An EXOSAT observation of the peculiar X-ray binary 2S 0921-630 during optical eclipse |
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| Authors: | K O Mason F A Cordova R H D Corbet G Branduardi-Raymont |
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| Institution: | (1) Mullard Space Science Laboratory, Holmbury St.Mary, Dorking, Surrey, UK;(2) Present address: Los Alamos National Laboratory, MS D436, 87545 Los Alamos, NM, USA;(3) Present address: Department of Astrophysics, University of Oxford, South Parks Rd., OX1 3RQ Oxford |
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| Abstract: | An x-ray observation of 2S 0921-630 has been made coincident with the time of optical eclipse of this 9-day binary. No significant reduction in X-ray flux is measured. This can be explained if the binary orbit is viewed almost exactly edge-on, so that the central X-ray emitting star is obscured by the accretion disk from direct view. The X-rays that are seen are scattered into the line of sight by material above and below the disk and the apparent size of the X-ray emission region is thus large compared to the size of the occulting star. |
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