Cyclotron lines in accreting magnetic white dwarfs with an application to VV Puppis

Physics

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Cyclotron Radiation, Plasmas (Physics), Stellar Mass Accretion, White Dwarf Stars, Absorption, Astronomical Models, Binary Stars, Emission, Magnetic Stars

Scientific paper

Calculations of cyclotron line spectra for homogeneous plasmas are made for emission and absorption models. The theoretical spectra show that the visibility of cyclotron lines in the optical spectrum is limited to a small parameter space in magnetic field strength (2 - 10×107gauss), plasma temperature (⪉15 keV), and the accretion column nearly perpendicular to the line of sight for extended periods of time. These model spectra also confirm the conclusion by Wickramasinghe and Meggitt that the broad lines in VV Pup are due to cyclotron emission. The best fit to the data of VV Pup results in a polar magnetic field strength of B = 3.15×107 gauss, a postshock temperature kT = 8.7 keV, and dimensionless plasma parameter Λ ≈ 106.

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