Absorption features: RBS 1223
(Haberl et al., 2003)
Eline » 0.3 keV ; s » 100
eV , EW » 150 eV Þ B » 5(1+z) x 1013 G
P = 10.3 s; cooling age » 5 x 105 yrs
dP/dt » P/2t » 3 x 10-13 s/s Þ Bdip » 6 x1013 G
ÿ B consistent with what is required for a
proton cyclotron line
ÿ Line parameters (EW, sigma) consistent
with models (Zane et al. 2001)