Table 1
Illustrative elemental abundances and depletions for dust-forming elements in the diffuse ISM, based upon the THEMIS dust model (Jones et al. 2017).
| Total | In dust | Dust | Residual | |
|---|---|---|---|---|
| Element | (ppm) | (ppm) | phase | (ppm) |
| O | (490:575) | 110 | a-Sil | (360:445) |
| 20 | a-C(:H)[:O:N] | |||
| N | 79 | 20 | a-C(:H)[:O:N] | 59 |
| C | 390 | 206 | a-C(:H) | 184 |
| Si | 40 | 32 | a-Sil | 8 |
| Mg | 42 | 45 | a-Sil | − 3 |
| Fe | 35 | 19 | Fe,FeS | 16 |
| S | 15 | 3 | FeS | 12 |
Notes. The possible range of O abundances are indicated (490:575, Asplund et al. 2009; Przybilla et al. 2008, respectively). The C abundance is taken from Jenkins (2009) and Parvathi et al. (2012). Otherwise the abundances are from Jenkins (2009) and Palme et al. (2014). As explained in the text, ~ 10% of O and N heteroatoms, relative to carbon, has been included within a-C(:H) mantles.
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