Other “extreme” hot stars
Wolf-Rayet stars: metal enriched, very evolved, extremely dense winds: are actually very weak X-ray sources, probably due to very large wind continuum opacity
h Carina: possibly the most luminous star in the galaxy: Chandra (Corcoran et al.) and XMM (Leutenegger et al.) grating spectroscopy:
central star has very hard emission;
lines are not very broad;
absorption and Fe fluorescence;
large f/i ratios.
Consistent with colliding wind binary X-ray emission