Spectral type

In astronomy, the term spectral type refers to the stellar magnitude of a star based on its temperature and color.

The sun Sigma Draconis was classified with a spectral type of Gamma 9. 

Classification
The traditional classification scheme from hottest to coolest stars is:


 * O-type star (blue in color) – FGC 1215 B, Mintaka A
 * B-type star (blue-white to blue in color) – Vandor, Rigel
 * In real life, unlike Vandor, no red giant can actually belong to type B, as B-type stars are exclusively blue or blue-white.


 * A-type star (white to bluish white)– FGC 1215 A, Vega, Sirius
 * F-type star (white)– Orellius Minor, Canopus
 * G-type star (yellow) – Calindra, Hemikek, Sol
 * K-type star (Orange in color) – Alpha Centauri B, Arcturus, Aldebaran
 * M-type star (Red in color, includes red dwarf, red giant) – Proxima Centauri, 40 Eridani A, Betelgeuse

External link


Spektralklasse Type spectral スペクトル型 Spectrale klasse