Einstein observations of EF Eridani (2A 0311-227) - The textbook example of AM Herculis-type systems

Details Einstein observations of EF Eridani (2A 0311-227) - The textbook example of AM Herculis-type systems Einstein observations of EF Eridani (2A 0311-227) - The textbook example of AM Herculis-type systems

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..360b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 360-376.

Astronomy and Astrophysics

Astronomy

70

Stellar Oscillations, Stellar Spectra, White Dwarf Stars, X Ray Astronomy, X Ray Binaries, Cyclotron Radiation, Eclipsing Binary Stars, Heao 2, Light Curve, Stellar Atmospheres, Stellar Luminosity, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Orbits

Scientific paper

Hard and soft X-ray spectra of the AM Herculis star EF Eridani obtained with the Einstein Observatory are found to be fitted by a thermal bremsstrahlung spectrum with kT of about 20 keV, and a blackbody spectrum with kT of between 16 and about 33 eV, respectively. EF Eri is shown to behave almost exactly as predicted by simple theory, with its soft X-ray luminosity not exceeding the hard X-ray luminosity by more than a factor of three, and both spectra originating from the same active pole of the accreting white dwarf. The data are consistent with a model involving an accretion stream penetrating deep into the magnetosphere of the white dwarf, such that accretion occurs along nonpolar field lines, and an 'X-ray auroral oval' emission is formed on the surface of the white dwarf.

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