The EXO 0748-676: an exciting new X-ray transient

Details The EXO 0748-676: an exciting new X-ray transient The EXO 0748-676: an exciting new X-ray transient

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.236..119p&link_type=abstract

In ESA Recent Results on Cataclysmic Variables p 119-122 (SEE N86-20287 10-93)

Physics

3

Eclipsing Binary Stars, Exosat Satellite, Stellar Radiation, X Ray Sources, Accretion Disks, Light Curve, Periodic Variations, Stellar Spectra

Scientific paper

The results of EXOSAT observations of the X-ray transient EXO 0748-676 are presented. This source shows X-ray eclipses, irregular intensity dips, and X-ray bursts. The eclipses last for 8.3 min and recur with a period of 3.8 hr. The intensity dips occur between phases 0.5 and 0.1 (where center of eclipse is 0.0) and are associated with an increase in low energy absorption. As the intensity of EXO 0748-676 decayed by a factor 2 over an interval of 50 days the shape of the 2 to 10 keV light curve changed such that the dips were centered on phase 0.0. In addition to 18 single type 1 bursts, 3 double X-ray bursts are observed. The luminosity of the second burst in a pair is 0.3 of the first. The rise and decay times of the second bursts appear to be more rapid than the first bursts.

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