How many types of stars exist?

1 Answer
Apr 21, 2016

Grades, from hottest to coldest, with associated colors: O-Blue B-Bluish White A-White F-Whitish Yellow G-Yellowish Orange K-Orange Red M-Red


For long-term-memory:
Oh Be A Fine Girl/Guy Kiss Me

Sun belongs to G, with surface temperature in the range #5500^o C - 10000^o C#.

An improved version is 0 - 9 grading;

Based on the width of absorption lines in the star-spectrum::
I II III IV V. This is also called luminosity classification

Sun is in the spectral class G2V, revealing the codes G 2 V in three types of classification