Differences in the line shapes become
apparent when we look at a
single line (here Ne X, Lya)
zPup
(O4 I)
Capella (G2 III)
The
x-ray emission lines in the hot
star z Pup are
broad -- the wind shock scenario is looking good!
But
note, the line isn’t just broad,
it’s also blueshifted and
asymmetric…