A 5.57 hour modulation of the X-ray flux of 4U1822-37: A new model for CYG X-3

Details A 5.57 hour modulation of the X-ray flux of 4U1822-37: A new model for CYG X-3 A 5.57 hour modulation of the X-ray flux of 4U1822-37: A new model for CYG X-3

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8120001w&link_type=abstract

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Cygnus Constellation, Light Curve, Stellar Spectra, X Ray Sources, Binary Stars, Fourier Analysis, Heao 1, Heao 2, Stellar Occultation

Scientific paper

The X-ray flux of 4U1822-37 is shown to be modulated with the 5.57 hour period of its optical counterpart. The X-ray light curve is two component with a smooth sinusoidal like 25 percent semiamplitude modulation and a 30 minute dip approximately 0.2 in phase following the other minimum. The X-ray spectrum is a relatively flat power law up to 17 keV, above which its steepens. Iron emission is detected at 6.7 keV with a 4 keV FWHM and an equivalent width of 1100 eV. There is an excee below 2 keV that is consistent with either a 0.25 keV thermal component or 350 eV equivalent width iron L emission. A slight softening of the spectrum is seen during both X-ray minima. The dip is interpreted as the partial occultation of an extended cloud of optically thick highly ionized material surrounding the central X-ray source. Modeling the eclipse gives a system inclination of 70-79 deg and a spherical cloud radius of 0.2-0.3 solar radius. Models for the long term modulation are considered. The properties of this source are compared to those of Cyg X-3. It is concluded that they are similar systems.

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