Physics – Plasma Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8823704b&link_type=abstract
Unknown
Physics
Plasma Physics
Binary Stars, Spaceborne Astronomy, Stellar Spectra, White Dwarf Stars, X Ray Astronomy, Plasma Physics, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Mass Accretion, X Ray Spectra
Scientific paper
The X-ray observations with EINSTEIN, HEAO-1, and EXOSAT of AM Her binaries are discussed. The presence of a soft X-ray excess is established. Two-pole emission is observed in several systems. The near pole (as seen from the secondary) always emits X-rays when the system is active. The far pole emits only weak cyclotron radiation in some systems, but may become the dominant soft X-ray pole in others. The parameter which most directly determines the dominant energy loss mechanism is the specific accretion rate. The total accretion rate and its time structure may also play an important role. The plasma-physical processes in the magnetosphere which determine the density and ionization structure of the accretion stream are not well understood, such as what causes, e.g., the stream to subdivide into flows toward both poles of which one may be cyclotron dominated and the other soft X-ray dominated. More theoretical work is needed to better understand the interaction of the accretion stream with the magnetosphere and the plasma physics and radiative transfer in the accretion region on the white dwarf.
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