a surface temperature of 20,000 K is B.
Which piece of spectral data is necessary to determine the spectral class of a star?
(1 point)
Responses
absolute magnitude
absolute magnitude
apparent magnitude
apparent magnitude
luminosity
luminosity
temperature
The piece of spectral data that is necessary to determine the spectral class of a star is temperature.
Which type of star is in spectral class K and has a luminosity of 106?
(1 point)
Responses
blue giant
blue giant
white dwarf
white dwarf
red supergiant
red supergiant
red giant
The type of star in spectral class K and has a luminosity of 106 is a red giant.
Which of these properties is the best measure of a star's brightness?(1 point)
Responses
age
age
apparent magnitude
apparent magnitude
absolute magnitude
absolute magnitude
size
The best measure of a star's brightness is its apparent magnitude.
Which of these phrases describes the sun?(1 point)
Responses
Class G yellow star
Class G yellow star
Class A white star
Class A white star
Class M red star
Class M red star
Class O blue star