Table 9
Abundances with respect to 
. The lines of CH3OH are probably optically thick, and thus the listed abundances with respect to it are considered as upper limits.
| Species | L1551 IRS 5 N | L1551 IRS 5 S | Haro 5a IRS | V346 Nor | OO Ser | ||
|---|---|---|---|---|---|---|---|
| Isotopolog | CH3OH(a) | 13CH3OH(b) | CH318OH(c) | CH3OH | CH3OH | CH3OH | CH3OH |
| CH3CHO | <5.02 × 10−3 | 2.38 × 10−3 | 1.44 × 10−3 | – | <1.35 × 10−1 | <1.06 × 10−2 | <2.59 × 10−2 |
| CH3OCH3 | <2.13 × 10−2 | 1.01 × 10−2 | 6.13 × 10−3 | <1.71 × 10−1 | <5.60 × 10−1 | <5.39 × 10−2 | <9.25 × 10−2 |
| CH3OCHO | <3.16 × 10−2 | 1.49 × 10−2 | 9.07 × 10−3 | <1.40 × 10−1 | <3.75 × 10−1 | <3.76 × 10−2 | <1.25 × 10−1 |
| CH3COCH3 | <6.88 × 10−3 | 3.25 × 10−3 | 1.98 × 10−3 | – | – | – | <7.76 × 10−2 |
| C2H5OH | <2.12 × 10−2 | 1.00 × 10−2 | 6.09 × 10−3 | – | – | – | – |
| C2H5CN | <5.53 × 10−4 | 2.62 × 10−4 | 1.59 × 10−4 | – | – | <1.40 × 10−3 | – |
| CH3CN(d) | <1.16 × 10−2 | 5.49 × 10−3 | 3.34 × 10−3 | <1.00 × 10−1 | – | – | |
Notes. (a)Using the column density obtained from the high-excitation fit.(b)Assuming an isotopic ratio of [12C]/[13C] = 68.(c)Assuming an isotopic ratio of [16O]/[18O] = 560. (d)The column density of CH3CN was calculated from our best-fit N of 13CH3CN and assuming an isotopic ratio of [12C]/[13C] = 68.
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