Clues for Lithium Production in Galactic C Stars: The 12C/13C Ratio

Details Clues for Lithium Production in Galactic C Stars: The 12C/13C Ratio Clues for Lithium Production in Galactic C Stars: The 12C/13C Ratio

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...460..443a&link_type=abstract

Astrophysical Journal v.460, p.443

Astronomy and Astrophysics

Astronomy

23

Stars: Abundances, Stars: Carbon, Stars: Agb And Post-Agb

Scientific paper

High-resolution spectroscopy is presented for 11 Population I Galactic carbon stars (C stars). Carbon isotopic ratios (12C/13C) and lithium abundances are derived from LTE synthetic spectra. It is found that the 13C-rich stars are also Li-rich. We argue that the Li and 13C enrichment in Galactic C stars might be produced by a similar mechanism. Evidence of the operation of hot bottom burning (HBB) is found in the 13C-rich stars. However, theoretical models for asymptotic giant branch stars do not predict the simultaneous existence of HBB and Li production in stars with initial masses M ˜2 Msun, which is the typical initial mass of the stars analyzed here. We briefly discuss the observations in terms of the current models for C stars.

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