Computer Science
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt.........8p&link_type=abstract
Ph.D. Thesis Southampton Univ. (England).
Computer Science
1
Infrared Spectra, Ultraviolet Spectra, Visible Spectrum, X Ray Binaries, H Alpha Line, Iue, Pulse Modulation, Spectrum Analysis
Scientific paper
The subclass of galactic binary X-ray systems known as the Massive X-Ray Binaries (MXRB) was studied. One of the most striking properties peculiar to the MXRB is that they exhibit regular X-ray pulsations. The UV flux of three of these systems was examined to serach for modulations over intervals corresponding to the known X-ray pulse periods. The IUE satellite was used for this purpose; it was necessary to employ a special trailed observation mode in conjunction with specific data analysis techniques designed to optimize the sensitivity and temporal resolution available. These procedures are described in detail. The UV spectrum of the sources Vela X-1, A0535 + 26 amd 4U1145619 were sampled with resolution of approximately 1/10th of the respective pulse periods. Observations of the proposed counterparts of three hard X-ray transients are examined; it is shown that the most likely counterpart has a spectrum consistent with that of a Be star. The behavior of the H alpha emission is also found to be partly correlated with the IR decline; both are accounted for by the expulsion of a shell of material from the companion star. Finally the optical/IR counterpart of the EX02030 + 375 system is identified.
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