Surface brightness fluctuations, tracers of stellar mass-loss?

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Agb And Post–Agb — Stars: Carbon — Stars: Mass Loss — Magellanic Clouds — Infrared: Stars — Stars: Circumstellar Matter — Stars: Evolution — Galaxies: Evolution — Galaxies: Stellar Content

Scientific paper

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.

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