Multiple X-ray bursts and the model of a spreading layer of accreting matter over the neutron star surface |
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| Authors: | Email author" target="_blank">S?A?GrebenevEmail author I?V?Chelovekov |
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| Institution: | 1.Space Research Institute,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | We report the detection of series of close type I X-ray bursts consisting of two or three events with a recurrence time much shorter than the characteristic (at the observed mean accretion rate) time of matter accumulation needed for a thermonuclear explosion to be initiated on the neutron star surface during the JEM-X/INTEGRAL observations of several X-ray bursters. We show that such series of bursts are naturally explained in the model of a spreading layer of accreting matter over the neutron star surface in the case of a sufficiently high (? ? 1 × 10?9 M ⊙ yr?1) accretion rate (corresponding to a mean luminosity L tot ? 1 × 1037erg s?1). The existence of triple bursts requires some refinement of the model—the importance of a central ring zone is shown. In the standard model of a spreading layer no infall of matter in this zone is believed to occur. |
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