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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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