Series principalis est classificatio stellarum in Diagrammate Hertzsprung-Russell qua stabliter hydrogenium in helio struens per fusionem nuclearis.
Classes series principalis est O, B, A, F, G, K, M, L, T in ordine. M et L et fusores et non-fusores habent. Non-fusores, sive pumiliones fuscae, energia sola a contractione trahitur.
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