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Table 5

Column density values for CO2, CO, H2O, CH3OH and NH3 along the line of sight to selected young stellar objects and a field star.

Source N(CO2)total N(CO)solida N(H2O) N(CH3OH) N(NH3)b References
IRAS 13546 -3941 8.72 ± 0.12 ... 20.7 ± 2.0 <0.8 ± 0.1 0.94 ± 0.16 1, 2, 3
CED 110 IRS 4 12.26 ± 0.12 ... ... ... ... 2
CED 110 IRS 6 14.30 ± 0.08 ... 47.0 ± 6.0 ... ... 2
CrA IRAS 32 18.70 ± 0.21 ... 52.6 ± 18.8 <9.5 ± 3.4 5.44 c 1, 2, 3
CrA IRS 7A 19.64 ± 0.12 14.7 ± 1.1 108.9 ± 19.2 <4.1 ± 0.7 0.97c 1, 2, 3, 4
R CrA IRS 5 14.28 ± 0.13 ... 35.8 ± 2.6 2.4 ± 0.6 0.91 ± 0.23 1, 2, 3
HH 46 IRS (IRAS 08242 -5050) 21.58 ± 0.11 15.8 ± 1.2 77.9 ± 7.7 4.3 ± 0.5 4.77 ± 0.46 1, 2, 3
RNO 91 (IRAS 16316 -1540) 11.66 ± 0.16 8.0 ± 0.3 42.5 ± 3.6 <2.4 ± 0.2 2.03 ± 0.30 1, 2, 3, 4
IRAS 03254 +3050 8.86 ± 0.10 3.1 ± 1.0 36.6 ± 4.7 <1.7 ± 0.2 2.44 ± 0.39 1, 2, 3
IRAS 03271 +3013 15.37 ± 0.09 5.5 ± 2.7 76.9 ± 17.6d <3.3 ± 0.8 4.90 ± 0.88 1, 2, 3
IRAS 03439 +3233 (B5 IRS 3) 3.32 ± 0.06 2.9 ± 0.9 10.1 ± 0.9 <0.8 ± 0.1 0.31c 1, 2, 3
IRAS 03445 +3242 (B5 IRS 1) 7.07 ± 0.09 11.5 ± 1.3 22.6 ± 2.8 <0.8 ± 0.1 0.47c 1, 2, 3
RNO 15 (IRAS 03247 +3001) 2.57 ± 0.05 3.5 ± 0.5 6.9 ± 0.6 0.8 ± 0.2 0.80 ± 0.21e 1, 2, 3
CRBR 2422.8 -3423 10.54 ± 0.06 31.2 ± 3.3 41.9 ± 4.1 <3.9 ± 0.4 0.52c 1, 2, 3, 4
GSS 30 IRS I 3.28 ± 0.06 1.3 ± 0.4 15.3 ± 3.0 ... ... 2, 4
IRS 37 4.05 ± 0.08 3.9 ± 0.4 36.5 ± 5.0 ... ... 2
IRS 42 4.49 ± 0.05 4.1 ± 0.1 19.5 ± 2.0 ... ... 2, 4
IRS 43 12.26 ± 0.12 12.0 ± 0.3 31.5 ± 4.0 ... ... 2, 4
IRS 44 6.92 ± 0.08 3.2 ± 0.5 34.0 ± 4.0 ... ... 2, 4
IRS 51 9.32 ± 0.07 31.9 ± 0.9 22.1 ± 3.0 ... ... 2, 4
IRS 63 6.84 ± 0.05 14.3 ± 0.3 20.4 ± 3.0 ... ... 2, 4
WL 6 9.33 ± 0.08 8.01; 13.7 ± 0.72 41.7 ± 6.0 ... ... 2, 4, 5
WL 12 4.34 ± 0.05 3.31; 6.1 ± 0.42 22.1 ± 3.0 ... ... 2, 4, 5
WL 20 S 5.02 ± 0.06 ... ... ... ... 2
EC 88 (SVS 4-5) 17.21 ± 0.10 27.4 ± 4.1 56.5 ± 11.3 14.2 ± 3.5 ~2.4 1, 2, 3, 4
EC 90 (CK 1, SVS 20) 5.44 ± 0.05 6.54 16.9 ± 1.6 1.2 ± 0.3 0.67 ± 0.20 1, 2, 3, 5
EC 92 (SVS 4-10) 8.25 ± 0.05 ... 16.9 ± 1.4 1.9 ± 0.3 ~0.5 1, 2, 3
EC 118 (CK 2) 11.93 ± 0.21 12.61; 34.5 ± 3.42 35.7 ± 3.5 <0.7 ... 2, 3, 4, 6
L 1489 IRS (IRAS 04016 +2610) 16.20 ± 0.09 6.0 ± 0.3 3; 9.0 ± 0.32 42.6 ± 5.1 2.1 ± 0.7 2.31 ± 0.30 1, 2, 3, 4, 7
DG Tau B 5.40 ± 0.06 2.8 ± 0.9 22.9 ± 3.9 <1.3 ± 0.2 0.47 c 1, 2, 3, 4

Notes.All column densities are in 1017 molecules cm-2.

(a)

The CO column density is calculated in this paper according to Pontoppidan et al. (2003, 2008). They use a phenomenological decomposition of the CO stretching vibration mode profile into three components: a CO:H2O (red) component, a CO pure (middle) component and a CO:CO2 (blue) component.

(b)

Uncertainties are statistical errors from the Gaussian fit, while absolute errors are up to a factor of 2.

(c)

Values are 3σ upper limits.

(d)

The 13 μm H2O libration mode is used for NH2O determination. The 3 μm band is usually used in the other cases.

(e)

Values are likely upper limits.

(1)

Chiar et al. (1995).

(2)

As calculated in this paper according to Pontoppidan et al. (2003).

(3)

Teixeira et al. (1998).

(4)

As calculated by Eiroa & Hodapp (1989) and according to d’Hendecourt & Allamandola (1986).

Reference. (1) Bottinelli et al. (2010); (2) Pontoppidan et al. (2008); (3) Boogert et al. (2008); (4) Pontoppidan et al. (2003);  (5) Chiar et al. (1995);  (6) Knez et al. (2008);  (7) Teixeira et al. (1998).

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