Barium star

Rarity: Uncommon

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What Wikipedia says

Barium stars are spectral class G to K stars whose spectra indicate an overabundance of s-process elements by the presence of singly ionized barium, Ba II, at λ 455.4 nm. Barium stars also show enhanced spectral features of carbon, the bands of the molecules CH, CN and C2.

Excerpt from the Wikipedia article “Barium star”, under the CC BY-SA 4.0 license. Read the article on Wikipedia