Other
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..994w&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, Aug. 1, 1981, p. 994-1002.
Other
80
Binary Stars, Blue Stars, Modulation, Stellar Radiation, X Ray Sources, Heao 1, Light Curve, Stellar Magnitude, X Ray Spectra
Scientific paper
The X-ray flux of 4U 1822-37 is shown to be modulated with the 5.57 hr period of its optical counterpart. The X-ray light curve is two component, with a smooth sinusoidal-like 25% semiamplitude modulation and a 30 minute dip of approximately 0.2 in phase following the other minimum; the dip center occurs 0.04 in phase after the optical minimum. The X-ray spectrum is a relatively flat power law up to 17 keV, above which it steepens; iron emission is detected at 6.7 keV with a 4 keV FWHM and an equivalent width of 1100 eV. An excess below 2 keV is consistent with either a 0.25 keV thermal component of 350 eV equivalent width iron L emission. Modeling the eclipse for a 0.5-0.7 solar radius companion 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, and a comparison of the properties of 4U 1822-37 with those of Cyg X-3 shows that they are similar systems.
Becker Robert H.
Boldt Elihu A.
Holt Stephen S.
Serlemitsos Peter J.
Swank Jean H.
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