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.7

¹²C/¹³C and isomeric ratios, with the mean and standard deviation values.

Starless core	¹²C/¹³C			Isomers
Starless core	$\frac{H C N}{H^{13} C N}$ $\frac{HCN}{H^{13}CN}$	$\frac{D N C}{D N^{13} C}$ $\frac{DNC}{DN^{13}C}$	$\frac{H N C}{H N^{13} C}$ $\frac{HNC}{HN^{13}C}$	$\frac{H^{13} C N}{H N^{13} C}$ $\frac{H^{13}CN}{HN^{13}C}$	$\frac{H C^{15} N}{H^{15} N C}$ $\frac{HC^{15}N}{H^{15}NC}$	$\frac{D C N}{D N C}$ $\frac{DCN}{DNC}$	$\frac{D C N}{(D N^{13} C \times 68)}$ $\frac{DCN}{(DN^{13}C\times 68)}$
B213-C16-1	−	46 ± 16	2.83 ± 0.40	1.01 ± 0.14	0.68 ± 0.12	0.86 ± 0.29	0.58 ± 0.10
B213-C12-1	−	50 ± 16	4.92 ± 0.70	0.85 ± 0.12	0.41 ± 0.10	0.48 ± 0.13	0.351 ± 0.076
B213-C1-1	20.7 ± 2.9	65 ± 20	4.07 ± 0.58	1.24 ± 0.18	0.96 ± 0.21	0.48 ± 0.15	0.454 ± 0.075
B213-C6-1	−	53 ± 17	2.55 ± 0.36	0.80 ± 0.11	0.43 ± 0.11	0.52 ± 0.19	0.40 ± 0.11
B213-C2-1	−	48 ± 17	3.22 ± 0.46	0.93 ± 0.13	0.98 ± 0.15	−	−
B213-C7-1	−	> 96	4.19 ± 0.61	1.51 ± 0.25	0.74 ± 0.26	2.95 ± 0.79	> 4.15
B213-C10-1	−	82 ± 28	4.46 ± 0.63	0.88 ± 0.13	0.70 ± 0.14	0.61 ± 0.19	0.73 ± 0.14
B213-C5-1	−	> 50	5.77 ± 0.86	0.88 ± 0.15	> 1.38	0.45 ± 0.12	> 0.327
1333-C2-1	38.5 ± 5.4	42 ± 15	6.88 ± 0.98	0.84 ± 0.12	0.71 ± 0.12	0.50 ± 0.14	0.309 ± 0.074
L1448-1	14.2 ± 2.0	36 ± 12	4.94 ± 0.70	2.11 ± 0.30	1.00 ± 0.16	0.92 ± 0.29	0.485 ± 0.072
79-C1-1	22.5 ± 3.2	29.0 ± 8.4	6.24 ± 0.89	0.82 ± 0.12	0.60 ± 0.10	0.84 ± 0.24	0.357 ± 0.053
1333-C3-14	12.5 ± 1.7	52 ± 17	5.48 ± 0.78	1.68 ± 0.24	1.00 ± 0.17	0.191 ± 0.058	0.147 ± 0.026
1333-C4-1	58.3 ± 8.3	51 ± 16	13.3 ± 1.9	2.31 ± 0.33	0.333 ± 0.048	0.79 ± 0.24	0.59 ± 0.10
1333-C7-1	−	34 ± 10	9.8 ± 1.4	0.539 ± 0.077	−	−	−
IC348-10	52.6 ± 8.3	> 55	20.6 ± 2.9	1.65 ± 0.24	1.49 ± 0.24	0.53 ± 0.12	> 0.428
1333-C3-1	25.8 ± 3.7	> 91	18.7 ± 2.7	1.16 ± 0.17	0.92 ± 0.15	1.03 ± 0.28	> 1.39
1333-C1-1	41.4 ± 5.9	> 78	18.1 ± 2.6	1.71 ± 0.24	1.38 ± 0.22	0.77 ± 0.22	> 0.88
ORI-C1-2	24.0 ± 3.4	57 ± 20	14.2 ± 2.0	1.46 ± 0.21	1.25 ± 0.18	0.67 ± 0.18	0.56 ± 0.15
1333-C5-1	41.1 ± 5.8	43 ± 16	14.8 ± 2.1	1.05 ± 0.15	1.15 ± 0.21	0.56 ± 0.14	0.36 ± 0.11
1333-C6-1	39.6 ± 5.6	> 62	16.7 ± 2.4	0.99 ± 0.14	0.81 ± 0.15	0.64 ± 0.16	> 0.585
ORI-C3-1	144 ± 20	> 98	22.6 ± 3.2	1.37 ± 0.19	1.06 ± 0.17	1.21 ± 0.29	> 1.74
IC348-1	39.6 ± 5.6	> 62	23.0 ± 3.3	1.45 ± 0.21	1.02 ± 0.20	0.45 ± 0.12	> 0.412
ORI-C2-3	27.5 ± 3.9	> 106	9.0 ± 1.3	1.24 ± 0.18	1.10 ± 0.17	0.41 ± 0.11	> 0.638
mean	33	49	10.3	1.24	0.89	0.75	0.44
σ	13	13	6.7	0.44	0.30	0.54	0.15

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