Classification systems
Henry Draper catalog
Henry Draper catalogue
O stars
Spectral classification
Spectra classification
Stellar spectrum classification
Stellar spectral classification
Spectral type
Spectrum classification
Morgan-Keenan classification
A stars
G stars
F stars
OB stars
B stars
Wolf-Rayet stars
M stars
K stars
The systematic grouping of stars and stellar objects into categories on the basis of physical, morphological, or evolutionary characteristics.
Stellar classification