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Fig. C.10

image

CH+/OH+ column density ratio of absorption components vs. bolometric temperature. L 1489 (Class I) has upper limits in both CH+ and OH+, and is not shown. The symbols indicate different types of objects: Red diamonds for Class 0, yellow triangle up for Class I (L 1489), brown circle for intermediate mass, light blue triangle down for high-mass mid-IR quiet (NGC 6334 I(N)), green square for high-mass mid-IR bright and hot molecular core, and dark blue triangle left for high-mass ultra-compact HII (NGC 7538 IRS1).

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