Table 2
CNO surface composition values and quotients at selected times along the evolution of our model stars.
| At end of SDU/DO |
| MZAMS/M⊙ | X(C) | X(N) | X(O) | X(C + N + O) | C/O | N/O | ||
|
|
||||||||
| 4.0 | 5.8 × 10-7 | 3.1 × 10-6 | 3.9 × 10-6 | 7.6 × 10-6 | 0.20 | 0.91 | ||
| 5.0 | 5.3 × 10-7 | 3.5 × 10-6 | 3.4 × 10-6 | 7.4 × 10-6 | 0.20 | 1.18 | ||
| 6.0 | 4.9 × 10-7 | 3.8 × 10-6 | 3.1 × 10-6 | 7.4 × 10-6 | 0.21 | 1.40 | ||
| 7.0 | 4.1 × 10-6 | 4.0 × 10-6 | 3.1 × 10-6 | 1.1 × 10-5 | 1.72 | 1.72 | ||
| 8.0 | 2.7 × 10-5 | 9.0 × 10-4 | 8.2 × 10-5 | 1.0 × 10-3 | 0.44 | 12.54 | ||
| 9.0 | 1.6 × 10-3 | 6.5 × 10-5 | 2.8 × 10-4 | 2.0 × 10-3 | 5.71 | 0.23 | ||
|
|
||||||||
| At maximum Xsurf(C) |
| MZAMS/M⊙ | stage | X(C) | X(N) | X(O) | X(C + N + O) | C/O | N/O | |
|
|
||||||||
| 4.0 | 12th TP | 6.7 × 10-4 | 1.8 × 10-4 | 1.3 × 10-5 | 8.6 × 10-4 | 69.0 | 15.8 | |
| 5.0 | 13th TP | 2.5 × 10-4 | 8.3 × 10-5 | 6.9 × 10-6 | 3.4 × 10-4 | 48.0 | 13.7 | |
| 6.0 | 13th TP | 3.9 × 10-5 | 7.9 × 10-6 | 3.6 × 10-6 | 5.1 × 10-5 | 14.4 | 2.51 | |
| 7.0 | SDU | 4.2 × 10-6 | 3.9 × 10-6 | 3.0 × 10-6 | 1.1 × 10-5 | 1.72 | 1.72 | |
| 8.0 | SDU | 8.5 × 10-4 | 4.3 × 10-6 | 8.0 × 10-5 | 9.3 × 10-4 | 26.4 | 0.06 | |
| 9.0 | DO | 1.7 × 10-3 | 1.2 × 10-4 | 4.0 × 10-4 | 2.2 × 10-3 | 4.25 | 0.30 | |
|
|
||||||||
| After 20 TPs |
| MZAMS/M⊙ | X(C) | X(N) | X(O) | X(C + N + O) | C/O | N/O | ||
|
|
||||||||
| 4.0 | 3.2 × 10-4 | 2.7 × 10-3 | 2.7 × 10-5 | 3.0 × 10-3 | 15.7 | 111.8 | ||
| 5.0 | 1.5 × 10-4 | 1.2 × 10-3 | 1.4 × 10-5 | 1.4 × 10-3 | 13.9 | 99.0 | ||
| 6.0 | 4.9 × 10-5 | 3.7 × 10-4 | 4.3 × 10-6 | 4.2 × 10-4 | 15.0 | 96.9 | ||
| 7.0 | 3.8 × 10-7 | 1.1 × 10-5 | 6.0 × 10-8 | 1.2 × 10-5 | 8.4 | 7.2 | ||
| 8.0 | 3.4 × 10-5 | 1.0 × 10-3 | 5.3 × 10-5 | 1.1 × 10-3 | 0.9 | 21.7 | ||
| 9.0 | 5.3 × 10-4 | 1.6 × 10-3 | 4.1 × 10-4 | 2.5 × 10-3 | 1.7 | 4.4 | ||
|
|
||||||||
| At end of calculations |
| MZAMS/M⊙ | X(C) | X(N) | X(O) | X(C + N + O) | C/O | N/O | ||
|
|
||||||||
| 4.0 | 2.3 × 10-3 | 4.4 × 10-2 | 4.0 × 10-4 | 4.7 × 10-2 | 7.7 | 125.7 | ||
| 5.0 | 2.8 × 10-3 | 4.1 × 10-2 | 3.8 × 10-4 | 4.4 × 10-2 | 9.6 | 123.3 | ||
| 6.0 | 2.0 × 10-3 | 3.0 × 10-2 | 2.7 × 10-4 | 3.2 × 10-2 | 10.2 | 131.0 | ||
| 7.0 | 1.3 × 10-3 | 1.7 × 10-2 | 1.9 × 10-4 | 1.9 × 10-2 | 9.4 | 100.0 | ||
| 8.0 | 7.4 × 10-4 | 6.3 × 10-3 | 7.5 × 10-5 | 7.1 × 10-3 | 13.2 | 96.0 | ||
| 9.0 | 1.2 × 10-4 | 2.3 × 10-3 | 9.5 × 10-5 | 2.5 × 10-3 | 1.7 | 27.7 | ||
Notes. Values are given at the end of the second dredge-up or dredge-out episode, at the time when surface carbon abundance reaches its maximum value, at the 20th thermal pulse of the TP-(S)AGB phase and at the end of our calculations. For the maximum Xsurf(C) entries the column labelled “stage” tells when this maximum is reached.
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