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.


If a star has an absolute magnitude of 10 and a temperature of 20,000 K, under which spectral class would the star be classified?

(1 point)
Responses

O
O

F
F

B
B

A
A

Answer 1

To classify a star with an absolute magnitude of 10 and a temperature of 20,000 K, we can refer to the general characteristics of different spectral classes:

• O-type stars are very hot, with temperatures typically above 30,000 K.
• B-type stars have temperatures ranging from about 10,000 to 30,000 K.
• A-type stars have temperatures from about 7,500 to 10,000 K.
• F-type stars are cooler, with temperatures between 6,000 and 7,500 K.

Given that the star has a temperature of 20,000 K, it falls within the range typical for B-type stars.

Therefore, the correct classification for the star would be B.