Use the diagram to answer the question.

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 spectral class would a star fit into if it had a surface temperature of 20,000 K?

(1 point)
Responses

A
A

O
O

B
B

F

Answer 1

To determine the spectral class of a star with a surface temperature of 20,000 K, we can reference the typical temperature ranges associated with different spectral classes:

• O type: 30,000 K and above
• B type: 10,000 K to 30,000 K
• A type: 7,500 K to 10,000 K
• F type: 6,000 K to 7,500 K
• G type: 5,000 K to 6,000 K
• K type: 3,500 K to 5,000 K
• M type: below 3,500 K

Given that 20,000 K falls within the range of 10,000 K to 30,000 K, the star would be classified as a B type spectral class.

The correct response is B.