2MASS-MSX Ks– A versus A–D diagram of targets. SiO maser detections are marked with blue filled circles and non-detections with blue empty circles. Upper limits and blends have been removed. Identification numbers are as in Table D.2. The dotted line marks the separation between O-rich and C-rich shells found by Ortiz et al. (2005). The long-dashed line represents a blackbody (Fν) with temperature from 2200 to 400 K. New candidate C-type stars from our survey (see text) are labeled. For comparison Ks–A versus A–D values of the carbon stars analyzed by Ortiz et al. (2005) are overplotted with+++ magenta crosses, transitional objects with diamonds, and PNe with triangles.
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