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TP-AGB stars in population synthesis models

Published online by Cambridge University Press:  13 April 2010

Paola Marigo ,
Léo Girardi ,
Alessandro Bressan ,
Bernhard Aringer ,
Marco Gullieuszik ,
Enrico V. Held ,
Martin A.T. Groenewegen ,
Laura Silva  and
Gian Luigi Granato
Paola Marigo
Affiliation:
Dept. of Astronomy, University of Padova, Vicolo dell'Osservatorio 3, I-35122 Padova, Italy, email: paola.marigo@unipd.
Léo Girardi
Affiliation:
Astronomical Observatory of Padova, INAF, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Alessandro Bressan
Affiliation:
Astronomical Observatory of Padova, INAF, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Bernhard Aringer
Affiliation:
Astronomical Observatory of Padova, INAF, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy Dept. of Astronomy, University of Vienna, Tuerkenschanzstr. 17, A1180 Vienna, Austria
Marco Gullieuszik
Affiliation:
Astronomical Observatory of Padova, INAF, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Enrico V. Held
Affiliation:
Astronomical Observatory of Padova, INAF, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Martin A.T. Groenewegen
Affiliation:
Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Laura Silva
Affiliation:
Astronomical Observatory of Trieste, INAF, Via Tiepolo 11, I-34131 Trieste, Italy
Gian Luigi Granato
Affiliation:
Astronomical Observatory of Trieste, INAF, Via Tiepolo 11, I-34131 Trieste, Italy
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Abstract

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In spite of its relevance, the Thermally Pulsing Asymptotic Giant Branch (TP-AGB) phase is one of the most uncertain phases of stellar evolution, and a major source of disagreement between the results of different population synthesis models of galaxies. I will briefly review the existing literature on the subject, and recall the basic prescriptions that have been used to fix the contribution of TP-AGB stars to the integrated light of stellar populations. The simplicity of these prescriptions greatly contrasts with the richness of details provided by present-day databases of AGB stars in the Magellanic Clouds, which are now being extended to other nearby galaxies. I will present the first results of an ongoing study aimed at simulating photometry, chemistry, pulsation, mass loss, dust properties of AGB star populations in resolved and un-resolved galaxies. We test our predictions against observations from various surveys of the Magellanic Clouds (DENIS, 2MASS, OGLE, MACHO, Spitzer, and AKARI). I will discuss the implications and outline the plan of future developments.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 36 - 43
Copyright
Copyright © International Astronomical Union 2010

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