# The first 8–13 μm spectra of globular cluster red giants: circumstellar silicate dust grains in 47 Tucanae (NGC 104)

@article{Loon2006TheF8,
title={The first 8–13 $\mu$m spectra of globular cluster red giants: circumstellar silicate dust grains in 47 Tucanae (NGC 104)},
author={Jacco Th. van Loon and Iain McDonald and Joana Marques Oliveira and Aneurin Evans and Martha L. Boyer and Robert D. Gehrz and Elisha F. Polomski and Charles E. Woodward},
journal={Astronomy and Astrophysics},
year={2006},
volume={450},
pages={339-343}
}
We present 8–13 µm spectra of eight red giants in the globular cluster 47 Tucanae (NGC 104), obtained at the European Southern Observatory 3.6 m telescope. These are the first mid-infrared spectra of metal-poor, low-mass stars. The spectrum of at least one of these, namely the extremely red, large-amplitude variable V1, shows direct evidence of circumstellar grains made of amorphous silicate.

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