Pulsed phase spectroscopy
of proton cyclotron lines:
theory
1) Computing
atmospheric models at different magnetic co-latitudes
2) Assuming
surface temperature
profile and
B-field topology
3)
Ray-tracking in the strong gravitational field.
+
+
=
4) Predicting
spin variation
of the line
parameters!
GOAL: probe the surface properties of
the neutron star via pulse-phase spectroscopy of cyclotron absorption lines
q =
0š
q =
40š
q =
80š
Zane,
Turolla, Perna, Llyod, 2004 in prep.