Open Access

Table 2

Steady-state abundances and 14N:15N isotopic ratios, as calculated for our reference model (see Sect. 2.3).

Species Abundance (†) TH00 R15
N 1.3(–05) 436 337
N2 2.5(–05) 309 327
NH3 1.6(–08) 387 364
CN 8.2(–09) 402 335
NO 4.7(–07) 410 335
HCN 4.1(–09) 345 343
N2H+ 9.1(–10) 288 (1) 324 (1)
N2H+ 9.1(–10) 265 (2) 317 (2)

Notes. The bulk isotopic ratio 14N:15N is = 330. Numbers in parentheses are powers of 10. (†)Expressed relative to nH. (1) N2 H + /15NNH+. (2) N2 H + /N15NH+.

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.