Table 1.
He II ionizing rate in different types of objects coexisting in a superstar cluster older than ∼5 Myr.
| Object | Model( * ) | Temperature | log Q(He II) |
|---|---|---|---|
| [s−1] | |||
| WC star | WC 19-18 | T* = 200 kK | 48.5 |
| WNE star | WNE 18-13 | T* = 178 kK | 48.4 |
| SBB | apec | kT = 0.5 keV | 49.7 |
| SBB | apec | kT = 0.2 keV | 50.2 |
| SBB | apec | kT = 0.1 keV | 51.0 |
Notes. The metallicity Z = 0.07 Z⊙ is adopted. Numbers are given for an X-ray luminosity LX(0.3−10.0 keV) = 1040 erg s−1 of the superbubble (SBB). ( * )For WR stars, T* is the stellar temperature, and the model number is according to the model grid computed with the Potsdam Wolf-Rayet (PoWR) model atmsophere code accessible at www.astro.physik.uni-potsdam.de/PoWR.
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