Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-10-23
Astronomy and Astrophysics
Astrophysics
18 pages with 5 eps figures, accepted for publication in ApJ Replaced due to clerical error only: one more author, no new cont
Scientific paper
10.1086/303865
Using a Hartree-Fock formalism, we estimate energy levels and photon cross sections for atomic iron in magnetic fields B ~ 10^13 G. Computing ionization equilibrium and normal mode opacities with these data, we construct LTE neutron star model atmospheres at 5.5 < Log(T_eff) < 6.5 and compute emergent spectra. We examine the dependence of the emergent spectra on T_eff and B. We also show the spectral variation with the angle between the magnetic field and the atmosphere normal and describe the significant limb darkening in the X-ray band. These results are compared with recent detailed computations of neutron star H model atmospheres in high fields and with low field Fe and H model atmospheres constructed from detailed opacities. The large spectral differences for different surface compositions may be discernible with present X-ray data; we also note improvements needed to allow comparison of Fe models with high quality spectra.
Miller Michael Coleman
Rajagopal Mohan
Romani Roger W.
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