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What are carbon stars? How do they form?

Carlos Ciscato, São Paulo, Brazil
Stars-in-Milky-Way
Close-up of stars in the Milky Way Galaxy.
NASA and H. Richer (University of British Columbia)
But some cool stars have different spectra, dominated by carbon-containing molecules, such as CH, CN, and C2. These spectral features signal a rare condition in which carbon is more abundant than oxygen, which is why these objects are called carbon stars.

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