Table 5
Derived dust-to-gas mass ratio as a function of radius in the dust formation zone of IRC+10216.
| r (R⋆) | 1.2 | 1.5 | 2 | 2.5 | 3 | 4 | 5 |
|
|
|||||||
| n(gas)a | 3.65(13) | 8.20(12) | 1.43(12) | 4.22(11) | 1.66(11) | 4.47(10) | 1.74(10) |
| x(C2H2) | 1.65( − 4) | 1.53( − 4) | 1.51( − 4) | 1.20( − 4) | 1.16( − 4) | 1.18( − 4) | 1.20( − 4) |
| x(C6H6) | 1.05( − 13) | 4.38( − 11) | 9.70( − 8) | 9.10( − 7) | 1.31( − 6) | 2.45( − 7) | 6.25( − 8) |
| Ntot(C2H2) | 5.04(51) | 3.43(51) | 1.74(51) | 8.52(50) | 5.76(50) | 3.82(50) | 2.98(50) |
| Ntot(C6H6) | 3.21(42) | 9.81(44) | 1.12(48) | 6.46(48) | 6.50(48) | 7.94(47) | 1.55(47) |
| Y(C6H6) | 0 | 0 | 0.2% | 2.7% | 3.38% | 0.6% | 0.1% |
| m(C24H12)a | 1.60(21) | 4.89(23) | 5.56(26) | 3.22(27) | 3.24(27) | 3.95(26) | 7.73(25) |
| Ngrowth(C2H2) | 2.89(43) | 8.83(45) | 1.01(49) | 5.81(49) | 5.85(49) | 7.14(48) | 1.40(48) |
| Ngrowth(C2H2)/Ntot(C2H2) | 0% | 0.0003% | 0.58% | 6.83% | 10.16% | 1.87% | 0.47% |
| m(AC dust)a | 1.60(21) | 4.89(23) | 5.56(26) | 3.22(27) | 3.24(27) | 3.95(26) | 7.73(25) |
| m(dust)/m(gas)b | 1.30 × 10-5 | 1.22 × 10-4 | 1.75 × 10-4 | 3.28 × 10-5 | 8.37 × 10-6 | ||
Notes. We list the pre-shock gas number density, acetylene and benzene abundances, the total number of C2H2 and C6H6 molecules, the C6H6 yield ( ≡ number of C atoms initially in C2H2 locked into C6H6), the mass of coronene C24H12, the total number of C2H2 molecules depleted in the growth from C6H6 to C24H12, the corresponding number fraction of C2H2 depleted in the growth from C6H6 to C24H12 in %, and the mass of AC dust formed (see text for detail). The region of efficient AC dust formation corresponds to numbers in boldface.
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