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The OBAFGKM sequence

The OBAFGKM sequence

Infographic of the stellar spectral sequence O B A F G K M from hottest to coolest, with colour change from blue to red, temperature ranges, and key absorption features labelled

Stars are placed into spectral classes according to the pattern of absorption lines in their spectra. The main A-level sequence is O, B, A, F, G, K, M from hottest to coolest.

Principles of the use of stellar spectral classes (A-level only) Lesson

  1. A Level
  2. /Physics
  3. /Principles of the use of stellar spectral classes (A-level only)