Table 1
Partition of the elemental abundances in the gas phase and in the grain mantles, as adopted when specifying the initial composition of the gas, prior to its evolution to chemical steady state.
| Element | Total | Volatile | Refractory | |
|---|---|---|---|---|
| Gas | Mantles(§) | |||
| H | 1.0 | 1.0 | ||
| D | 1.60(–5) | |||
| He | 1.00(–1) | 1.00(–1) | ||
| C | 3.55(–4) | 8.27(–5) | 5.55(–5) | 2.17(–4) |
| N | 7.94(–5) | 6.39(–5) | 1.55(–5) | |
| 15N (†) | 2.41(–7) | 1.94(–7) | 4.70(–8) | |
| O | 4.42(–4) | 1.24(–4) | 1.78(–4) | 1.40(–4) |
| S | 1.86(–5) | 6.00(–7) | 1.82(–5) | |
| Mg | 3.70(–5) | 3.70(–5) | ||
| Si | 3.37(–5) | 3.37(–5) | ||
| Fe | 3.23(–5) | 1.50(–9) | 3.23(–5) | |
Notes. Numbers in parentheses are powers of 10. Abundances are expressed relative to the hydrogen nuclei density, nH. (§) The initial composition of the mantles can be found in Table 3 of Paper I. (†) The isotopic ratio of bulk nitrogen is the adopted present-day value 
= 330.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.