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The role of AGB stars in the evolution of globular clusters

Published online by Cambridge University Press:  30 December 2019

Paolo Ventura ,
Franca D’Antona ,
Marcella Di Criscienzo ,
Flavia Dell’Agli  and
Marco Tailo
Paolo Ventura
Affiliation:
INAF, Observatory of Rome, Via Frascati 33, 00077, Monte Porzio Catone (RM), Italy email: paolo.ventura@inaf.it
Franca D’Antona
Affiliation:
INAF, Observatory of Rome, Via Frascati 33, 00077, Monte Porzio Catone (RM), Italy email: paolo.ventura@inaf.it
Marcella Di Criscienzo
Affiliation:
INAF, Observatory of Rome, Via Frascati 33, 00077, Monte Porzio Catone (RM), Italy email: paolo.ventura@inaf.it
Flavia Dell’Agli
Affiliation:
Instituto de Astrofsica de Canarias, E-38200 La Laguna, Tenerife, Spain Departamento de Astrofsica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
Marco Tailo
Affiliation:
Dipartimento di Fisica e Astronomia “Galileo Galilei”, Universitá di Padova, Vicolo dellOsservatorio 3, I-35122 Padova, Italy
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Abstract

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The results from high-resolution spectroscopy and accurate photometry have challenged the traditional paradigm that stars in globular clusters (GC) are simple stellar populations, rather suggesting that these structures harbor distinct groups of stars, differing in the chemical composition, particularly in the abundances of the light elements, from helium to silicon. Because this behavior is not shared by field stars, it is generally believed that some self-enrichment mechanism must have acted in GC, such that new stellar generations formed from the ashes of stars belonging to the original population. In this review, after presenting the state-of-the-art of the observations of GC stars, we discuss the possibility that the pollution of the intra-cluster medium was provided by the winds of AGB stars of initial mass above ∼3 M⊙. These objects evolve with time scales of 40 − 100 Myr and contaminate their surroundings with gas processed by p-capture nucleosynthesis, in agreement with the chemical patterns traced by GC stars.

Keywords

stars: abundancesstars: AGB and post-AGBstars: evolutionglobular clusters: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 291 - 300
Copyright
© International Astronomical Union 2019 

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