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 O star’s lines are Doppler broadened
Þ Unlike in cool stars, x-ray emission in hot stars has something to do with these stars’ stellar winds
The
shapes of these broadened
lines tells us about
the kinematics and
spatial distribution of
the x-ray emitting plasma