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…