Free Access
Table 2
Possible steps in the physical processes of partial mixing and nuclear H- and He-burning in massive very low Z stars.
| Steps | Acting physical processes | Main nuclear products | Stars and properties |
|
|
|||
| 0 | Absence of mixing | Initial composition | Low Z stars without C excess |
| 0+ | Core H-burning | 13C, 14N | Very low CNO, but N > C, O |
| 1 | Core He-burning | 12C, 16O, no N | Visible only in WC stars |
| 1+ | Advanced He-burning | 12C ↘, 16O, low 20Ne | Visible only in WO stars |
| 2 | Partial mixing 12C, 16O in H-burning shell | 12C, 13C, 14N, 16O | CEMP-no with [C/N] > 0, [O/N] > 0 |
| 2+ | Idem with advanced H-burning | Idem | CEMP-no with [C/N] < 0, [O/N] < 0 |
| 2Na | Idem from 1+ with the Ne-Na cycle | Idem, 20,21,22Ne, 23Na | CEMP-no, [C/N] > 0, [O/N] > 0, Na |
| 2+Na | Idem 2Na, advanced H-burning | Idem, 20,21,22Ne, 23Na | CEMP-no, [C/N] < 0, [O/N] < 0, Na |
| 3 | Partial mixing prod. (2, 2+) in He-burn. zone | 18O, 22Ne | CEMP-no, N ↘, O-strong, 22Ne |
| 3+ | Idem with advanced α captures | O, 20,22Ne, 25,26Mg, Sr, Y | CEMP-no, idem, Mg, s-elem.(1st peak) |
| 3++ | Idem with more 22Ne (α,n)25Mg captures | Idem, Ba weak | Low s-star, Mg,s-el. (1st, 2nd peak) |
| The same above 3 cases from (2Na, 2Na+) | Same properties as in above cases | ||
| −→ cases 3Na, 3+Na, 3++Na | with Na present | ||
| 4 | Part. mix. 3 in H-burn., CNO, Ne-Na | CNO, Ne, Na, | CEMP-no, N↗, Ne, Na, |
| 4+ | Part. mix. 3+ in H-burn., CNO, Ne-Na, Mg-Al | CNO, Ne, Na, Mg, Al | CEMP-no, Na, Mg, Al, s-el.(1st peak) |
| 4++ | Partial mixing of 3++, idem | Idem | Low s, Na, Mg, Al, s-el.(1st, 2nd peak) |
Notes. He should be enriched in all cases, except for step number 0. See text for more details.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.