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12C/13C Ratios and Li Abundances in Low-Mass C Stars

Published online by Cambridge University Press:  25 May 2016

Carlos Abia  and
Jordi Isern
Carlos Abia
Affiliation:
Dpto. Física Teórica y del Cosmos Universidad de Granada, 18071 Granada, Spain
Jordi Isern
Affiliation:
Centre d'Estudis Avançats de Blanes (CSIC) 18032 Blanes, Spain

Abstract

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High-resolution and high signal-to-noise-ratio spectroscopy is used to derive 12C/13C ratios from the Red System of the CN molecule at 8000 Å in several galactic low-mass C stars previously analyzed for lithium. It is found that Li-rich C stars usually have low isotopic ratios (< 15). This suggests that the Li and 13C enrichments in C stars might be produced by a similar mechanism. However, due to the large uncertainties in the abundance derivations for both Li and carbon isotope ratios, this result must be confirmed with further studies.

Type
Session II — Models and Abundance Determinations
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 89 - 95
Copyright
Copyright © Kluwer 2000 

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