Left panel: WISE color–color diagram that can be used to distinguish O-rich and C-rich AGB stars. Both the W1 − W2 color and W3 − W4 color are computed from the calibrated photometry. Pluses are O-rich stars, while triangles are C-rich stars. The dashed line is calculated to most effectively separate the two types of AGB stars. The solid green curves (left: O-rich, right: C-rich) are a series of models with different optical depths and typical values for the other 3 parameter values. The dash-dotted line is a series of blackbodies for reference. The four blue squares from bottom to top are blackbodies with temperatures of 3500, 2500, 1500, and 500 K, respectively. The middle and right panels show the DUSTY model SEDs with optical depth τ0.55 = 0.01, 1.25, and 80 for O-rich AGB and C-rich AGB, respectively. The dotted curves are the WISE W1 − W4 band relative spectral response functions. The simulated colors of these four models are designated as thick squares in the left panel.
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