Simultaneous ultraviolet and X-ray observations of the massive binary V861 Scorpii (=OAO 1653-40)?

Details Simultaneous ultraviolet and X-ray observations of the massive binary V861 Scorpii (=OAO 1653-40)? Simultaneous ultraviolet and X-ray observations of the massive binary V861 Scorpii (=OAO 1653-40)?

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l...7p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Oct. 1, 1979, p. L7-L11. Research supported by the Science Rese

Astronomy and Astrophysics

Astronomy

13

Binary Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, X Ray Sources, Black Holes (Astronomy), Light Curve, Satellite Observation, X Ray Irradiation

Scientific paper

Results are reported for simultaneous Copernicus UV and X-ray observations of the massive binary system V861 Sco (possibly associated with the X-ray source OAO 1653-40) over a period of five orbital cycles from April to September 1978. It is found that the UV spectrum of V861 Sco is similar to that of a normal supergiant and that the X-ray flux from OAO 1653-40 is highly variable. A simultaneous change in the C III 1176-A line and the 3.8-8.8-keV X-ray flux is discussed which was detected when V861 Sco was observed in September 1978. The close correlation between the X-ray and UV events is taken to imply that the X-ray source OAO 1653-40 is coincident with V861 Sco. The event energetics and physical conditions in the region responsible for the C III 1176-A emission are considered. It is concluded that the most likely X-ray production mechanism is accretion by a gas stream onto a black hole.

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