Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..715h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 1, 1989, p. 715-732. Research supported by th
Astronomy and Astrophysics
Astronomy
72
Accretion Disks, Exosat Satellite, Light Curve, X Ray Binaries, X Ray Spectra, Binary Stars, Ephemerides, Spectrum Analysis, Stellar Mass
Scientific paper
Data from three Exosat observations have been used to model X1822-371 as an X-ray emitting accretion disk corona (ADC) which is partially obscured by an optically emitting disk whose height varies with azimuthal angle. Using a system inclination of 85 + or - 3 deg and a disk structure parameterized by as few as two straight lines, the model is able to reproduce simultaneously both the X-ray and optical light curves of the binary system. The results are used to obtain absolute sizes of the X-ray and optical emitting regions, and have determined that the 5.57-hr period of X1822-371 is increasing on a time scale of 1.8 x 10 to the 6th yr. It is suggested that the X-ray obscuring material within the disk does not lie at a similar radius to that of the X-ray emitting ADC, but instead lies at the outer edge of the accretion disk.
Hellier Coel
Mason Keith O.
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