Semester A Review Practice
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Question
Use the diagram to answer the question.
A graph illustrates the relationship between the luminosity (Sun = 1), ranging from 0.0001 to 10000, and temperature in Kelvin, ranging from 30000 to 3000, for various stars classifications. Main sequence stars extend diagonally from the top left to the bottom right corner of the graph. The White Dwarfs, Giants, and Super Giants are placed on the graph according to their luminosity and temperature.
Which stars can be classified in spectral class A? Select all two correct answers.
(1 point)
Responses
Main sequence stars with a luminosity of 104.
Main sequence stars with a luminosity of 10 4 .
White dwarfs with a luminosity around 10–2.
White dwarfs with a luminosity around 10 –2 .
Red giants with an absolute magnitude of 0.
Red giants with an absolute magnitude of 0.
Blue giants with a temperature of 10,000 K.
Blue giants with a temperature of 10,000 K.
Red supergiants with a temperature of 4,500 K.
The correct answers are:
- Main sequence stars with a luminosity of 10^4.
- Blue giants with a temperature of 10,000 K.
Both of these options fall within the spectral class A range on the diagram.