Accretion onto selected magnetic white dwarfs as seen in X-rays

Details Accretion onto selected magnetic white dwarfs as seen in X-rays Accretion onto selected magnetic white dwarfs as seen in X-rays

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..309t&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 309-312 (2010).

Physics

White Dwarfs, Accretion Disks, Photosphere, X-Ray Binary Stars, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Accretion And Accretion Disks, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, X-Ray Binaries

Scientific paper

Magnetic cataclysmic variables of AM Her type comprise an accreting white dwarf with a strong magnetic field. Under its influence, the accretion stream is channeled along the field lines towards the poles of the white dwarf, preventing the formation of an accretion disk and allowing for direct insight into the accretion regions. Due to the high temperatures developing in the accretion process, a considerable fraction of the total emission is found at X-ray energies: hard X-ray emission from the material which is decelerated above the white-dwarf surface, and soft X-ray and FUV emission from the heated photosphere, where the hard emission is reprocessed. We perform dedicated XMM-Newton observations to study the spectral components, their flux contributions, and the physical structure of the accretion region of several AM Her systems selected by their distinct soft X-ray fluxes. Modeling the spectral signature of these system components involves approaches to the complex and still widely unknown temperature structure in accretion column and accretion region, which we approximate with multi-temperature white-dwarf and plasma models.

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