Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..595r&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 595-599 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
Light Curve, Pulsed Radiation, Stellar Spectra, X Ray Astronomy, X Ray Binaries, Neutron Stars, Pulse Duration, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Models
Scientific paper
By using the low energy and medium energy data from the EXOSAT observatory the investigation of the 283 second pulse profile of Vela X-1 in its dependence on spin and orbital phase as well as energy are performed. Pulsed emission was found down to the lowest energy measureable. 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 models led to the conclusion 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. A magnetic field of (2 to 5) x 10 12 G is found.
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