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Stellar classification
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====Classes MS and SC: Intermediate carbon-related classes==== In between the M and S classes, border cases are named MS stars. In a similar way, border cases between the S and C-N classes are named SC or CS. The sequence M β MS β S β SC β C-N is hypothesized to be a sequence of increased carbon abundance with age for [[carbon star]]s in the [[asymptotic giant branch]].
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