Table 1
Model dust compositions based on the optEC(s)(a) data and the dust observables.
| Material | Typical radius [nm] | Eg(bulk) [eV] | Eg(eff.) [eV] | FUV | UV bump | vis.-NIR | EBs | 3.4 μm abs. | IR-mm |
|
|
|||||||||
| a-C | <1 | 0.1 | >0.8 | • | • | × | • | × | × |
| a-C | 1–5 | 0.1 | 0.1–0.8 | • | • | ° | ° | × | × |
| a-C | 5–20 | 0.1 | 0.1 | ° | ° | ° | × | × | ° |
| a-C:H/a-C | 100–200 | 2.5/0.1 | 2.5/0.1 | × | × | ° | × | • | • |
| a-SilFe/a-C | 100–200 | ~8/0.1 | ~8/0.1 | × | × | • | × | × | • |
Notes. 1. The materials for core/mantle particles are indicated as such in Col. 1. 2. The symbols •, ° and × indicate major, minor and no contributions to the observed, FUV extinction, UV bump at 217 nm, visible-NIR extinction, emission bands (EBs), 3.4 μm absorption and IR-mm continuum emission. 3. The outer surfaces of the a-C:H grains are UV photo-processed (into a-C) to a depth of 20 nm (see Paper II). 4. The accreted and UV photo-processed a-C mantle on the amorphous silicates is 5 nm thick. 5. The relative contributions of the small a-C particles to the UV bump and FUV extinction depend on the size distribution (see Sects. 6.2.1 and 6.2.2).
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