Invited review presented at the Meeting "Why galaxies care about AGB stars", held in Vienna August 7-11 2006; F. Kerschbaum, C. Charbonnel, B. Wing eds, ASP Conf.Ser. in press.
astro-ph/0701062

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AGB STARS AND THE CHEMICAL EVOLUTION OF GALAXIES

Monica Tosi


INAF - Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy


Abstract. Asymptotic Giant Branch (AGB) stars are important players in the chemical evolution modelling of galaxies, because they are major producers of several chemical elements and excellent tracers of the structure and of the star formation activity of their parent galaxies. A few examples on the importance of AGB stars are presented in this review, together with a number of open problems affecting chemical evolution model predictions related to the element enrichment by AGB stars: the evolution of 4He and Na in globular clusters, the evolution of 3He and the carbon isotopes in the Galactic disk, and the evolution of N and O in different types of galaxies. The need of homogeneous and complete sets of yields is emphasized.


Table of Contents

INTRODUCTION

AGB STARS AS ISM POLLUTERS: 4He, Na AND THE EVOLUTION OF GLOBULAR CLUSTERS

AGB STARS AS ISM POLLUTERS: 3He, 12C and 13C

AGB STARS AS ISM POLLUTERS: NITROGEN VERSUS OXYGEN

THE NEED FOR IMPROVED YIELDS

REFERENCES

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