Stellar library of AGB stars: isotopic C abundances using APOGEE

A. Manchado1,2,3* and D. A. García-Hernández1
11Instituto de Astrofísica de Canarias, Vía Láctea s/n, La Laguna, E-38205, Spain
2Departamento de Astrof´ısica, Universidad de La Laguna, La Laguna, E-38205, Spain
3Consejo Superior de Investigaciones Científicas, E-28006 Madrid, Spain

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Abstract

We present an ongoing project to obtain a stellar library for evolved Asymptotic Giant Branch (AGB) stars with different isotopic C abundances. Thousands of AGB stars will be observed with APOGEE (H band) in the next three years. The H-band spectra cover the 12CO and 13CO bands and the isotopic 12C/13C ratios will be derived. This database will be useful for the study of nucleosynthesis of evolved AGB stars (e.g., deep mixing or Hot Bottom Burning) as well as to study the gradients of these isotopes along the Galaxy.

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Keywords : AGB – nucleosynthesis – spectroscopy