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.
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+
=
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.