Open Access
Table 1.
Notation definitions.
| Symbol | Definition |
|---|---|
 |
Minimum luminosity above which a stellar model is classified as a WN star (see Sect. 2.2) |
 |
Minimum luminosity above which a stellar model is classified as a WC star (see Sect. 2.2) |
 |
Minimum luminosity at which a WC is produced by winds in our evolutionary calculations |
 |
Minimum luminosity at which a WO is produced by winds in our evolutionary calculations |
| ttotal | Total lifetime of a helium star from core helium ignition to core collapse |
| tHe − N | Lifetime of a helium star spent with an outer helium-nitrogen shell |
| tHe − C | Lifetime of a helium star spent with an outer helium-carbon shell |
| tHe − O | Lifetime of a helium star spent with oxygen surface abundance higher than 0.05 after core helium depletion |
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.