Fractionation in young cores: Direct determinations of nitrogen and carbon fractionation in HCN

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Table 4

Estimated column densities derived using the direct method.

Source	N(H¹³CN) (10¹² cm⁻²)	N(HC¹⁵N) (10¹¹ cm⁻²)	N(HCN) (10¹³ cm⁻²)	¹⁴N/¹⁵N	¹²C/¹³C
CB23	2.1±0.4	3.2±0.5	8±2	235±58	36±10
TMC2	2.3±0.2	3.2±0.6	15±3	461±130	63±15
L1512	7.9±0.9	6.5±0.8	16±4	251 ±76	20±7
L1495	6.1±0.8	8±1	20±5	197±61	25±10
L1517B	4.4±0.3	3.9±0.4	11±4	280±85	25±8

Notes. Uncertainties are propagated from the 25% and 75% percentiles of the MCMC chains.

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