Luminosity and carbon enhancement in N-type carbon stars

Astronomy and Astrophysics – Astrophysics

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Abundance, Carbon Stars, Cn Emission, Stellar Luminosity, Stellar Structure, Oxygen Spectra, Stellar Evolution

Scientific paper

Recent observational data indicate the likelihood of a relation between luminosity and carbon enhancement in N-type irregularly variable carbon stars in the sense that the more luminous carbon stars appear to have smaller enhancements of carbon. No relation appears between carbon enhancement and red colors. The observational data are the luminosities of Peery (1975), the colors and CN band indices of Baumert (1972), the CO indices of Fay and Ridgway (1976), and the C2 indices of Gow (1977).

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