Towards a self-consistent description of accretion columns. III - Radiation pattern and computer-generated pictures of the emission region

Details Towards a self-consistent description of accretion columns. III - Radiation pattern and computer-generated pictures of the emission region Towards a self-consistent description of accretion columns. III - Radiation pattern and computer-generated pictures of the emission region

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223..246k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. 246-250. Research supported by DFG.

Statistics

Computation

4

Accretion Disks, Computational Astrophysics, Neutron Stars, Self Consistent Fields, Stellar Models, X Ray Binaries, Computer Graphics, Emission Spectra, Radiation Distribution, Stellar Radiation, Stellar Spectra

Scientific paper

Results are presented of modeling an accretion column on a highly magnetized neutron star. For two representative energies, the radiation pattern of the accretion column is discussed, computer-generated pictures of the region near an accreting pole are presented, and some typical pulse profiles are shown. As a consequence of the bulk motion of the infalling plasma, radiation emerging from the column is directed primarily downwards onto the neutron star. It is assumed that X-rays hitting the neutron star's surface are reprocessed (e.g., by electron scattering), and it is concluded that an accretion column is surrounded by a circular X-ray emitting halo. In both the pictures and the pulse profiles the importance of the halo contribution to the overall emission characteristics is apparent.

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