An 81 minute modulation of the X-ray flux from 2A 0311-227

Details An 81 minute modulation of the X-ray flux from 2A 0311-227 An 81 minute modulation of the X-ray flux from 2A 0311-227

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l..85w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Mar. 1, 1981, p. L85-L88.

Astronomy and Astrophysics

Astrophysics

30

Binary Stars, Magnetic Stars, Periodic Variations, Stellar Spectra, White Dwarf Stars, X Ray Sources, Absorption Spectra, Emission Spectra, Heao 1, Heao 2, Infrared Radiation, Linear Polarization, Stellar Mass Accretion, X Ray Absorption

Scientific paper

It is demonstrated that the X-ray flux from 2A 0311-227 is modulated at the 81 minute orbital period of its optical counterpart. An absorption dip with NH approximately equal to 5 x 10 to the 22nd H atoms per sq cm is observed at magnetic phase 0.42 that is interpreted as the accretion column of a magnetic white dwarf passing in front of the X-ray source. The spectrum is thermal with a temperature of 18 keV and a 300 eV equivalent-width iron line at 6.6 keV.

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