Table 3
Column densities and ratios for CH3CCH and its singlyand doubly deuterated species in L483.
| Species | μ (D) (a) | Nlines (e) | Eup (K) (f) | Trot (K) | N (cm−2) (h) | Column density ratio (i) | ||
|---|---|---|---|---|---|---|---|---|
| CH3CCH | 0.7839 (b) | 8 | 11.5–82.3 | 10.2 (g) | 9.10 × 1013 | |||
| CH2DCCH | 0.7850 (c) | 15 | 11.6–43.6 | 10.2 ± 0.7 | (1.76 ± 0.34) × 1013 | CH3CCH/CH2DCCH | 5.2 ± 1.6 | |
| CH3CCD | 0.7698 (d) | 6 | 10.5–20.9 | 10.2 (g) | 5.79 × 1012 | CH3CCH/CH3CCD | 15.7 ± 4.7 | |
| CHD2CCH | 0.7870 (c) | 9 | 11.1–25.0 | 10.2 (g) | 2.69 × 1012 | CH3CCH/CHD2CCH | 33.8 ± 10.1 | |
| CH2DCCD | 0.7711 (c) | 8 | 10.6–25.3 | 10.2 (g) | 2.16 × 1012 | CH3CCH/CH2DCCD | 42.1 ± 12.6 | |
Notes. (a) Dipole moments along the principal axis a. (b) Experimental value from Burrell et al. (1980). (c)Calculated value (this work). (d)Experimental value from Muenter & Laurie (1966) corrected for a more accurate dipole moment of the reference OCS than used by these authors (see text). (e) Number of lines observed. (f) Range of upper level energies of the lines observed. (g)Rotational temperature has been fixed to the value derived for CH2DCCH. (h) Errors in the column densities are estimated to be 20%. (i)Errors in the column density ratios are estimated to be 30%.
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