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Dust production among post-main-sequence stars is investigated in theGalactic globular cluster 47 Tucanae (NGC 104) based on infrared photometry andspectroscopy. We identify metallic iron grains as the probable dominant opacitysource in these winds. Typical evolutionary timescales of AGB stars suggest themass-loss rates we report are too high. We suggest that this is because theiron grains are small or elongated and/or that iron condenses more efficientlythan at solar metallicity. Comparison to other works suggests metallic iron isobserved to be more prevalent towards lower metallicities. The reasons for thisare explored, but remain unclear. Meanwhile, the luminosity at which dusty massloss begins is largely invariant with metallicity, but its presence correlatesstrongly with long-period variability. This suggests that the winds of low-massstars have a significant driver that is not radiation pressure, but may beacoustic driving by pulsations.

Dust production and mass loss in the Galactic globular cluster 47 Tucanae