Spectral Classes of Stars

 

CLASS

COLOR

TEMP in Kelvin Degrees

O

Blue

> 25,000

B

Blue

11,000-25,000

A

Blue

7,500-11,000

F

Blue

to White

6,000-7,500

G

White

to Yellow

5,000-6,000

K

Orange

to Red

3,500-5,000

M

Red

< 3,500

The above spectral classes are, in turn divided into ten gradations--from zero to nine. So the hottest class G stars are G0; and the coolest class G stars are G9.

Note: the only candidates for earth-like worlds are "main sequence stars" of spectral classes F, G, and K.

 

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Copyright 1998 Rich Hamper 

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Last Updated:

Sunday, January 20, 2008