Gas phase Elemental abundances in Molecular cloudS (GEMS) - XI. The evolution of HCN, HNC, and N2H+ isotopic ratios in starless cores

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Volume 700 (August 2025)

A&A, 700 (2025) A226

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Table A.8

Deuterium fraction ratios, with the mean and standard deviation values.

Starless core	$\frac{D N C}{(H N^{13} C \times 68)}$ $\frac{DNC}{(HN^{13}C\times 68)}$	$\frac{D N C}{H N C}$ $\frac{DNC}{HNC}$	$\frac{D N^{13} C}{H N^{13} C}$ $\frac{DN^{13}C}{HN^{13}C}$	$\frac{D C N}{(H^{13} C N \times 68)}$ $\frac{DCN}{(H^{13}CN\times 68)}$	$\frac{D C N}{H C N}$ $\frac{DCN}{HCN}$	$\frac{N_{2} D^{+}}{N_{2} H^{+}}$ $\frac{N_2D^+}{N_2H^+}$
Starless core	B213-C16-1	0.06 ± 0.02	1.4 ± 0.5	0.09 ± 0.01	0.051 ± 0.007		0.27 ± 0.04
B213-C12-1	0.04 ± 0.01	0.5 ± 0.1	0.05 ± 0.01	0.021 ± 0.003		0.054 ± 0.008
B213-C1-1	0.09 ± 0.03	1.4 ± 0.4	0.09 ± 0.01	0.034 ± 0.005	0.11 ± 0.02	0.41 ± 0.06
B213-C6-1	0.10 ± 0.03	2.5 ± 0.8	0.12 ± 0.02	0.06 ± 0.02		0.36 ± 0.05
B213-C2-1	0.06 ± 0.01	1.2 ± 0.3	0.08 ± 0.02			0.10 ± 0.02
B213-C7-1	0.09 ± 0.02	1.4 ± 0.4	< 0.060	0.16 ± 0.03		0.13 ± 0.02
B213-C10-1	0.06 ± 0.02	0.9 ± 0.3	0.05 ± 0.01	0.043 ± 0.006		0.13 ± 0.02
B213-C5-1	0.06 ± 0.02	0.7 ± 0.2	< 0.09	0.032 ± 0.005		0.12 ± 0.02
1333-C2-1	0.05 ± 0.01	0.5 ± 0.1	0.08 ± 0.02	0.031 ± 0.004	0.055 ± 0.008	0.09 ± 0.01
L1448-1	0.06 ± 0.02	0.9 ± 0.3	0.12 ± 0.02	0.027 ± 0.004	0.13 ± 0.02	0.35 ± 0.05
79-C1-1	0.07 ± 0.02	0.8 ± 0.2	0.17 ± 0.03	0.07 ± 0.01	0.22 ± 0.03	0.26 ± 0.04
1333-C3-14	0.05 ± 0.01	0.6 ± 0.2	0.06 ± 0.01	(5.53 ± 0.78) 10⁻³	0.030 ± 0.004	0.15 ± 0.02
1333-C4-1	0.06 ± 0.02	0.30 ± 0.09	0.08 ± 0.01	0.020 ± 0.003	0.023 ± 0.003	0.23 ± 0.03
1333-C7-1	0.06 ± 0.01	0.4 ± 0.1	0.11 ± 0.02
IC348-10	0.021 ± 0.005	0.07 ± 0.02	< 0.026	(6.69 ± 0.95) 10⁻³	(8.70 ± 1.20) 10⁻³	0.016 ± 0.003
1333-C3-1	0.038 ± 0.009	0.14 ± 0.03	< 0.028	0.034 ± 0.006	0.09 ± 0.02	0.030 ± 0.004
1333-C1-1	0.06 ± 0.02	0.23 ± 0.07	< 0.054	0.028 ± 0.004	0.046 ± 0.006	0.10 ± 0.01
ORI-C1-2	0.04 ± 0.01	0.20 ± 0.05	0.05 ± 0.01	0.019 ± 0.003	0.053 ± 0.007
1333-C5-1	0.027 ± 0.006	0.12 ± 0.03	0.04 ± 0.01	0.015 ± 0.002	0.024 ± 0.004	0.056 ± 0.008
1333-C6-1	0.06 ± 0.02	0.25 ± 0.06	< 0.067	0.040 ± 0.006	0.068 ± 0.010	0.14 ± 0.02
ORI-C3-1	0.017 ± 0.004	0.05 ± 0.01	< 0.011	0.015 ± 0.002	(6.87 ± 0.97) 10⁻³	0.016 ± 0.002
IC348-1	0.05 ± 0.01	0.14 ± 0.04	< 0.050	0.014 ± 0.001	0.025 ± 0.003	0.12 ± 0.01
ORI-C2-3	0.04 ± 0.01	0.32 ± 0.09	< 0.027	0.014 ± 0.001	0.034 ± 0.004	0.051 ± 0.007
mean	0.054	0.65	0.085	0.036	0.061	0.15
σ	0.019	0.59	0.034	0.033	0.055	0.11

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