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CN star

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The excess strength of the CN bands is classified by a positive index with increments of 0.5. A value of zero indicates a normal star and is not listed in the stellar class, while the peak value of 4 is essentially similar to a carbon star. Stars classified in the MK system with a CN suffix are considered "strong" CN stars. Hence, 42 Librae is a strong CN star with a class of K3-III CN2. A value of 0.5 is also termed a marginal CN star, which corresponds to the typical giant stars in the Hyades cluster.

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