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EXOSAT observations of GH 2215^-086 : detection of the X-ray pulse period

Watson, M. G.; McHardy, I. M.; Cook, M. C.

A 2.8 hr observation of the intermediate polar H2215 - 086 using the Exosat Medium Energy experiment has revealed a strong, quasi-sinusoidal modulation of the hard X-ray flux with a period (20.65 + or - 0.32 min) consistent with, and in phase with, that of the large amplitude optical variations. The detection of this hard X-ray modulation confirms…

Spectral and temporal features in bursts from 2S 1636-536 observed with EXOSAT.

Turner, M. J. L.; Breedon, L. M.

The well-known X-ray burster 2S 1636-536 (Nor X-1) was observed for 7 hr by the ME instrument on EXOSAT. During this time 7 bursts of unusual shape were detected. The bursts have similar profiles. The results suggest that each burst has two components with an initial helium thermonuclear flash triggering a stronger hydrogen flash; the ratio of con…