Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..603m&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 603-609. Research supported by the U.S. Department of Energy;
Astronomy and Astrophysics
Astrophysics
25
Binary Stars, Light Curve, Stellar Spectrophotometry, Ultraviolet Spectra, X Ray Sources, Emission Spectra, Iue, Line Spectra, Stellar Mass Accretion, Stellar Occultation
Scientific paper
It is suggested that the 5.57-hour modulation of the X-ray source 2A 1822-371 is caused by the combined effects of (1) an occultation of the emitting region by a companion star, and (2) a bulge on the accretion disk surrounding the X-ray source. It is speculated that the changing aspect of the X-ray-heated inner face of the bulge with orbital phase may also contribute to the modulation at UV and optical wavelengths. The bulge's position angle suggests it to have been the result of turbulence caused by the impact of a gas stream transferring matter from the companion, and 2A 1822-371 is held to provide the most direct indication extant of such a structure in an accretion disk. It is speculated that comparison of high-time resolution UV observations with optical and X-ray light curves will allow further deductions as to the size, structure and location of the far-UV emitting region.
Cordova France A.
Mason Keith O.
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