Magnetically channeled wind-shock models are promising (q1Ori C, perhaps t
Sco): Schulz (2003) has shown that O stars have these X-ray signatures for less
than 1 million years on the main sequence
Normal B stars (like b
Cru, B0.5 IV and e CMa B2 II) have very soft X-ray
spectra and narrow lines: wind shocks if the X-ray wind isnŐt moving very fast?
Magnetically channeled wind shocks if the shocks arenŐt very strong? Dynamo-driven coronae if our
understanding of dynamos is incompleteÉ