Spectral star classification. Comparison of the visible light spectra (400-700 nanometres,rainbow bands) of 13 types of stars. The types (from top to bottom) are O6.5,B0,B6,A1,A5,F0,F5,G0,G5,K0,K5,M0,M5. Our Sun is a G2-type star. The order OBAFGKM ranks the stellar spectral types in order of decreasing surface temperature,while the numbers 0-9 provide sub-types. An O-type would be hotter than 25,000 Kelvin (K) and appear blue. An M-type would appear red and be cooler than 3500K. The dark spectral bands show stellar composition | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / National Optical Astronomy Observatories |
Taille de l’image : | 2150 px × 1152 px |
Model Release : | Non requis |
Property Release : | Non requis |
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