Top: run of the brightness temperature of α Cen A, where the solid blue line is a fit through the data points around the temperature minimum, and the dashed blue line is the stellar blackbody extrapolation. The excess beyond 300 μm is presumed to originate in higher chromospheric layers (e.g. De la Luz et al. 2013). Bottom: SED of α Cen A scaled to the distance of 10 pc. The dashed black curve is the difference between the black body extrapolation (dashed blue line) and the Tmin-fit (solid blue line). The solid black curve is the emission of the fitted 53 K dust ring.
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