Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989xras.rept...28r&link_type=abstract
In its Contributions of the X Ray Astronomy Group of the Max-Planck-Institut für Extraterrestrische Physik p 28-32 (SEE N90-2419
Astronomy and Astrophysics
Astronomy
Binary Stars, Light Curve, Pulse Duration, X Ray Stars, European Space Programs, Exosat Satellite, Pulse Rate, X Ray Astronomy, X Ray Spectra
Scientific paper
The 283 second pulse profile of Vela X-1 and its dependence on spin and orbital phase and energy are investigated. Low and medium energy data from EXOSAT observatory are analyzed. Pulsed emission was found down to the lowest energy measurable (0.7 to 2 keV). A pulse phase analysis showed that the pulse profiles are independent of the orbital phase and on time scales larger than 4 hours. It is shown that the five low energy peaks evolve gradually out of the double peak structure at high energies and that the transition occur in the 6 to 20 keV range. Comparison with existing models led to conclude that the neutron star is a near-orthogonal rotator with the magnetic axis close to the line of sight and that the x rays must be produced in slightly asymmetric accretion columns at the magnetic poles. These columns consist of cold, highly magnetized plasma. The energy region in which the pulse shape transformation took place indicate a magnetic field of 2-5 x 1012 G.
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