Fig. 7.
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Left: Near-IR (J − H) vs. (H − Ks) color-color diagram of known sgB[e] (open squares), warm hypergiants (open triangles), cBe stars (open circles), known S Dor variables (blue dots), BSgs (small dots), and [ST92] 4-13, HD 269216 (red asterisks). Data taken from Humphreys et al. (2017b). The dashed red line is the main-sequence locus. Right: Mid-IR [3.6 μm]–[4.5 μm] vs. [5.8 μm]–[8.0 μm] color-color diagram.
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