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Surface brightness fluctuations, tracers of stellar mass-loss?

Published online by Cambridge University Press:  13 April 2010

Rosa A. González-Lópezlira ,
Gustavo Bruzual-A. ,
Stéphane Charlot ,
Javier Ballesteros-Paredes  and
Laurent Loinard
Rosa A. González-Lópezlira
Affiliation:
Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apdo. Postal 72-3 (Xangari), Morelia, Michocán 58089, México email: r.gonzalez@crya.unam.mx
Gustavo Bruzual-A.
Affiliation:
Centro de Investigaciones de Astronomía, Apartado Postal 264, Mérida 5101-A, Venezuela
Stéphane Charlot
Affiliation:
Institut d'Astrophysique de Paris, 98bis, bd Arago - 75014 Paris, France
Javier Ballesteros-Paredes
Affiliation:
Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apdo. Postal 72-3 (Xangari), Morelia, Michocán 58089, México email: r.gonzalez@crya.unam.mx
Laurent Loinard
Affiliation:
Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apdo. Postal 72-3 (Xangari), Morelia, Michocán 58089, México email: r.gonzalez@crya.unam.mx
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Abstract

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We present optical and IR integrated colors and SBF magnitudes, computed from stellar population synthesis models that include emission from the dusty envelopes surrounding mass-loosing TP-AGB stars. We explore the effects of varying the mass-loss rate by one order of magnitude around the fiducial value, modifying accordingly both the stellar parameters and the output spectra of the TP-AGB stars plus their dusty envelopes. We compare these models to optical and near-IR data of single AGB stars and Magellanic star clusters. Neither broad-band colors nor SBF measurements in the optical or the near-IR can discern global changes in the mass-loss rate of a stellar population. However, we predict that mid-IR SBF measurements can pick out such changes, and actually resolve whether a relation between metallicity and mass-loss exists.

Keywords

stars: AGB and post–AGB — stars: carbon — stars: mass loss — Magellanic Clouds — infrared: stars — stars: circumstellar matter — stars: evolution — galaxies: evolution — galaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 48 - 51
Copyright
Copyright © International Astronomical Union 2010

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