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EXOSAT observations of bursts from 2S1636-536: Burst morphology

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Abstract

In two observations with the EXOSAT ME a total of 11 bursts were detected; 7 in July and 4 in May 1984. In terms of rise time and peak count rate there are only 2 kinds, those with a sharp rise and peak count rate of 500 cts/sec/detector and those with a slow rise and a peak count rate of 200 cts/sec/detector. The spectral analysis of these bursts shows a similar situation: for the sharp bright bursts the black body radius increases rapidly to > 20 km and the temperature lags. For the slow dim bursts the temperature rises ahead of the black body radius expansion which is small and slow. The time t 1/2 at which half the total burst energy has been released is ∼3.5 seconds for bright bursts and ∼8 seconds for dim ones. These gross differences may be related to the predominance of helium or hydrogen in the thermonuclear flash.

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Authors and Affiliations

  1. X-ray Astronomy Group, Department of Physics, University of Leicester, LE1 7RH, Leicester

    M J L Turner, L M Breedon & T Ohashi

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  1. M J L Turner
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  2. L M Breedon
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  3. T Ohashi
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Turner, M.J.L., Breedon, L.M. & Ohashi, T. EXOSAT observations of bursts from 2S1636-536: Burst morphology. Space Sci Rev 40, 263–268 (1985). https://doi.org/10.1007/BF00212896

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