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Using Spitzer IRAC observations from the SAGE-SMC Legacy program and archivedSpitzer IRAC data, we investigate dust production in 47 Tuc, a nearby massiveGalactic globular cluster. A previous study detected infrared excess,indicative of circumstellar dust, in a large population of stars in 47 Tuc,spanning the entire Red Giant Branch (RGB). We show that those results sufferedfrom effects caused by stellar blending and imaging artifacts and that it islikely that no stars below about 1 mag from the tip of the RGB are producingdust. The only stars that appear to harbor dust are variable stars, which arealso the coolest and most luminous stars in the cluster.

Is Dust Forming on the Red Giant Branch in 47 Tuc?