Interpretation of carbon overabundances in the atmospheres of carbon stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Carbon Stars, Cosmic Dust, Red Giant Stars, Stellar Atmospheres, Stellar Mass Accretion, M Stars, Stellar Evolution, Stellar Models, Stellar Spectra

Scientific paper

An attempt is made to estimate the rate of accretion of interstellar grains by red giants. It seems possible for a red giant traversing dust clouds to acquire, under realistic conditions, an amount of carbon sufficient to turn its spectrum into that of a carbon star. Coarse grains exceeding 0.001 cm in diameter are most effective in this process.

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