Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..806n&link_type=abstract
X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G
Other
2
Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, X-Ray Sources, X-Ray Bursts, Accretion And Accretion Disks, Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Cataclysmic Binaries, Symbiotic Stars, X-Ray Binaries
Scientific paper
The X-ray spin pulse profiles of fast rotating intermediate polars (Pspin<700 s) are double peaked, whilst those of slower rotating systems are not. We believe this is due to the lower magnetic field strength in the short spin period systems, so the radius at which material is captured by the field lines is relatively small. Consequently the footprints of the disc-fed accretion curtains on the white dwarf surface are large. The optical depths to X-ray emission within the accretion curtains are such that the emission from the two poles conspires to produce double-peaked X-ray pulse profiles. We emphasise, however, that a double-peaked pulse profile is not a unique indicator of two-pole accretion. Indeed, two-pole accretion onto smaller regions of the white dwarf surface may be considered the ``normal'' mode of behavior in a disc-fed intermediate polar with a longer white dwarf spin period, resulting in a single-peaked pulse profile. .
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