VLT/ISAAC infrared spectroscopy of embedded high-mass YSOs in the Large Magellanic Cloud: Methanol and the 3.47 μm band

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Table 6

Optical depths of the water ice and the 3.47 μm absorption bands for Galactic high-mass YSOs.

Object	τ _{3.05 μm}	τ _{3.47 μm}

S140 IRS 1	1.12^a	0.027^b
Mon R2 IRS 2	1.77^a	0.083^c
Mon R2 IRS 3	1.12^a	0.036^c
RAFGL989	1.34⁺	...
RAFGL2136	2.73⁺	0.14^c
RAFGL2591	0.74^a	0.045^c
RAFGL7009S	6.75⁺	...
W33 A	7.50⁺	>0.29^c
NGC 7538 IRS1	1.27^a	0.052^b
NGC 7538 IRS9	3.83⁺	0.13^c
Orion BN	1.44^a	0.034^b
Orion IRC2	1.48^a	...
W3 IRS 5	3.37⁺	0.13^b

Notes. References:

⁽⁺⁾

Optical depths of the H₂O ice are calculated based on the corresponding column densities in Table 5 assuming Δν = 335 cm^-1 and A = 2.0 × 10^-16 cm molecule^-1.

^(a)

Gibb et al. (2004);

^(b)

Brooke et al. (1996);

^(c)

Brooke et al. (1999).

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