Table 1
Chemical composition of the secondaries on the zero-age main sequence (ZAMS; abundance distribution from Asplund et al. 2009, scaled to Z = 10-4) and of the ejecta from the AGB models of Lugaro et al. (2012).
| Model | tmt (Gyr) | Mass fraction | Mass fraction × 10-6 | Abundance | Mean mol. weight | |||||||||
|
|
||||||||||||||
| H | 4He | 3He | C | N | O | Ne | Mg | Si | Fe | [Fe/H] | [C/Fe] | |||
| ZAMS | ... | 0.75770 | 0.24217 | 30.30 | 17.72 | 5.190 | 42.95 | 9.390 | 5.300 | 4.980 | 9.680 | − 2.14 | 0.00 | 0.5934 |
| Composition of AGB ejecta | ||||||||||||||
| 0.90M⊙ | 9.10 | 0.73302 | 0.26222 | 235.8 | 3680 | 135.1 | 217.5 | 457.0 | 12.77 | 4.943 | 8.895 | − 2.16 | 2.35 | 0.6046 |
| 1.00M⊙ | 6.30 | 0.74907 | 0.24956 | 261.4 | 933.0 | 21.47 | 92.47 | 37.29 | 5.395 | 4.913 | 8.910 | − 2.17 | 1.76 | 0.5972 |
| 1.25M⊙ | 3.06 | 0.71670 | 0.27604 | 228.9 | 6032 | 42.42 | 305.3 | 620.9 | 14.96 | 4.976 | 8.869 | − 2.15 | 2.57 | 0.6122 |
| 1.50M⊙ | 1.80 | 0.69878 | 0.28562 | 203.7 | 12840 | 56.60 | 590.2 | 1854 | 40.11 | 5.121 | 8.821 | − 2.14 | 2.90 | 0.6212 |
Notes. The second column lists the age when accretion of the corresponding composition begins (tmt). Mass fractions of all elements other than helium are sums over their isotopes.
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