JOYS+ study of solid-state 12C/13C isotope ratios in protostellar envelopes - Observations of CO and CO2 ice with the James Webb Space Telescope

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Table 1

Band strengths of CO₂ and CO ice.

Position (µm)		A (cm molecule⁻¹)	Correction factor	References
2.70	$A_{12 {CO}_{2}}$ ${{\rm{A}}_{12{\rm{C}}{{\rm{O}}_2}}}$	2.1 × 10⁻¹⁸	1.4	Gerakines et al. (1995) (corrected)
4.27	$A_{12 {CO}_{2}}$ ${{\rm{A}}_{12{\rm{C}}{{\rm{O}}_2}}}$	1.1 × 10⁻¹⁶	1.45	Gerakines et al. (1995) (corrected)
15.2	$A_{12 {CO}_{2}}$ ${{\rm{A}}_{12{\rm{C}}{{\rm{O}}_2}}}$	1.6 × 10⁻¹⁷	1.45	Gerakines et al. (1995) (corrected)
4.39	$A_{13 {CO}_{2}}$ ${{\rm{A}}_{13{\rm{C}}{{\rm{O}}_2}}}$	1.15 × 10⁻¹⁶	1.47	Gerakines et al. (1995) (corrected)

2.35	A_12CO	2.1 × 10⁻¹⁹	1.31	Gerakines et al. (2005) (corrected)
4.67	A_12CO	1.4 × 10⁻¹⁷	1.27	Gerakines et al. (1995) (corrected)
4.78	A_13CO	1.7 × 10⁻¹⁷	1.31	Gerakines et al. (1995) (corrected)

Notes. The corrected values of Gerakines et al. (1995, 2005) were taken from Bouilloud et al. (2015). The column densities derived in this work can be multiplied by the correction factors to compare them with the values derived using the band strengths reported in Gerakines et al. (1995) and Gerakines et al. (1995).

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