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

Question

(1 point)
Responses

O
O

B
B

F
F

A

Answer 1

To classify a star based on its absolute magnitude and temperature, you can refer to the Hertzsprung-Russell diagram, which categorizes stars into different spectral classes based primarily on their temperature (measured in Kelvin) and luminosity (or absolute magnitude).

In general:

• Class O stars have temperatures greater than 30,000 K.
• Class B stars have temperatures ranging from about 10,000 K to 30,000 K.
• Class A stars range from about 7,500 K to 10,000 K.
• Class F stars are between 6,000 K and 7,500 K.

Given that the star in question has a temperature of 20,000 K, it falls within the range of Class B stars. Therefore, the correct classification for the star would be:

B