Table 7
Molecular fractional abundances.
| Molecule | X/H2 | |||
|---|---|---|---|---|
| 15194–5115 | 15082–4808 | 07454–7112 | IRC +10216 | |
| SiO | 4.0(−6) | 1.8(−6) | 4.6(−6) | 1.7(−7)(1) |
| 29SiO | 1.6(−7) | 5.2(−8) | 1.4(−7) | 1.0(−8)(b) |
| 30 SiO | 3.8(−8) | 6.5(−9)(a) | 2.3(−8)(a) | 7.1(−9)(b) |
| SiS | 4.2(−6) | 3.0(−6) | 2.3(−5) | 2.9(−6)(1) |
| 29SiS | 1.7(−7)(a) | 1.9(−7) | 7.3(−7) | 1.7(−7)(b) |
| 30SiS | - | 3.9(−8)(a) | 5.0(−7) | 1.2(−7)(b) |
| Si34S | 8.2(−8)(a) | 1.1(−7) | 1.4(−7)(a) | 1.6(−7)(b) |
| SiC2 | 1.1(−6) | 8.0(−7) | 2.3(−6) | 3.6(−7)(2) |
| Si13CC | 2.5(−7)(a) | - | - | 8.0(−9)(c) |
| CS | 2.0(−5) | 1.9(−5) | 4.8(−6)(a) | 3.9(−6)(1) |
| 13CS | 1.3(−6) | 1.0(−7)(a) | 2.2(−7)(a) | 8.7(−8)(c) |
| C33S | 6.9(−8)(a) | 1.2(−8)(a) | 2.5(−8)(a) | 4.2(−8)(b) |
| C34S | 2.8(−7) | 2.1(−7) | 3.5(−7) | 2.0(−7)(b) |
| HCN | 1.0(−5) | 1.9(−5) | 3.1(−5) | 1.9(−5)(1) |
| H13CN | 6.6(−6) | 1.1(−6) | 7.7(−6) | 4.3(−7)(c) |
| CN | 8.5(−7)(a) | 1.0(−6)(a) | 5.9(−6)(a) | 1.8(−6)(3) |
| HNC | 2.3(−7) | 1.2(−7)(a) | 5.3(−7)(a) | 6.8(−8)(4) |
| HN13C | 4.6(−8)(a) | – | – | 1.6(−9)(c) |
| HC3N | 7.8(−7) | 7.4(−7) | 2.2(−6) | 7.1(−7)(3) |
| H13CCCN | 7.9(−8)(a) | 1.4(−8)(a) | 5.2(−8)(a) | 5.3(−9)(c) |
| HC13CCN | 8.0(−8)(a) | 1.4(−8)(a) | 4.5(−8)(a) | 5.3(−9)(c) |
| HCC13CN | 8.0(−8)(a) | 1.4(−8)(a) | 4.9(−8)(a) | 5.3(−9)(c) |
| H13C13CCN | 1.5(−8)(a) | – | – | – |
| H13CC13CN | 2.2(−8)(a) | – | – | – |
| HC13C13CN | 1.6(−8)(a) | – | – | – |
| C3N | 4.2(−7)(a) | 4.9(−7) | 6.3(−7) | 1.5(−7)(5) |
| CC13CN | 1.1(−7)(a) | – | – | 1.1(−9)(c) |
| HC5N | 2.3(−7)(a) | 8.7(−7) | 8.6(−7) | 2.1(−7)(5) |
| C2H | 2.7(−5) | 8.5(−6) | 3.1(−6)(a) | 1.3(−5)(6) |
| C3H | 5.7(−8)(a) | – | 3.2(−8)(a) | 2.2(−7)(d) |
| C4H | 3.6(−6) | 9.3(−7) | 4.2(−7) | 1.1(−6)(5) |
| 13CCCCH | 2.7(−7)(a) | – | – | 5.9(−9)(c) |
| C13CCCH | 3.1(−7)(a) | – | – | 5.9(−9)(c) |
| CC13CCH | 3.2(−7)(a) | – | – | 5.9(−9)(c) |
| CCC13CH | 2.8(−7)(a) | – | – | 5.9(−9)(c) |
| c-C3H2 | 1.8(−7)(a) | – | – | 5.6(−8)(5) |
Notes. a(b) corresponds to a × 10b. We estimate an uncertainty of a factor of three to five for the abundances estimated from population diagrams and an order of magnitude for single-line estimates (Sect. 4.5). (a)Abundances estimated from single lines. All other abundances (for the three stars in the sample) are from population diagrams. IRC +10216 abundances are from:(1) Agúndez et al. (2012), (2)Massalkhi et al. (2018),(3) Agundez (2009), (4)Daniel et al. (2012), (5)Gong et al. (2015), and (6)De Beck et al. (2012). (b)Calculated by scaling the abundances of the corresponding main isotopologue by the relevant isotopologue ratio from He et al. (2008).(c) Scaled from the corresponding 12C isotopologue using a 12C/13C ratio of 45 (Cernicharo et al. 2000). (d)Obtained by scaling the column density from Agundez (2009) by the fX/Ntot ratio of C2H, assuming C3H and C2H to be co-spatial.
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