Observational evidence for the binary model of X-ray bursters |
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| Authors: | S Bowyer J Clarke K Mason F Walter J Henry J Halpern J Grindlay |
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| Institution: | 1. Space Sciences Laboratory, University of California, Berkeley, USA;7. Institute of Astronomy, 2650, Woodlawn Road, Honolulu, HI, USA;71. Harvard-Smithsonian Center for Astrophysics, 60, Garden Street, Cambridge, MA, USA |
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| Abstract: | Most, but not all, theoretical models of X-ray bursters require a binary system consisting of a mass donating star and a neutron star. The observational evidence in support of this model, however, is both indirect and meager. We have detected absorption dips in the X-ray spectrum of the Burster MXB 1916-05 with the IPC and the MPC on the Einstein Observatory which occur with a binary period of 2985 seconds. These dips are shown to be the result of a gas stream emanating from a companion star and hence this data represents the first direct evidence of the binary nature of X-ray bursters. Detailed models of the interaction of the gas stream with the accretion disk are presented. A 22nd mag. optical candidate for the system has been found. |
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