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arxiv: astro-ph/0601074 · v1 · submitted 2006-01-04 · 🌌 astro-ph

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

Jacco Th. van Loon (Keele University , UK) , Iain McDonald (Keele) , Joana M. Oliveira (Keele) , A. Evans (Keele) , Martha L. Boyer (University of Minnesota , USA) , Robert D. Gehrz (Minnesota)
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Elisha Polomski (Minnesota) Charles E. Woodward (Minnesota)
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classification 🌌 astro-ph
keywords spectracircumstellarclusterfirstgiantsglobulargrainsmicron
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We present 8-13 micron spectra of eight red giants in the globular cluster 47 Tucanae (NGC 104), obtained at the European Southern Observatory 3.6m 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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